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用于电磁兼容测试的混响室环境的数值模拟

来源:发布时间:2015-05-28

报告题目: Numerical Modeling of Reverberation Chamber Environment for Electromagnetic Compatibility Testing
用于电磁兼容测试的混响室环境的数值模拟

报告人: James C. West
Professor and Interim Head
Electrical and Computer Engineering, Oklahoma State University, Stillwater, OK, USA

报告时间: 2015年6月2日上午10:00
报告地点: 会议楼第八会议室
报告人简介:   Prof. James C. West received the BS degree from the University of Oklahoma, Norman in 1982, the MS degree from the University of Kansas, Lawrence 1986, and the PhD degree from the University of Kansas, Lawrence in 1989, all in Electrical Engineering. He joined the Oklahoma State University School of Electrical and Computer Engineering in 1989 as an Assistant Professor and was promoted to Associate Professor in 1993 and Professor in 2000. He has also served as Interim Department Head since Sepember, 2013. He served as Visiting Scientist at the US Naval Research Laboratory from August 1998 through July 1999 and has served as summer faculty fellow numerous times at NASA Goddard Space flight center (1991), Air Force Research Laboratory (1994, 1995, 2007), and Sandia National Laboratories (2011). His research interests include computational electromagnetics and digital signal processing applied to various electromagnetic phenomena, including EMC testing, antenna design, rough surface scattering, and synthetic aperture radar imaging. He is a senior member of IEEE.

报告摘要:   Conducting-wall reverberation chambers provide an environment for robust electromagnetic susceptibility testing of electronic equipment. Multiple resonant (or reverberant) modes are established within the chamber at any operating frequency, giving a random magnitude, phase, and orientation of the electric field at different points within the chamber. Redistributing the electromagnetic energy across the resonant modes (“stirring”) by changing the chamber boundary conditions yields unique, random fields across the equipment under test (EUT).
  Numerical modeling of the reverberation chamber environment using traditional techniques such as the moment method or finite element method to mesh the chamber walls/volume has proven difficult. The strong resonances present lead to poorly conditioned interaction matrices that give slow iterative solution and increased numerical errors. In this work, two different methods to numerically model the chamber electromagnetic environment are presented. In the first, the field environment is simulated by optimally sampling the ideal plane-wave spectrum within the chamber to yield a discrete spectrum that gives ideal-chamber field statistics over the EUT. The EUT can therefore be modeled in a free-space environment, avoiding poor interaction matrix conditioning. Experimental validation of the approach will be shown. In the second approach, the moment method is implemented using the cavity Green's function for rectangular cavities. Again only the EUT need be numerically modeled, avoiding the ill-conditioning of the interaction matrix. This method is used to test the stirring effectiveness of a simple mechanical tuner in an operational reverberation chamber under different chamber quality factors.

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