EMI Measurement Technique Investigation Using Gigahertz Transverse Electromagnetic Cell

• Main Authors: Hui-Ling Ting, 丁惠玲
• Other Authors: 吳宗霖
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/78162459977262592677

碩士 === 國立臺灣大學 === 電信工程學研究所 === 96 === This thesis includes the theory derivation of the EMI measurement while using the GTEM Cell as a measuring apparatus and discusses the inaccuracy of the theory. Based on the theory we try to develop a novel program to solve the problems that are originated from the commercial program’s limit of the working frequency and measurement setup. We validate this theory through the use of simulation software and semi-anechoic chambers (SAC). It’s not possible to validate algorithms along with voltage simulation while simulation of total radiated power on the contrary is a good way. Comparing the data, simulating from the total radiated power values is more direct and efficient than simulating the voltages according to the algorithm derivation. Besides it needs only a personal computer and lower memory requirement and save time. The validation results clearly show the performance for emission testing of the GTEM cell, especially in high frequency. Three different objects are used as the equipment under tests (EUT). The first EUT is a bare board. We compare the total radiated power values that obtained from GTEM cell and HFSS simulation with frequency ranging from 1GHz to 6GHz. The second EUT is a comb generator in both GTEM cell and 3m/10m chamber. We foresee the data from both tests should be corresponding because the comb generator radiates like a dipole. The results correspond with our anticipation. For the final test, a board with EBG structure is used as the EUT. We research the EMI performance with frequency ranging from 1 GHz to 10 GHz. We also make a comparison of total radiated power values that gained from GTEM Cell and Ansoft HFSS simulation. The result somewhat is not as ideal as the former two EUTs. But the difference is considered within a reasonable range.