Simulazione 3D elettromagnetica Time e Frequency domain Forum R.F.& Wireless, Roma il 21 Ottobre 2008 Dr. Emmanuel Leroux Country Manager for Italy emmanuel.leroux@cst.com 340 3768950 1
Agenda CST company profile Solvers overview, why are both time and frequency domain needed? Test cases: RFID F antenna mounted on a PCB Complete design of an Antenna Array excited by an Amplifier Network Examples in Signal Integrity and EMC 2
founded in 1992 150 employees About CST world-wide distribution network focus on 3D EM simulation Italian branch: Sales and management: Dr. Emmanuel Leroux Support: Dr. Leonardo Sassi, Ing. Edoardo Genovese, Ing. Davide Tallini Sales Administration: Dott.ssa Nicoletta Carminati 3 www.cst.com 10/22/08
Our Markets 4 www.cst.com 10/22/08
Which solver should I use? General purpose solver 3D-volume Transient Frequency Domain large problems broadband arbitrary time signals narrow band / single frequency small problems periodic structures with Floquet port modes Special solver 3D-volume: closed resonant structures Eigenmode FD Resonant strongly resonant structures, narrow band cavities strongly resonant, non radiating structures Special solver 3D-surface: large open metallic structures Integral Equation (based on MLFMM) large structures dominated by metal 5 www.cst.com 10/22/08
CST DESIGN ENVIRONMENT 3D EM: CST Microwave Studio Schematic and circuital: CST Design Studio easy to use 3D fully parametric optimizer automated postprocessing 6 www.cst.com 10/22/08
900 MHz RFID Tag Antenna Simulation of the planar structure with a standard 50 Ω port www.alientechnology.com/products/rfid_tags.php Mesh view 7
900 MHz RFID Tag Antenna 50 Ω Wrong resonance frequency, low coupling Antenna is poorly matched 8 Non-resonant simulation, 3 min sim. time
Matching in CST Design Studio 1.5 Ω Simulation run in CST Design Studio: 5 sec. Resonance frequency correct (900 MHz), excellent matching (-30 db) 9
Field Distorsion by PEC-Cans Unsymmetric fields Second resonance 10 Less perfect matching
11 MWS Simulation of an antenna mounted on a PCB
12 Farfield @ 2.82 GHz
E-Field @ 2.65 GHz Coupling antenna-pcb traces 13
Complete design of an Antenna Array excited by an Amplifier Network Signal Source Phase Shifter Amplifier Power Divider specs: Antenna shall be driven at 5 GHz!!! Instead of one signal source and a power divider two synchronized sources will be used. Matching Network Matching Network Antenna Array 14
Antenna Properties Excitation Properties Insertion Loss 50 Ohms port 7.75 GHz 15
Combined Farfield with 180 Phase Shift for the two patches Combination with 180 phase shift Directivity 10.0 db 16
Matching Network Parameterized matching network Insertion loss at 5 GHz 17
Matching Network Optimization Parameter and goal definitions Results Insertion loss at 5 GHz 18
Signal Source and Amplifier Simple transistor amplifier Voltage probe Voltage at probe V1 19
Amplifier and Matching Network Voltage at 5 GHz Current at antenna port Current at 5 GHz Voltage at antenna port 20
Non-optimal Phase Shifter Phase shifter in microstrip Optimisation definitions Insertion loss at 5 GHz before optimisation 21
Optimisation Results Insertion loss at 5 GHz 180 shift at 5 GHz 22
23 Alltogether: Far field can be tuned!!
Applications Signal Integrity - 70.000 mesh cells - cpu time/port: 560 s - PIV M, 1.7 GHz Multilayer structure: 7 layers Size: 11.2mm x 9.2mm x 0.9mm Frequency range: 0-5 GHz 24
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EMC Some of them by courtesy of A. Orlandi (UMR L Aquila), S. Caniggia, Jim Drewniak (UMR M. Rolla) Susceptibility to ESD GUN Cable to the Oscilloscope Noise margin Burst = 2 kv Burst = 3 kv ESD simulator Strap Point A Point B Interna l loop Slot Electronic Susceptibility to Burst Voltages 26 Shield effectiveness of Cabinet
Key Strengths 1) complete technology for 3D EM time and frequency domain in one interface FIT + PBA + TST for broadband time domain tetrahedral and hexahedral mesh in FD 2) user friendliness intuitive parametric CAD-modeling project templates, expert meshing powerful postprocessing automatic optimizer 3) interoperability efficient design flow integration OLE + VBA-compatible macro language open architecture CST DESIGN STUDIO 4) accuracy and performance reliable virtual prototyping reduced time-to-market Allow real model enhancement using modefrontier 5) technical support / fast software development 27 www.cst.com 10/22/08
-Let s come to our CST workshop on Wireless applications (in Italian) to learn more how to use our software for the simulation and optimization of RF-ID, PIFA antenna, active and passive system: 14.00-17.30 in SALA LICEO al primo piano ->Uso del software commerciale CST MICROWAVE STUDIO per la simulazione/ottimizzazione elettromagnetica di sistemi wireless. Edoardo Genovese, CST -For demo or commercial issues, you are welcome at our booth. -For any other need visit our web site www.cst.com 28