UMass Method of Moment Electromagnetic Solver
Transcript of UMass Method of Moment Electromagnetic Solver
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A.O. Boryssenko1) & D.H. Schaubert2)
Antenna LaboratoryUniversity of Massachusetts
Amherst MA 01003 USA1)[email protected])[email protected]
UMass Method of Moment UWB Simulator
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Outline
Object-Oriented DesignProgramming in Matlab Macros ScriptsMulti- Component/Task/SolverTemplate LibrariesMatlab-Based Code with FORTRAN DLLs
Basic Concepts
Validation
Physical Phenomenology& Design of UWBLinks
Using Commercial EM SoftwarePrototyping, Practical Design & Tests
Optimal Driving WaveformsOptimal Termination ConditionsAntenna-Signal Co-DesignAntenna-Circuit Co-DesignMeeting to Different Link Merits Source Localization and Imaging with Arrays
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Preprocessor, Engines and Postprocessors
Preprocessor Engines Postprocessor
Geometry
Materials
Freq Domain
Time Domain
SPICE IntegrationArray Configurations
Antennas/Arrays
Tx/Rx Circuitry
Terminal & Radiation
… Supported in current FD version … Tested in other versions
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UMass MoM UWB Link Simulator :: Interface Basics
Four Key Element of Task Specification =Matlab Structural Variables
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Coding of Simulation Scene
Scene.DD=1.8;Scene.tol=1e-6;Scene.Unit='cm';Scene.Figure=1;%Scene.Component(1).Script='Geo_Antenna1';Scene.Component(1). Material=2;Scene.Component(1).MoveToPosition=[0 0 0]; Scene.Component(1).RotateToAngle=[0 0 0];Scene.Component(1).ZLoad=125;Scene.Component(1).ZLine=[125 4 1]; Two-antenna UWB link samples
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Flat Dipole Template
TEM Horn Template
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UWB Simulator Interface: Task Coding
%%% TASK #1%Task(1).Component(1).Port(1).Index=[1];Task(1).Component(1).Port(1).Amplitude=1;%%% TASK #2%Task(2).Component(1).Wave(1).Amplitude=1;Task(2).Component(1).Wave(1).DirectionOfArriving=[90 0];Task(2).Component(1).Wave(1).Polarization=[2];
Some key steps in simulation are GUI-supported
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%%% SOLVER%Solver(1).FreqBand=[0.05:0.75:4.0]'*1e9; % Hz;…
UWB Simulator Solver:: Specifications & Acceleration
Fast Pade Frequency Sweeping = Efficient Search for High-Q resonances
Uniform sampling over the freq. band
20 freq. sampling points are used
High-Q resonances are not accurately caught
Pade adaptive sampling over the freq. band
20 freq. sampling points are used
High-Q resonances are precisely evaluated
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UWB Simulator Interface: Post-Processor
%% Post #1 - ZINP%Post(1).ZINP.Task =1;Post(1).ZINP.Comp = 1;Post(1).ZINP.Port =1;Post(1).ZINP.Proc ='PadeApproxim_25';
Input Impedance of Tx Antenna
Smith Chart for Tx Antenna
Voltage at the load of Rx Antenna(Free-Space Propagation is Removed)
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Antenna-Circuit Co-Design for UW Link:: Optimal Antenna Termination to Tx/Rx Front-Ends
A.O. Boryssenko, D.H. Schaubert, Antenna Link Transfer Function Factorization Applied to Optimized Channel Design, To be submitted to IEEE Trans. on Antennas & Propagation
A.O. Boryssenko, D.H. Schaubert, Dispersive Properties of Terminal-Loaded Dipole Antennas in UWB Link, Submitted to IEEE 2006 Antennas & Propag. Symposium
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Antenna-Signal Co-Design for UW Link:: Optimal Driving Waveforms for Transmitter
Gaussian Pulse Optimal Signal “Matched” to FCC mask
Optimal Analog Pulse Optimal 3-bit Digitized Pulse
A.O. Boryssenko, D.H. Schaubert, Dispersive Properties of Terminal-Loaded Dipole Antennas in UWB Link, To be published in the Journal on VLSI Signal Processing, 2006
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Known Signal Processing Techniques:Kirchhoff Migration … Fast FK Migration … Range Compression …Axial Compression …
Focused Image
Time-Domain Near-Field Beam Forming (Focusing)
Rx Array Collected Raw Signals
color keyed to receivers
Simulation of Antenna and Array Imaging :: Optimal Driving Waveforms for Transmitter
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Validation vs. Experiment in Two-Antenna Link
Phase of Received Voltage
Freq, GHz
Magnitude of Received Voltage
Time Response of Received Voltage
Time, ns
Freq, GHz
EM Coupling Between Two Probes over Finite Ground Plane