Polarisation is the orientation of the electric field vector component of the electromagnetic field.

Transcription

1 vehicle ANtennas

2 Definition of technical parameters Antenna describes how much power is transmitted in the direction of peak radiation compared with that of a reference antenna, usually expressed as dbi. A gain of 2dBi means that the power received far from the antenna will be 2dB higher than that received from a lossless isotropic antenna with the same input power. (Voltage Standing Wave Ratio) is a measure of how much power is delivered to an antenna and how much is reflected due to the mismatch between the antenna input impedance and the characteristic impedance of the transmission line. is a real number 1, a of 1:1 describes a matched antenna Bandwidth Antenna Bandwidth defines the range of frequencies over which the antenna can operate effectively. Bandwidth is typically quoted in terms of, for example, an antenna may be described as having a bandwidth of MHz with a <2.5. polarisation is the orientation of the electric field vector component of the electromagnetic field. Polar pattern A Polar Pattern is a 2-dimensional cut through a 3-dimensional pattern, usually in either the horizontal or vertical plane. A directional antenna will have a major lobe centred about the direction of peak gain, as well as back and side lobes. Parameters such as the 3dB beamwidth and front-to-back ratio can be derived from the polar pattern. Reciprocity The properties of an antenna are constant, regardless of whether it is used for transmitting or receiving. 2

3 From our UK based sites, SELEX Communications, part of the global aerospace and defence Finmeccanica group, has a long and successful history of designing and manufacturing high performance antennas for vehiclebased applications. software. This produces very accurate predictions of antenna performance when installed on a variety of platforms. Parameters that can be analysed include interference with co-located antennas, EMC and Radhaz (for the human, fuel and ordnance) Given the very demanding environments in which our products are used, our vehicle antennas are designed to provide optimum levels of electrical, mechanical and environmental reliability and performance. The products shown in this brochure illustrate the range of vehicle antennas we offer. We are also very experienced in working with customers to develop programme-specific antenna solutions. These could include other system components such as filters, couplers and splitters/ combiners. Our capabilities include a very powerful computer modelling and simulation suite using the latest state-of-the-art 3

4 4 VHF Wideband Monopole Antenna P MHz <3.5:1 50W Plots available upon request Length: 1400mm Tube Diameter: 16mm 3kg Black, NATO Green or Desert Sand VHF Monopole with Spring Base and NATO 4-Hole mount P MHz <3.5:1 Plots available upon request Length: 1400mm Rod Diameter: 16mm 2.7kg or TNC VHF Monopole with Spring Base and NATO 4-Hole mount P MHz 3dBi Length: 1020mm Rod Diameter: 16mm 2.4kg or TNC VHF/UHF Monopole with Spring Base and NATO 4-Hole mount P MHz 0dBi Length: 700mm Rod Diameter: 70mm 2.4kg

5 UHF Vehicle Antenna P MHz <2.5:1 4dBi Length: 284mm Diameter: 70mm 930g, TNC or BNC Broadband UHF Monopole P MHz 4dBi Length: 330mm Tube Diameter: 70mm 2kg Broadband UHF Monopole P MHz 4dBi Length: 285mm Tube Diameter: 70mm 1.9kg Dual-feed Composite V/UHF and SHF Antenna P Port 1: MHz Port 2: MHz V/UHF: SHF: 50W V/UHF: 4dBi SHF: 2dBi Length: 740mm Width across the wings: 200mm 2.6kg V/UHF: TNC SHF: Type-N 5

6 Ultra-broadband UHF/SHF Antenna P MHz - 6GHz 2dBi Length: 460mm Tube Diameter: 80mm 2kg SHF Antenna with Spring Base and NATO 4-Hole mount P MHz - 2.2GHz 25W 2dBi Length: 440mm 2.1kg or TNC Cost-effective and accurate analysis of optimised antenna placement via advanced electromagnetic (EM) simulation. 6

7 Broadband UHF/SHF Antenna P MHz - 2.2GHz <2.5:1 30W 2dBi Length: 720mm Tube Diameter: 36mm 2.6kg Black, NATO Green or Desert Sand Low Profile U/SHF Antenna P MHz <2.5:1 50W 4dBi Length: 100mm Base Diameter: 60mm 150g Black or White UHF Reduced Height Vehicle Antenna P MHz <2.5:1 50W 3dBi Height: 100mm Base Diameter: 200mm 610g, TNC or BNC Black, White or NATO Green Telemetry Antenna P GHz <2:1 30W 4dBi Height: 60mm Base Diameter: 90mm 100g SMA 7

8 8 Enhanced SHF Antenna P GHz <2:1 30W 6dBi Height: 112mm Base Diameter: 90mm 290g SMA Black Loading Dual-mode Satcom On-The-Move Antenna - Rigid Arms P MHz 1.5:1 Low angle: 3.0:1 150w High angle: RHC, Low angle: Linear, vertical 8dBic/3dBi 3dBi Height: 230mm Cross element length: 540mm designed to withstand 24 stone High angle: N or TNC, Low angle: TNC -51 to +71 C Sand (Black or Green on request) Loading Dual-mode Satcom On-The-Move Antenna - Flexible Arms P MHz 1.5:1 Low angle: 3.0:1 150w High angle: RHC, Low angle: Linear, vertical 8dBic/3dBi 3dBi Height: 230mm Cross element length: 540mm designed to withstand 24 stone High angle: N or TNC, Low angle: TNC -51 to +71 C Sand (Black or Green on request) Dual-band Active GPS Antenna P L1 / L2 <2:3 N/A RHCP Ant 5dBic Amp 21dB Amp Noise Figure <2dB Height: 28mm Length and Width: 76mm 160g SMA Black or NATO Green

9 Dual-band Active GPS Antenna P L1 / L2 <2:3 N/A RHCP Ant 5dBic Amp 21dB Amp Noise Figure <2dB Height: 28mm Length and Width: 76mm 160g SMA Black or NATO Green Dual-band Active GPS Antenna with Magnetic Mount P L1 / L2 <2:3 N/A RHCP Ant 5dBic Amp 21dB Amp Noise Figure <2dB Height: 28mm Length and Width: 76mm 160g SMA Black or NATO Green Antenna Mounting Magnetic Antenna Mounting Plate P Diameter: 400mm 2kg Pre-drilled and tapped to accept both 4-hole rectangular and 3-hole 45PCD pattern Black, Green or Sand 9

10 VHF Monopole P User Speficied UHF Centre Frequency, Typical 2% Bandwidth <2:1 15W 3dBi Typical Length: 300mm Diameter: 20mm 220g TNC White, Grey or Black UHF Monopole P User Speficied UHF Centre Frequency, Typical 6% Bandwidth <2:1 15W 4dBi Typical Length: 120mm Diameter: 16mm 120g TNC White, Grey or Black Testing We offer an excellent outdoor facility for testing antennas plus a turntable that can hold vehicles or other platforms weighing up to 2.5 tons. We can perform RF measurements over the frequency range 10 MHz to 18 GHz. If required, we can also offer a variety of other tests, such as mechanical shock, vibration and environmental tests. 10

11 Covert/discreet We have a wide range of antenna solutions for deep-fit, covert and discreet applications. Such antennas can be body-worn, vehicle-mounted or designed to fit discreetly into most environmental scenarios. Body-worn antennas We provide a number of body-worn antenna solutions. Typically, these could be for mobile TV broadcast systems such as a motorbike-mounted camera system following a cycle race or athletic event on public roads. Other applications include covert security and/or surveillance systems. IFF applications SELEX Communications capability in the field of airborne IFF antennas has been applied to fast-moving jets and other airborne platforms. Solutions are designed using our world-leading computer modelling and simulation capability. Such antennas are optimised for weight and aerodynamic features, as well as all-important antenna performance to enhance the IFF system capability. 11

12 Rapid prototyping Our design and development facility holds stocks of materials commonly used in antenna designs. This supports our ability to rapidly produce new or modified antenna designs for testing, trials and approval exercises. We also work closely with our highly experienced supply chain. Value-added support services To provide customers with the most complete solutions possible, we often support the antenna requirement with additional integrated solutions. These include ground planes, tuning and matching circuits, and components such as multiplexers, combiners/splitters, low noise amplifiers, cable assemblies, voltage surge protection and diversity systems. Disguised antenna designs for the Superyacht market Radiation pattern of an installed antenna on a MASTIFF military vehicle Analysis of rotary modulation effects on the EH101 helicopter Radiation hazard to the human body due to a body-worn antenna Contacts Building 20, A1-2 Southside PO Box 5 Off Southmead Road Filton Bristol BS34 7QW United Kingdom Tel: +44 (0) Fax: +44 (0) antennas.group@selex-comms.com antennas.group@selex-comms.com Tel: +44 (0) SELEX Communications Limited reserves the right to alter without notice the specification, design or conditions of supply of any product or service. SELEX Communications logo is a trademark of SELEX Communications S.p.A. SELEX Communications Limited. All Rights reserved. Version: 1 Feb 2011 MM07294