Anechoic Chamber Simulation Tool using Integrated FDTD and SBR Ray Tracing

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: F04611-01-C-0045
Agency Tracking Number: 011XP-0866
Amount: $99,722.00
Phase: Phase I
Program: SBIR
Awards Year: 2001
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
315 S. Allen St., Suite 222, State College, PA, 16801
DUNS: 945483733
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Christopher Penney
 Electromagnetic Analyst
 (636) 536-1205
Business Contact
 Raymond Luebbers
Title: President
Phone: (814) 861-1299
Research Institution
Accurate analysis of electromagnetic anechoic chambers is a challenging problem.The geometry is complicated and includes multiple antenna radiators, targets,supporting structures, and absorber. Furthermore the frequency range isextensive, traversing a broad range from 200 MHz to 18 GHz. For largechambers this means the chamber size in wavelengths varies over a verylarge range over which different calculation methods must be applied forgood accuracy. Our approach is that for the lower range of frequenciesthe finite difference time domain (FDTD) method will be used to analyzethe entire anechoic chamber. At the higher frequencies shooting andbouncing ray methods will be used. At intermediate frequencies theFDTD method can be used to analyze portions of the anechoic chamber,such as feed and target regions, with these results used to excitethe shooting and bouncing ray method in a hybrid fashion. Both methodswill be integrated under a single graphical user interface which willallow operator control of the excitation antennas, target geometry, andcalculation parameters. The GUI will also provide display of fields overa variety of surfaces inside the chamber and straightforward comparisonwith measured fields for validation.The primary anticipated benefit of the proposed anechoic chamber simulationtool will be more accurate and reliable measurements.These will result from the ability to use the simulation tool to planthe test configuration, taking into account the radiation and scatteringfrom the various antennas, support structures, absorber, and thetargets themselves. This will be done prior to the actual measurementsbeing made, so that measurements will not need to be repeated due tounexpected disturbance of the desired illuminating field by the testarticles or other structures in the chamber.

* Information listed above is at the time of submission. *

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