Abstract：The field uniformity and dominant TEM mode performance of the test field acting on the equipment under test(EUT)in gigahertz transverse electromagnetic(GTEM)cell were studied. The three-dimensional finite-difference time-domain(FDTD)method was used to model the GTEM cell loaded with a metallic EUT in cartesian coordinates.The calculation and analysis frequency is up to 2 GHz.The field distribution performance of a larger EUT and a small EUT were calculated,and the effects of EUT size on field performance were analyzed.Not only the dominant field component uniformity but also the resultant field strength uniformity was studied.Furthermore,the variation trend of average value for each field component with frequency increasing was provided.The obtained results show that the field uniformity for small EUT is perfect,while for the large EUT the field uniformity will decrease when the working frequency is more than its permitted frequency.The results also show that the cross-polar performance will decrease at high frequencies whether for small EUT or for large EUT,which is caused mainly by the increasing of longitudinal component.
胡玉生,郑捷庆,杨荣彬. GTEM小室中EUT受试电磁场场分布性能[J]. 计量学报, 2012, 33(4): 355-359.
HU Yu-sheng,ZHENG Jie-qing,YANG Rong-bin. Field Distribution and Performance Analysis of the Test Field Acting on EUT Loaded in GTEM Cell Using FDTD Method. Acta Metrologica Sinica, 2012, 33(4): 355-359.
［1］Hansen D, Wilson P, Koenigstein D, et al. A broadband alternative EMC test chamber based on a TEM cell anechoic-chamber Hybrid approach［C］//Proc of the Int Symp on EMC, Nagoya, Japan, 1989, 133-137.
［2］Groh C, Karst J P, Koch M, et al. TEM Waveguides for EMC Measurements［J］. IEEE Trans on EMC, 1999, 41(4): 440-446.
［3］De Leo R, Pierantoni L, Rozzi T, et al. Dipole excitation and scattering by spherical objects in GTEM cell［J］. IEEE Transactions on Microwave Theory and Techniques Part:1-2,1994,42(9):1700-1708.
［4］De Leo R, Schiavoni A. FDTD evaluation of scattering by metallic objects in GTEM cells［J］. IEE Proceedings Science, Measurement and Technology, 1994, 141(4): 287-292.
［5］Karst J P, Garbe H. Characterization of loaded TEM-waveguides using time-domain reflectometry［C］//IEEE International Symposium on Electromagnetic Compatibility, Seattle, WA, 1999, 1: 127-132.
［6］Ishigami S, Harima K, Yamanaka Y. Estimation of E-field distribution in a loaded GTEM cell ［C］//IEEE International Symposium on Electromagnetic Compatibility, Montreal Que, 2001, 1: 129-134.
［7］Zellerhoff M, Hannemann J, Klinkenbusch L. Electromagnetic coupling between a GTEM-cell and a device under test: a hybrid modal-analysis & method-of-moments approach［J］. IEEE International Symposium on Antennas and Propagation Society, 2002, 3(3): 286-289.
［8］Pouhe D, Monich G. On the Interplay Between the Equipment Under Test and TEM Cells［J］. IEEE Transactions on Electromagnetic Compatibility, 2008, 50(1): 3-12.
［9］胡玉生,朱剑英. 横电磁波室试验场强评估的影响因素分析［J］. 计量学报, 2008, 29(4): 365-368.
［10］Ifong W, Ishigami S, Gotoh K, et al. Effect on electric field of foam block in GTEM cell［C］//IEEE International Symposium on Electromagnetic Compatibility, Austin, TX, 2009, 233-237.
［11］Malaric K, Bartolic J, Modlic B. Absorber and resistor contribution in the GTEM-cell［C］//IEEE International Symposium on Electromagnetic Compatibility,Washington, DC, 2000, 2: 891-896.
［12］Heidemann M, Garbe H. Using TEM waveguides according to the new IEC 61000-4-20［C］//IEEE Int Symp on Electromagnetic Compatibility, Istanbul, Turkey, 2003, 1: 457-460.
［13］IEC 61000-4-20 Electromagnetic Compatibility (EMC)-Part4: Testing and measurement techniques. Section 20: Emission and Immunity Testing in Transverse Electromagnetic (TEM) Waveguides［S］. 2003.
［14］Bozec D, McCormack L M, Marvin A C, et al. A good practice guide for the use of GTEM cells in EMC measurements according to IEC61000-4-20［C］//IEEE Int Symp on Electromagnetic Compatibility, Santa Clara, United States, 2004, 2: 660-665.
［15］汤仕平,蒋全兴,周忠元,等.异形吉赫横电磁波室场强装置［J］.计量学报, 2005, 26(2): 171-175.
2012, Vol. 33 
