1 1 Embedded FM/TV Antenna System Final Report Prepared for By January 21, 2011
2 2 Table of Contents 1 Introduction Technical Specification Prototype Antenna FASTROAD Active module fabrication Demonstration Board Design Measured Data VHF1/VHF2 Tuning Data VHF1/VHF2 Radiation Pattern Measurement UHF Radiation Pattern Measurement Peak Gain Data Antenna integration design guidelines Control signals for fastroad antenna operation Receiver sensitivity measurements Typical project plan and target cost Summary Appendix A Appendix B... 46
3 3 List of Figures Figure 1. NAB FASTROAD embedded antenna topology... 8 Figure 2. NAB FASTROAD embedded antenna control schematic... 8 Figure 3. Control schematic for FASTROAD active tunable module... 9 Figure 4. FASTROAD prototype module; top (left) and bottom (right) sides of module are shown Figure 5. Demonstration board containing FASTROAD prototype active, tunable module; top (left) and bottom (right) sides of the demonstration board are shown Figure 6. Demonstration board containing the FASTROAD module and antenna element connected to a network analyzer Figure 7. Tuning data for the VHF1 tuning circuit in the FASTROAD module Figure 8. Tuning data for the VHF2 tuning circuit in the FASTROAD module Figure 9. Spectrum analyzer Figure 10. Antenna under test on turntable Figure 11. Ferrite loaded choke Figure 12. Reference dipole Figure 13. Orientation Figure 14. Orientation Figure 15. Orientation Figure 16. FASTROAD demonstration board mounted in anechoic chamber Figure 17. Coordinate system for all radiation pattern measurements, VHF1, VHF2, and UHF. 21 Figure 18. Measured peak gain of FASTROAD active tunable antenna at VHF1 band compared to simulated peak gain of 6 inch external whip antenna Figure 19. Measured peak gain of FASTROAD active tunable antenna at VHF2 band compared to simulated peak gain of 6 inch external whip antenna Figure 20. Measured peak gain of FASTROAD active tunable antenna at UHF band compared to simulated peak gain of 6 inch external whip antenna Figure 21. Photograph of FASTROAD ATM Figure 22. Photograph of FASTROAD antenna element Figure 23. PCB pad layout for FASTROAD ATM Figure 24. Mobile TV circuit board prior to modification Figure 25. FASTROAD ATM installed in TV Figure 26. Transmit antenna Figure 27. ATSC transmitter installed in computer Figure 28. Data sheet for Dektec DTA-115 ATSC transmitter Figure 29. Screen shot of program used to control ATSC transmitter Figure 30. Baseline mobile TV in anechoic Chamber during test Figure 31. Modified mobile TV in anechoic chamber during test Figure 32. Baseline whip position Figure 33. Modified TV with paddle stowed Figure 34. Measured comparison receiver sensitivity at VHF Figure 35. Measured comparison receiver sensitivity at VHF Figure 36. Measured comparison receiver sensitivity at UHF Figure 37. 2D radiation patterns at 89 MHz; scale is in dbi... 40
4 4 Figure 38. 2D radiation patterns at 96 MHz; scale is in dbi Figure 39. 2D radiation patterns at 105 MHz; scale is in dbi Figure 40. 2D radiation patterns at 175 MHz; scale is in dbi Figure 41. 2D radiation patterns at 183 MHz; scale is in dbi Figure 42. 2D radiation patterns at 196 MHz; scale is in dbi Figure 43. 3D radiation pattern at 470 MHz Figure 44. 3D radiation pattern at 585 MHz Figure 45. 3D radiation pattern at 695 MHz Figure 46. 2D radiation patterns at 470 MHz; scale is in dbi Figure 47. 2D radiation patterns at 585 MHz; scale is in dbi Figure 48. 2D radiation patterns at 695 MHz; scale is in dbi... 49
5 5 1 INTRODUCTION The purpose of the Embedded FM/TV Antenna System Project is to research, specify, prototype, and test a tri-band embedded antenna capable of servicing mobile DTV and FM radio antenna requirements in a mobile, handheld device. This work, being conducted for the National Association of Broadcasters (NAB) under the FASTROAD technology advocacy program, is intended to hasten development of key embedded antenna technology which in turn could help remove roadblocks related to the inclusion of FM radio and mobile DTV in mobile handsets and other portable devices. This Final Report provides measured performance data on the prototype FASTROAD antenna developed during this project. The goal of this report is to provide a specification for an antenna for FM radio and mobile DTV applications, along with a high level design of the antenna. This report was preceded by two reports, a Milestone 1 Report (dated May 3, 2010) which included a review of antenna system capabilities and performance, and a Milestone 2 Report (dated June 1, 2010) which included a technical specification and proposed antenna design for an embedded FM/TV antenna system for mobile applications. The measured antenna data in this report shows that the active tunable antenna approach selected for this project is providing the required antenna performance required for mobile DTV and FM applications.
6 6 2 TECHNICAL SPECIFICATION Specifications for an antenna for mobile DTV and FM radio applications were presented in the Milestone 2 Report and are repeated here. Electrical Specification: Band Frequency (MHz) 1 db Bandwidth VSWR Output Impedance (Ohms) Polarization VHF MHz, MHz Linear 400 khz, MHz VHF MHz Linear UHF MHz Linear Control Signals: Supply voltage 3V Band select signal 0 to 3V 3 band select signals required Tuning voltage 0 to 3V 1 tuning voltage required Current consumption 10 ma max Antenna Gain Specification: Band Frequency (MHz) Average Gain (dbi) Minimum across band VHF VHF UHF Mechanical: Dimensions (Length x Width x Height) max Weight (gm) 48 mm x 16 mm x 4 mm TBD
7 7 3 PROTOTYPE ANTENNA The FASTROAD prototype antenna consists of a two piece design: an active, tunable module along with an antenna element. During development of the prototype active antenna it was determined that a tuning circuit was not required for the UHF band. The tuning circuit was replaced with a passive matching circuit for UHF to simplify the circuit and for future cost reduction. The active tunable module topology is shown in Figure 1. The active, tunable module contains a pair of 3-port switches with three tuning or matching circuits between the switches to tune the individual frequency bands. A low noise amplifier (LNA) is connected to the output of the second switch and provides a nominal 15dB of gain across the 50 to 700 MHz frequency range. The VHF1 and VHF2 tuning circuits each consist of a varactor diode and two high Q inductors. The values of the inductors are optimized per band to provide a high Q tunable circuit for impedance matching the common antenna element. When integrated into a production mobile device the tuning circuits can be controlled via a lookup table residing in the firmware of the processor used to control the mobile DTV receiver chipset. Using varactor diodes in the tuning circuits for the variable capacitance, a variable DC voltage can be used to optimize the frequency response of the tuning circuit at a specific channel. Alternately, a pulse width modulated (PWM) signal can be used to simulate the analog tuning voltage required to select the frequency of operation of the antenna. The control schematic for the FASTROAD active tunable module is shown in Figure 2. A more detailed schematic defining the pad layout for the active tunable module is shown in Figure 3. A single antenna element was designed and optimized for the active, tunable circuit and connects to the input port of the active, tunable module. The antenna element is an inductively loaded monopole structure. This unbalanced structure has two advantages over a balanced antenna such as a loop: 1) the monopole structure presents a high impedance which minimizes coupling of noise and transient responses in the near field of the mobile device and 2) the monopole structure coupled to the tuning circuits provides a wider bandwidth tuned frequency response compared to a loop. Inductive loading of the monopole element improves antenna performance at VHF1 and VHF2 by increasing the electrical length of the radiator. For test and evaluation of the FASTROAD antenna a demonstration board was developed that simulates the width and length of a typical handset or smart phone. The demonstration board is 50mm by 100mm and contains a battery for powering the active module along with a DIP switch and potentiometer to switch bands and tune the antenna response. The active, tunable module is re-flow soldered to the demonstration board.
8 8 Antenna element Tuning module Tuning Circuit 1: MHz Low Noise Amplifier Switch Tuning Circuit 2: MHz Switch Matching Circuit 3: MHz Figure 1. NAB FASTROAD embedded antenna topology Radiating element Antenna tuning module Antenna VHF1/VHF2 tuning voltage Supply voltage 3V Freq band select 0 or 3V Receiver Figure 2. NAB FASTROAD embedded antenna control schematic
9 9 Figure 3. Control schematic for FASTROAD active tunable module
10 10 4 FASTROAD ACTIVE MODULE FABRICATION The FASTROAD active, tunable circuit developed for this project is fabricated as a module that can be re-flow soldered to the circuit board of the host device, such as a handset, net book, or other mobile device. The fabrication method chosen was to design and fabricate a two layer printed circuit board (PCB) using standard FR4 substrate. Discrete components comprising the active circuit were mounted on this PCB, using standard manufacturing guidelines in regards to component spacing and circuit board trace dimensions. The components are mounted on the top side of the PCB and ten (10) mounting pads are designed into the bottom side of the PCB to provide connection to the host device PCB; these ten pads provide RF input and output connections, RF and DC ground, and control and supply voltage connections. The PCB contains the attach pads for a shield can, which is attached to the PCB after discrete component placement. The PCB, discrete components, and shield can comprise the FASTROAD active, tunable module. The module, when assembled in this fashion, is ready for SMT (surface mount technology) onto the PCB of the host device in a high volume production setting. The module is 11mm wide, 15.5mm in length, and a height of 3.5mm with shield can attached. A photograph of the FASTROAD module is shown in Figure 4. In the photograph, both the top and bottom sides of the module are shown. The shield can is not shown in this photograph. On the top side of the module (component side), the ten plated pads are for shield can attachment by soldering. On the bottom side of the module, the ten attach pads are shown for connection of the module to the PCB of the host device. These ten pads correspond to the ten control lines shown in Figure 3. Figure 4. FASTROAD prototype module; top (left) and bottom (right) sides of module are shown
11 11 5 DEMONSTRATION BOARD DESIGN To provide for test and evaluation of the FASTROAD active, tunable antenna a demonstration board was designed and fabricated (Figure 5). The purpose of the demonstration board is twofold: 1) Provide power and control signals to the active, tunable module 2) Provide a ground plane to simulate the circuit board of the host device A 50mm wide and 100mm length circuit board dimension was chosen to represent a typical handset sized mobile device. A two layer PCB was designed and fabricated for the demonstration board. The demonstration board contains a battery holder and two size AAA batteries, a 4 position DIP switch, a potentiometer, a SMA RF connector, and an etched antenna element. The DIP switch controls the pair of 3-port switches which are used to switch in one of three tuning or matching circuits. Table 1 shows the settings for the four DIP switch positions to select one of the three frequency bands. The potentiometer is used to provide a DC voltage to the two varactor diodes, one located in the VHF1 and VHF2 tuning circuits. Rotating the potentiometer knob will vary the DC voltage to the varactor diodes, which will cause a change in capacitance of the varactor diode which will in turn change the impedance of the tuning circuit. The tuning circuits are optimized to impedance match each of the three frequency bands. Band DIP Switch 1 - Vcc 2 UHF 3 VHF2 4 VHF1 VHF1 ON OFF OFF ON VHF2 ON OFF ON OFF UHF ON ON OFF OFF Table 1. DIP switch settings to select a specific frequency band
12 12 Antenna element FASTROAD module DIP switch potentiometer SMA connector Battery holder with AAA batteries Figure 5. Demonstration board containing FASTROAD prototype active, tunable module; top (left) and bottom (right) sides of the demonstration board are shown
13 13 6 MEASURED DATA 6.1 VHF1/VHF2 Tuning Data The FASTROAD active tunable antenna, comprised of a module and antenna element, is an active receive-only antenna. As such, a direct measure of input antenna impedance is not feasible. A method for characterizing the tuning circuits is to conduct an S12 transmission measurement, where a signal is radiated by an antenna and the FASTROAD active tunable antenna is used to receive the signal. A two port network analyzer is applicable for this measurement. A two port network analyzer allows for the measure of four S-parameters: S11, S12, S21, and S22. The first number in the S-parameter denotes the port that the signal is received from while the second number denotes the port that the signal is transmitted from. Since we are concerned with measuring the performance of a received signal through the receive-only active antenna, an S12 measurement can be conducted where a transmit antenna is connected to port 2 and the active receive-only antenna is connected to port 1. This will provide a radiated signal from port 2 and will allow for a signal to be received and measured at port 1. During this test the bandpass characteristics and tuning range of the tunable matching circuits can be measured. This measurement was conducted on the demonstration board containing the FASTROAD active module and antenna element. The test procedure is as follows: 1. Connect a transmit antenna to port 2 of a two port network analyzer. 2. Connect the LNA output of the demonstration board to be tested to port 1 of the network analyzer. 3. Set the network analyzer to the S12 measurement mode. 4. Set the start and stop frequencies to cover the frequency range of interest. To test VHF1 set the start frequency to 50 MHz and the stop frequency to 120 MHz. 5. To test VHF1 set the DIP switch on the demonstration board to the VHF1 setting (DIP switch settings shown in Table 1). The trace on the network analyzer will show the receive response of the FASTROAD active tunable antenna. The potentiometer can be adjusted and the change in frequency response can be viewed. 6. To test VHF2 set the start frequency to 160 MHz and the stop frequency to 240 MHz. and repeat step 5, changing the DIP switch settings to the VHF2 state. Figure 6 shows a photograph of the demonstration board containing the FASTROAD module and antenna element connected to port 1 of the network analyzer and a wire antenna connected to port 2. Figures 7 and 8 show measured S12 transmission measurements of the demonstration board. The different color traces represent several potentiometer settings, each potentiometer setting providing a specific DC voltage to the varactor diode in the tuning circuit to adjust the capacitance, which in turn adjusts the impedance of the matching circuit to optimize the antenna impedance. As can be seen from the plots the tunable circuits provide the required minimum 6 MHz bandwidth for each of the tuning states. Only four states are shown for VHF1 and three states for VHF2. The potentiometer provides for continuous adjustment so the antenna
14 14 impedance can be optimized for all channels in each frequency band. The UHF frequency band did not require a tunable circuit due to the antenna element being more appropriately sized at this higher frequency range. Figure 6. Demonstration board containing the FASTROAD module and antenna element connected to a network analyzer
15 15 Figure 7. Tuning data for the VHF1 tuning circuit in the FASTROAD module Figure 8. Tuning data for the VHF2 tuning circuit in the FASTROAD module
16 VHF1/VHF2 Radiation Pattern Measurement Measuring radiation patterns and peak gain at commercial VHF frequencies poses a challenge because of the low frequencies involved. Traditionally, low frequency antenna pattern measurements have been conducted on outdoor ranges to accommodate the long wavelengths involved. Indoor anechoic far field chambers are sized according to the wavelength that the test is to be conducted at. Typically an anechoic chamber designed for far field measurements needs to have physical dimensions on the order of 10 wavelengths for length, width, and height, or greater if possible. The absorbing material used to suppress reflections from the walls of the chamber need to be on the order of one wavelength or greater to provide the necessary attenuation and scattering of the incident wave. These dimensional constraints make anechoic chambers unrealistic for use in the 50 to 150 MHz. frequency range. Outdoor ranges are available for low frequency test but can not operate at the FM and VHF TV frequency bands due to interference concerns. Even if temporary waivers are obtained to transmit in these frequency ranges, the low power level constraints will result in the commercial transmit channels in the FM and TV bands interfering with the intended test frequency. For radiation pattern testing at the VHF1 and VHF2 bands we used a simple technique to solve this dilemma. A spectrum analyzer and receive antenna were set up outdoors and used to survey the existing commercial signals in the FM and VHF frequency bands. These channels were measured for signal strength and stability to determine the usefulness as test signals to measure radiation patterns. Multiple FM and VHF TV channels were determined to be strong enough and stable for use as test signals. Six frequencies were chosen: 89.5, 96.5, 105.3, 175, 183, and 196 MHz. Radiation patterns were measured on the FASTROAD active tunable antenna at the VHF1 and VHF2 frequency bands at the six test frequencies using a spectrum analyzer, shown in Figure 9 connected to the antenna under test to receive the commercial signals. The antenna under test was positioned on a turntable that provided continuous rotation and is shown in Figure 10. A ferrite loaded choke, shown in Figure 11 was used to de-couple the antenna under test from the coaxial cable used to connect the antenna to the spectrum analyzer. The antenna under test was positioned and measured in three orientations: 1. Demonstration board positioned vertically 2. Demonstration board positioned horizontally, with the PCB normal to the incident signal 3. Demonstration board positioned horizontally, with the PCB in the plane of the incident signal The three orientations are shown in Figures 13, 14, and 15.
17 17 An adjustable dipole was used as a reference antenna and is shown in Figure 12. A gain calibration table for the reference dipole provided the peak gain which was used to provide a measure of absolute gain for the antenna under test. Radiation patterns at the six VHF1 and VHF2 test frequencies are shown in Appendix A. Figure 9. Spectrum analyzer Figure 10. Antenna under test on turntable
20 20 Figure 15. Orientation UHF Radiation Pattern Measurement Radiation patterns and peak gain measurements at the UHF band which covers 470 to 698 MHz. were conducted in an anechoic chamber (Figure 16). Ethertronics operates two anechoic chambers capable of antenna pattern measurements down to 400 MHz. These far field chambers provide the ability to rotate the antenna under test in both azimuth and elevation (Figure 17), allowing for a full 3D radiation pattern set. Radiation patterns were measured between 470 and 785 MHz at 5 MHz intervals, for a total of 64 frequencies. 2D and 3D radiation patterns are shown for three frequencies, 470, 585, and 695 MHz, in Appendix B.
21 21 Z Figure 16. FASTROAD demonstration board mounted in anechoic chamber Y Figure 17. Coordinate system for all radiation pattern measurements, VHF1, VHF2, and UHF
22 22 7 PEAK GAIN DATA Peak gain data was derived from the radiation pattern measurements conducted at the various test frequencies. The peak gain at three VHF1 frequencies, three VHF2 frequencies, and eleven UHF frequencies are shown in Figures 18, 19, and 20 respectively. The peak gain of the FASTROAD active tunable antenna is compared to the simulated gain of a 6 inch external whip antenna, which was previously shown in the FASTROAD Milestone 2 Report. The peak gain measured on the FASTROAD active tunable antenna shows that the active tunable approach chosen for this application is working quite well. The peak gain at the FM frequency band as well as the UHF frequency band is equal to or greater than the gain achieved from a 6 inch whip at a majority of the frequency range, with the performance at VHF2 (170 to 240 MHz) is within 5 db of the performance of the whip. It is important to note that the simulated gain for the external whip does not includes conductor or mismatch losses; the actual measured peak gain for the external whip will be lower. Table 2 provides measured peak gain as well as standard deviation data for the frequencies tested. The peak gain in Table 2 are the data points shown in Figures 18, 19, and 20 and represent the maximum gain for the three principal planes measured: XY, XZ, and YZ. The standard deviation is calculated for the XY plane only, since this is the one plane that the antenna can have an omni-directional radiation pattern due to symmetry of the antenna configuration tested. The XZ and YZ planes will contain nulls or pattern minima in the radiation pattern. As can be seen, the standard deviation is quite small at the UHF frequencies and increases as the frequency of operation is decreased. This is due to two factors: 1) the difficulty of de-coupling the antenna and ground plane from the test cable and 2) the reflections due to the outdoor environment at the VHF1 and VHF2 frequency bands. The UHF patterns were measured in an anechoic chamber, which provides a more stable and near reflection-free environment.
23 23 Figure 18. Measured peak gain of FASTROAD active tunable antenna at VHF1 band compared to simulated peak gain of 6 inch external whip antenna Figure 19. Measured peak gain of FASTROAD active tunable antenna at VHF2 band compared to simulated peak gain of 6 inch external whip antenna
24 24 Figure 20. Measured peak gain of FASTROAD active tunable antenna at UHF band compared to simulated peak gain of 6 inch external whip antenna Frequency, MHz Peak gain, dbi Std. Dev., XY Plane Table 2. Measured peak gain and standard deviation of prototype FASTROAD antenna
25 25 8 ANTENNA INTEGRATION DESIGN GUIDELINES When integrated into a production mobile device, control voltages will need to be provided to switch frequency bands and tune to a specific channel. The tuning circuits can be controlled via a lookup table residing in the firmware of the processor used to control the mobile DTV receiver chipset. A variable DC voltage is used to optimize the frequency response of the tuning circuit at a specific channel. Alternately, a pulse width modulated (PWM) signal can be used to simulate the analog tuning voltage required to select the frequency of operation of the antenna. The FASTROAD antenna has been designed for ease of integration into a wide variety of mobile wireless devices. The FASTROAD prototype active tuning module (ATM, shown in Figure 21) is designed to be capable of pick and place attachment to a PCB and re-flow soldered. This SMT (Surface Mount Technology) design makes it cost effective in a high volume production environment. A specific pad layout is required on the PCB of the host device. The required pad layout is shown in Figure 23. The single antenna element developed for the FASTROAD demonstration board (shown in Figure 22) can be directly designed onto the host circuit board as long as some simple design guidelines are followed. Alternately, a custom antenna can be designed for a specific mobile device form factor. A custom antenna design will typically more efficiently utilize the internal volume of the mobile wireless device. To design in the antenna element developed for the FASTROAD demonstration board, the following design guidelines should be observed for optimal antenna performance: 1. A 50 mm by 17 mm area allocated for antenna placement 2. The antenna area is located at one end of the circuit board, with the antenna element parallel to the edge of the circuit board 3. Complete ground plane removal for all layers of the circuit board in the antenna area 4. No components placed within the antenna area For some antenna applications for mobile devices the area requirements for the antenna element from the FASTROAD will be too restrictive. In these cases a custom antenna element can be designed. The only requirement for use of a custom antenna with the FASTROAD ATM is that the antenna element be designed to have a 500 nh reactance. This will provide the reactance required for the tuning circuits within the ATM to impedance match the antenna across the frequency bands.
26 26 Figure 21. Photograph of FASTROAD ATM Figure 22. Photograph of FASTROAD antenna element
27 27 Figure 23. PCB pad layout for FASTROAD ATM
28 28 9 CONTROL SIGNALS FOR FASTROAD ANTENNA OPERATION Ten (10) pads etched onto the bottom side of the FASTROAD ATM provides a method of connecting the ATM to the circuit board of the host device and provide connections for supply and control voltages, as well as antenna connection and RF connection to the receiver chipset. The function of the ten (10) pads is listed in Figure 23. When integrated into a production mobile device the FASTROAD antenna can be controlled via a look-up table residing in the firmware of the processor used to control the mobile DTV receiver chipset. A sample look-up table is shown in Table 3. V cc, V1, V2, and V3 control signals remain as shown in this look-up table for all mobile devices. Tuning voltage V t is optimized for a specific mobile device and antenna element design. Table 3. Sample look-up table for control of the FASTROAD ATM
29 29 10 RECEIVER SENSITIVITY MEASUREMENTS The FASTROAD Embedded FM/TV Antenna System Project has resulted in the design of a tunable, active antenna that utilizes a single antenna element. The antenna gain performance across the frequency bands of interest has been measured and reported in Sections 6 and 7 of this Report. The most important parameter for an active receive antenna is sensitivity. The sensitivity of the active antenna solution can only be measured when the antenna is integrated into the mobile wireless device along with the receiver. This main parameter will vary from one mobile wireless device to the next and will be dependent on parameters such as internal noise characteristics of the mobile device. The FASTROAD antenna has been designed to reduce the effects of internal system noise by providing a bandwidth limited antenna response and by designing an antenna element that is more immune to near field signals. To complete the characterization of the FASTROAD antenna, two commercially available ATSC mobile TVs were procured, with one TV modified by installing the FASTROAD ATM and the other TV un-modified and used as a baseline TV. The ATSC mobile TVs used for sensitivity testing have a 7 inch color display and use an external 10.5 inch whip antenna to receive the TV signals. The external whip retracts into a 2.5 inch long plastic paddle which folds into the body of the mobile TV when placed in the stowed position. A simple coil antenna was fabricated that fit within the plastic paddle for use with the FASTROAD ATM installed in the mobile TV. The coil antenna is shown in Figure 28along with the rotating mechanism that is used to attach to the circuit board of the mobile TV. The paddle was placed in the stowed position to approximate an internal antenna. Figure 24 shows the mobile TV circuit board prior to installing the FASTROAD ATM. Figure 25 shows the FASTROAD ATM installed on the mobile TV circuit board. The ATM is placed upside down to allow for access to the control and ground pads. The black coaxial cable shown in Figure 25 was installed to connect the output of the ATM to the ATSC receiver. Figure 26 shows the transmit antenna used to transmit the ATSC channel during test. A DTA- 115 transmitter manufactured by Dektec was used to generate the ATSC test signal and is shown in Figure 27. The DTA-115 is a circuit card that is installed in a computer. The DTA-115 generates test signals at all ATSC channels, covering the VHF1, VHF2, and UHF frequency bands. Figure 29 is a screen shot of the program used to control ATSC transmitter. Figure 30 is a photograph of the baseline mobile TV installed in the anechoic chamber, while Figure 31 shows the mobile TV modified to include the FASTROAD ATM and antenna element. The sensitivity test consisted of placing the baseline TV in a shielded anechoic chamber to isolate the TV from external signals. The transmit antenna was positioned at one end of the chamber and the Dektec ATSC transmitter was connected to the transmit antenna. With the TV under test and the Dektec transmitter both set to the first test channel, the transmit power of the Dektec transmitter was reduced in 0.5 db steps until the picture quality of the received test signal started to degrade. A camera system installed in the anechoic chamber allowed for the viewing of the test video on the TV under test. The transmit power level was documented and the test then repeated using the mobile TV modified with the FASTROAD ATM and antenna element. The transmit power levels for the baseline and modified TVs were compared and the difference
30 30 in dbs were calculated. This difference in transmit power level is the difference in receiver sensitivity for the two mobile TVs. The baseline TV was tested with the external whip extended as shown in Figure 32. The TV modified with the FASTROAD ATM was tested with the plastic paddle containing the antenna element stowed as shown in Figure 33. Figure 34, Figure 35, and Figure 36 show plots comparing receiver sensitivity between FASTROAD antenna and external whip. The plots show the difference in receiver sensitivity in db between the FASTROAD ATM and coil antenna installed in the paddle of the TV in the stowed position, simulating an internal antenna, and the external 10.5 inch whip. As can be seen in the plots the receiver sensitivity with the FASTROAD antenna is within 4.5 db of the receiver sensitivity of the 10.5 inch external whip. The FASTROAD antenna provides improvement in receiver sensitivity of 1.5 db at the upper channels of all three frequency bands. This initial integration and test of an internal ATSC antenna is not optimized, since an internal antenna was not considered during product design. This initial integration and test does show the potential for quality TV reception at the low frequencies associated with ATSC applications. It is also important to keep in mind that smaller mobile devices envision for use with ATSC will include smart-phones, which may be limited to a shorter external whip, which will reduce receiver sensitivity. Figure 24. Mobile TV circuit board prior to modification
31 31 Figure 25. FASTROAD ATM installed in TV Figure 26. Transmit antenna
32 32 Figure 27. ATSC transmitter installed in computer Figure 28. Data sheet for Dektec DTA-115 ATSC transmitter
33 33 Figure 29. Screen shot of program used to control ATSC transmitter Figure 30. Baseline mobile TV in anechoic Chamber during test
34 34 Figure 31. Modified mobile TV in anechoic chamber during test Figure 32. Baseline whip position
35 35 Figure 33. Modified TV with paddle stowed Figure 34. Measured comparison receiver sensitivity at VHF1
36 36 Sensitivity Comparison Between FASTROAD Active Antenna and 10.5 inch External Whip in Mobile TV 15 Relative Sensitivity (db) Frequency (MHz) Figure 35. Measured comparison receiver sensitivity at VHF2 Figure 36. Measured comparison receiver sensitivity at UHF
37 37 11 TYPICAL PROJECT PLAN AND TARGET COST Due to the wide frequency bandwidth required for this low frequency requirement, a customized antenna element will typically needed when integrating the FASTROAD antenna solution into a mobile device. A sample project plan for designing in the FASTROAD antenna into a production device is as follows: FASTROAD Antenna Design In and Test 1. Review mobile device 3D CAD drawing package to determine optimal antenna location. Work with project engineering to determine acceptable locations for FASTROAD ATM and antenna element. 2. Select best antenna location available. This location will have volume available for the antenna element, PCB area close to antenna element feed point for ATM placement, and PCB routing area for control, supply, and RF transmission lines. 3. Wireless device PCB is designed with the layout required to accept the FASTROAD ATM. The antenna element is designed into the PCB or volume for a 3-dimensional coil element is allocated and features are designed into the mobile device to captivate and support the antenna element. 4. Prototype mobile device is fabricated and the FASTROAD ATM is soldered to the PCB. 5. Testing is conducted to verify proper supply voltage and control signals are available at ATM pads. 6. Receiver sensitivity measurements are conducted in a shielded enclosure to determine that the FASTROAD antenna has adequate sensitivity. The sensitivity criteria will typically be a comparison with an external whip antenna. FASTROAD Antenna Target Cost The FASTROAD antenna was developed to be a cost effective, internal antenna solution for ATSC and FM radio applications in mobile devices. The ATM (Antenna Tuning Module) is a standard active module that can be mass produced and used in a wide variety of mobile wireless devices. Component type, along with module construction was chosen with cost in mind. A cost estimate for volume manufacturing of the FASTROAD ATM in quantities of 200K or higher is $1.85. A breakdown is shown below. Line Item Notes Cost ($) Components LNA, switches, varactors, passives 1.20 PCB and shield can Part cost 0.35 Assembly SMT mounting of components and 0.20 shield can Test Electrical test 0.10 Total cost 1.85 Table 2. Cost estimate for FASTROAD ATM
38 38 The antenna element used in conjunction with the FASTROAD ATM can vary in cost from $0.00 (simple trace etched on PCB of host device) to approximately $0.40 for a 3 dimensional coil fabricated out of wire.
39 39 12 SUMMARY The FASTROAD active tunable antenna has been prototyped and tested and the results show that the antenna is capable of providing good antenna gain performance across the three designated frequency bands. The technique of using a single common antenna element and driving it with multiple tuning circuits and a common LNA has proven to be a viable solution for an internal antenna for mobile FM and DTV applications. The antenna form factor is small enough to be integrated into a wide variety of mobile devices.
40 40 13 APPENDIX A XY XZ YZ Figure 37. 2D radiation patterns at 89 MHz; scale is in dbi
41 41 XY XZ YZ Figure 38. 2D radiation patterns at 96 MHz; scale is in dbi
42 42 XY XZ YZ Figure 39. 2D radiation patterns at 105 MHz; scale is in dbi
43 43 XY XZ YZ Figure 40. 2D radiation patterns at 175 MHz; scale is in dbi
44 44 XY XZ YZ Figure 41. 2D radiation patterns at 183 MHz; scale is in dbi
45 45 XY XZ YZ Figure 42. 2D radiation patterns at 196 MHz; scale is in dbi
46 46 14 APPENDIX B Figure 43. 3D radiation pattern at 470 MHz Figure 44. 3D radiation pattern at 585 MHz Figure 45. 3D radiation pattern at 695 MHz
47 47-90 o -60 o -120 o 180 o 0 o 0 db -30 o o o 0 db 150 o 60 o 120 o 90 o XY -90 o -60 o -120 o 180 o 0 o 0 db -30 o o o 0 db 150 o 60 o 120 o 90 o XZ -90 o -60 o -120 o 180 o 0 o 0 db -30 o o o 0 db 150 o 60 o 120 o 90 o YZ Figure 46. 2D radiation patterns at 470 MHz; scale is in dbi
48 48-90 o -60 o -120 o 180 o 0 o 8 db 6-30 o 4 30 o o 8 db 150 o 60 o 120 o 90 o XY -90 o -60 o -120 o 180 o 0 o 8 db 6-30 o 4 30 o o 8 db 150 o 60 o 120 o 90 o XZ -90 o -60 o -120 o 180 o 0 o 8 db 6-30 o 4 30 o o 8 db 150 o 60 o 120 o 90 o YZ Figure 47. 2D radiation patterns at 585 MHz; scale is in dbi
49 49-90 o -60 o -120 o 180 o 0 o 12 db -30 o o o 12 db 150 o 60 o 120 o 90 o XY -90 o -60 o -120 o 180 o 0 o 12 db -30 o o o 12 db 150 o 60 o 120 o 90 o XZ -90 o -60 o -120 o -30 o 0 o 12 db o o 12 db 150 o 60 o 120 o 90 o YZ Figure 48. 2D radiation patterns at 695 MHz; scale is in dbi
Broadcast Antenna for Handsets Final Report Executive Summary December 15th, 2010 Michael Lukin email@example.com The Technology Partnership plc +44 1763 262626 www.ttp.com 1 project objectives The
VISHAY VITRAMON Multilayer Chip Capacitors Application Note GENERAL is a multilayer ceramic chip antenna designed for receiving mobile digital TV transmissions in the UHF band. The target application for
Printed Omni Directional Wi-Fi Antenna for 5.6 GHz Dragoslav Dobričić, YU1AW firstname.lastname@example.org Why printed antenna? Building antenna on SHF is associated with problems of manufacturing its parts with
Methods for Embedding DTV antennas into Notebook PC enclosures 1 Introduction This report summarizes the non proprietary results of an R&D project funded by NAB and directed by an engineering team at Dell.
Page (1) of (16) Abracon Drawing # 453782 Revision #: Revision A Source Control Drawing Part Description: Customer Part Number: Abracon Part Number: AMCA Series Multilayer Chip Antenna Application Note
Antenna Trainer EAN Technical Teaching Equipment Products Products range Units 3.-Communications INTRODUCTION Antennas are the main element of aerial communications. They are the transition between a transmission
Fractus BAR mxtend TM Antenna Booster A standard antenna solution for mobile frequency bands GSM850, GSM900, GSM1800/DCS, GSM1900/PCS, UMTS LTE700, LTE800, LTE850, LTE900, LTE1700, LTE1800, LTE1900, LTE2000,
Radiated Efficiency: A True Measure of Antenna Performance by Jouni Lifländer, RF Designer, Pulse Finland Oy An antenna is an electrical component that is needed to transmit and receive electromagnetic
CUBE mxtend TM (FR01-S4-250) AN for 2G/3G/4G Handsets 824-960 MHz and 1710-2690 MHz Fractus Antennas specializes in enabling effective mobile communications. Using Fractus Antennas technology, we design
APPLICATION NOTE Features AT09567: ISM Band PCB Antenna Reference Design Atmel Wireless Compact PCB antennas for 915MHz and 2.4GHz ISM bands Easy to integrate Altium design files and gerber files Return
Antennas and Propagation : Antenna Parameters Introduction Purpose Introduce standard terms and definitions for antennas Need a common language to specify performance Two types of parameters 1. Radiation
Amplifier for Small Magnetic and Electric Wideband Receiving Antennas (model AAA-1B) 1. Description and Specifications Contents 1.1 Description 1.2 1.2 Specifications 1.3 1.3 Tested parameters in production
ANTENNAS FOR LOW POWER APPLICATIONS By Kent Smith Introduction: There seems to be little information on compact antenna design for the low power wireless field. Good antenna design is required to realize
Low Power RF Designs Layout Review Techniques Suyash Jain FAE Training Oslo January 2011 1 Abstract The presentation provides guidelines and a checklist to copy TI reference designs for optimum performance.
Selecting Receiving Antennas for Radio Tracking Larry B Kuechle, Advanced Telemetry Systems, Inc. Isanti, Minnesota 55040 email@example.com The receiving antenna is an integral part of any radio location
Sheet Code RFi0612 White Paper 5W X-Band GaN Power Amplifier Using a Commercially Available Discrete Plastic Packaged SMT Transistor This paper describes the design of a single stage 5W X-Band GaN Power
EMC STANDARDS The EMC standards that a particular electronic product must meet depend on the product application (commercial or military) and the country in which the product is to be used. These EMC regulatory
11/21/11 Tuning a Monopole Antenna Using a Network Analyzer Chris Leonard Executive Summary: When designing a monopole antenna it is important to know at which frequency the antenna will be operating at.
An octave bandwidth dipole antenna Abstract: Achieving wideband performance from resonant structures is challenging because their radiation properties and impedance characteristics are usually sensitive
Turbo X 594 channel UHF true diversity The new Turbo X series from Smart Wireless is the culmination of two years of research and development into advanced wireless technology. Using sophisticated RF design
Antenna Properties and their impact on Wireless System Performance Dr. Steven R. Best Cushcraft Corporation 48 Perimeter Road Manchester, NH 03013 Phone (603) 627-7877 FAX: (603) 627-1764 Email: firstname.lastname@example.org
MASTER ANTENNA TELEVISION SYSTEM AND SATELLITE SYSTEM 01 General The MATV/FTV and Satellite System shall receive and distribute all Free to Air Television Channels, for analogue and Digital TV s; including
Printed Dipole Antenna Reto Zingg Abstract In this project a printed dipole antenna is being designed. Printed dipole antennas are of interest, when an electronic product, which is implemented on a printed
T9 / R9 Long Range RF Modules Features FM Narrow Band Crystal Stabilised Range up to 1,000 Metres 868MHz / 433MHz Versions 4 channel versions 434.075MHz 433.920MHz 434.225MHz 434.525MHz Miniature SIL Package
Application Note: Mobile bands in handsets and in modules with Fractus BAR mxtend TM Antenna Booster Single input/output port to provide multi-band operation (824-960 MHz and 1710-2170 MHz) GSM850, GSM900,
BAR mxtend TM AN for 2G/3G/4G Handsets (BAR mxtend). 698-798 MHz or 824-960 MHz or 1710-2690 MHz Fractus Antennas specializes in enabling effective mobile communications. Using Fractus Antennas technology,
Digital Active Indoor Antenna SRT ANT 10 ECO Picture similar User Manual Table of contents 1.0 INTRODUCTION 1 2.0 PACKAGE CONTENT 1 3.0 SAFETY NOTES 2 4.0 CONNECTING THE ANTENNA 2 1.0 INTRODUCTION Thank
RX-FM4SF 433,92 MHz The super-heterodyne FM receiver RX-FM4SF with High sensitivity and selectivity. It is equipped by front-end SAW filter that allows an High noise immunity. Enable pin allows to reach
Deutsche TV Platform Minimum requirements for DVB-T receiving antennas for portable indoor and portable outdoor reception compiled by Working Group: DVB-T launch (a working group of the Deutsche TV Platform)
Germanium Diode AM Radio LAB 3 3.1 Introduction In this laboratory exercise you will build a germanium diode based AM (Medium Wave) radio. Earliest radios used simple diode detector circuits. The diodes
ANTENNA An antenna is a device to transmit and/or receive electromagnetic waves. Electromagnetic waves are often referred to as radio waves. Most antennas are resonant devices, which operate efficiently
Basic Wire Antennas Part II: Loops and Verticals A loop antenna is composed of a single loop of wire, greater than a half wavelength long. The loop does not have to be any particular shape. RF power can
Audio quality without any compromise Reference audio with ultra linear frequency response Diversity Receiver with two matched antennas ensures reliable transmission Stable signal due to a new reference
Experiment 7: Familiarization with the Network Analyzer Measurements to characterize networks at high frequencies (RF and microwave frequencies) are usually done in terms of scattering parameters (S parameters).
BAR mxtend TM (FR01-S4-232) AN for 2G/3G/4G Handsets 824-960 MHz and 1710-2170 MHz Fractus Antennas specializes in enabling effective mobile communications. Using Fractus Antennas technology, we design
VJ 64 UHF Chip Antenna for Mobile Devices VJ 64 The company s products are covered by one or more of the following: WO2862 (A1), US2833 (A1), US283575 (A1), WO281173 (A1). Other patents pending. DESCRIPTION
Assembly Instructions: Shortwave Radio Kit MTM Scientific, Inc P.O. Box 522 Clinton, MI 49236 U.S.A Introduction Fig 1: The assembled Shortwave Radio Kit The SHORTWAVE RADIO KIT (#SWRAD) from MTM Scientific
VCO Phase noise Characterizing Phase Noise The term phase noise is widely used for describing short term random frequency fluctuations of a signal. Frequency stability is a measure of the degree to which
Antennas A good antenna works A bad antenna is a waste of time & money Antenna systems can be very inexpensive and simple They can also be very, very expensive Antenna Considerations The space available
BAR mxtend TM (FR01-S4-232) AN for 2G/3G/4G Handsets 698-798 MHz or 824-960 MHz or 1710-2690 MHz Fractus Antennas specializes in enabling effective mobile communications. Using Fractus Antennas technology,
Avaya WLAN 9100 External Antennas for use with the WAO-9122 Access Point Overview To optimize the overall performance of a WLAN in an outdoor deployment it is important to understand how to maximize coverage
AVX EMI SOLUTIONS Ron Demcko, Fellow of AVX Corporation Chris Mello, Principal Engineer, AVX Corporation Brian Ward, Business Manager, AVX Corporation Abstract EMC compatibility is becoming a key design
Cellular Wireless Antennas A Technical Brief GarrettCom Inc., November 2010 Overview The Cellular Wireless Antenna Technical brief is provided to assist with the design and deployment of the DX940 Cellular
1 Introduction The H20, H10, H5 and E5 are magnetic field (H) and electric field (E) probes for radiated emissions EMC precompliance measurements. The probes are used in the near field of sources of electromagnetic
RX-AM4SF Receiver The super-heterodyne receiver RX-AM4SF can provide a RSSI output indicating the amplitude of the received signal: this output can be used to create a field-strength meter capable to indicate
EM Noise Mitigation in Circuit Boards and Cavities Faculty (UMD): Omar M. Ramahi, Neil Goldsman and John Rodgers Visiting Professors (Finland): Fad Seydou Graduate Students (UMD): Xin Wu, Lin Li, Baharak
How to make a Quick Turn PCB that modern RF parts will actually fit on! By: Steve Hageman www.analoghome.com I like to use those low cost, no frills or Bare Bones  type of PCB for prototyping as they
Why is impedance matching important: In general sputtering or etching applications, power generators are used to transfer either DC, Medium Frequency (typically in the several khz range) or RF (usually
Constructing and Using Chokes The first installment of this series introduced basic antenna modeling and demonstrated the generation and control of feed line currents. The control of the feed line currents
Application Note: Spread Spectrum Oscillators Reduce EMI for High Speed Digital Systems Introduction to Electro-magnetic Interference Design engineers seek to minimize harmful interference between components,
WIRELESS INNOVATIONS COMPANY Application Note Integration and Soldering Guidelines M1575HCT-22-P Tuning Kit Maxtena Proprietary Information, Version 1.2, Revised 09/13 This document applies to the following
SPECIFICATION Patent Pending Part No. : PA.7. A Viking Product Name : Wide-Band LTE/Cellular/CDMA SMD Antenna For all in one 2G/3G/4G applications worldwide LTE/GSM / CDMA / DCS / PCS / WCDMA / UMTS /HSDPA
1 Introduction The H20, H10, H5 and E5 are magnetic field (H) and electric field (E) probes for radiated emissions EMC precompliance measurements. The probes are used in the near field of sources of electromagnetic
How to Simplify the Addition of Wireless Connectivity to Your Embedded Design Wireless connectivity continues to expand quickly across all industries as wider varieties of electronic devices and appliances
Design and Certification of ASH Radio Systems for Japan RFM s second-generation ASH radio hybrids are being used in a wide variety of applications in Japan, operating under the Japanese BIJAKU radio regulations.
Antenna Selection for Optimum Wireless LAN Performance Dr. Steven R. Best Cushcraft Corporation 48 Perimeter Road Manchester, NH 03108 (603) 627-7877 PURPOSE Overview of antenna properties and performance
Connectivity in a Wireless World Cables Connectors 204 A Special Supplement to Signal Launch Methods for RF/Microwave PCBs John Coonrod Rogers Corp., Chandler, AZ COAX CABLE MICROSTRIP TRANSMISSION LINE
'' EGGBEATER '' ANTENNA VHF/UHF ~ PART 2 ON6WG / F5VIF Summary Note : In Part 1, Fig 1 shows a maximum gain of 6.45 dbi. Several design attempts were made using slightly different configurations ( i.e.
S-Band Low Noise Amplifier Using the ATF-10136 Application Note G004 Introduction This application note documents the results of using the ATF-10136 in low noise amplifier applications at S band. The ATF-10136
Evaluating Cell Phone and Personal Communications Equipment and their EMC Effects on Automotive Audio and In-Cabin Modules Craig W. Fanning Elite Electronic Engineering, Inc. 1516 Centre Circle Downers
ANTENNA PRODUCTS GPS Active Antenna (1*1*7 mm) 2008, June Rev.2 (1*1*7 mm) CAN 18618 1B 1 GPS ACTIVE ANTENNA FOR GLOBAL POSITIONING SYSTEMS (1.7G Hz) Product Specification Ceramic Patch Antenna Outline
Antennas for EMC Testing Zhong Chen ETS-Lindgren 1301 Arrow Point Drive Cedar Park, TX 78613 Zhong.Chen@ets-lindgren.com Outline EMC Terms and Definitions Typical EMC Antennas Calibration of EMC Antennas
Current Probes User Manual ETS-Lindgren L.P. reserves the right to make changes to any product described herein in order to improve function, design, or for any other reason. Nothing contained herein shall
Features Miniature SIL package Fully shielded Data rates up to 128kbits/sec Range up to 300 metres Single supply voltage Industry pin compatible T5-434 Temp range -20 C to +55 C No adjustable components
PGA103+ Low noise, high dynamic range preamp for VHF and UHF By Sam Jewell, G4DDK and Kent Britain, WA5VJB Introduction This paper describes a low noise, high dynamic range VHF/UHF preamp that uses the
A Shunt Fixture for Low Impedance Measurements Sam Wetterlin 4/28/11 Introduction Measurements of impedances in the 0.01-10 ohm range are useful for measuring the resistance of capacitors, inductors and
Capacitor Self-Resonance By: Dr. Mike Blewett University of Surrey United Kingdom Objective This Experiment will demonstrate some of the limitations of capacitors when used in Radio Frequency circuits.
SUSCEPTIBILITY MODELING ANALYSIS of PARASITICS IN UNSHIELDED PRODUCTS with LONG WIRES ATTACHED Bruce Archambeault SETH Corporation Johnstown, PA H. Stephen Berger Siemens ROLM Communications Inc. Austin,
The VHF / UHF «Eggbeater» Antenna ~ Revisited ~ ON6WG / F5VIF A new simple way to build the Eggbeater Antenna Introduction Previous designs described in «VHF / UHF «Eggbeater» Antenna ~ Part 1» and «VHF
1 ELEMENTS OF CABLE TELEVISION Introduction Cable television, from its inception, developed in western countries into two separate systems called Master Antenna Television (MATV) and Community Cable Television
Mutual Inductance Matching for Small Loop Antennas by Alan Bensky Loop antennas are one of the most popular and widespread antenna types for small wireless products, particularly those operating in UHF
Digital TV Antennas Matchmaster premium UHF antennas are suitable for metropolitan & rural areas using UHF broadcasts. Heavy duty construction with F type baluns to improve signal quality. Various models