-
摘要:
为突破实际测试当中的局限，研究了横电磁波传输（TEM）室频率范围的扩展方法。运用电磁场与微波技术相关原理，通过分析TEM室壳体开缝对高次模的影响，利用壳体表面电流分布变化规律和波导缝隙天线原理重新解释了开缝对高次模的抑制作用，进而提出了一种TEM室壳体表面开缝的设计方法。通过电磁场数值仿真，验证了抑制高次模工程方法的有效性，并对其控制参数和约束条件的准确性进行了分析评估；通过加工实物并进行实测，进一步验证了新方法的效果。仿真与测试结果表明，开缝抑制高次模的工程方法能够在不减小测试空间与影响主模传输的前提下，将测试带宽扩展了42.9%。
-
关键词:
- 横电磁波传输(TEM)室 /
- 电磁兼容 /
- 高次模 /
- 工作带宽 /
- 波导缝隙天线
Abstract:In order to break through limitatiions in actual testing, the extension method of frequency range of a transverse electromagnetic (TEM) cell is studied. Using the theory of electromagnetic field and microwave technology, the influence of adding slots to the cell on the higher order modes is analyzed, and the suppressing effect of slots on the higher order modes is reinterpreted by summarizing the variation of the distribution of surface current. According to the principle of slotted waveguide antenna, a new method has been proposed to design the slotted surface of the TEM cell. Along with the numerical simulation of electromagnetic field, the paper validates the effectiveness of an engineering method to suppress higher order modes and evaluates the accuracy of the control parameters and the constraint conditions. The effect of the new method is further verified by processing a real cell and its measurement. The simulation and test results show that, without reducing the test space and affecting the main mode, the engineering method of slotted cell can extend the bandwidth by 42.9% by suppressing higher order modes.
-
图 4 第一阶高次模电磁场分布
Figure 4. Electromagnetic field distribution of first-order higher order mode
图 8 第一阶高次模频率随隔板宽度变化规律
Figure 8. Variation of first-order higher order mode frequency with width of septum
-
[1] CRAWFORD M L.Generation of standard EM fields using TEM transmission cells[J].IEEE Transactions on Electromagnetic Compatibility, 1974, 16(4):189-195. https://ieeexplore.ieee.org/document/4090850/ [2] AREZOOMAND M, MEYBODI M K, NOORI N. Design of a TEM cell using both multi-step and piecewise linear tapering[C]//Proceedings of the 20168th International Symposium on Telecommunications (IST). Piscataway, NJ: IEEE Press, 2016: 571-574. [3] DAI F, WANG M, SU D L. A design of new twin TEM cells[C]//IEEE 2005 International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications Proceedings. Piscataway, NJ: IEEE Press, 2005: 10-13. [4] SONG C J, FENG X Y. A new design and implementation of expanding testing space of a transverse electromagnetic cell[C]//The 9th International Conference on Microwave and Millimeter Wave Technology. Piscataway, NJ: IEEE Press, 2016: 967-969. [5] WEN L, YALIN G, JIN L. Three new strip-line TEM cells in EMC test[C]//Proceedings of the 2016 IEEE International Conference on Electronic Information and Communication Technology (ICEICT). Piscataway, NJ: IEEE Press, 2016: 497-500. [6] HILL D A.Bandwidth limitations of TEM cells due to resonances[J].Journal of Microwave Power, 1983, 18(2):181-195. doi: 10.1080/16070658.1983.11689323 [7] WALTERS A J, LEAT C.Control of the TE111 resonance in an asymmetric TEM cell[J].IEEE Transactions on Electromagnetic Compatibility, 2008, 50(2):431-434. doi: 10.1109/TEMC.2008.921010 [8] DENG S W, POMMERENKE D, HUBING T. Mode suppressed TEM cell design for high frequency IC measurements[C]//IEEE International Symposium on Electromagnetic Compatibility. Piscataway, NJ: IEEE Press, 2007: 1-6. [9] DENG S W, POMMERENKE D, HUBING T.An experimental investigation of higher order mode suppression in TEM cells[J].IEEE Transactions on Electromagnetic Compatibility, 2008, 50(2):416-419. doi: 10.1109/TEMC.2008.919028 [10] 苏东林, 陈爱新, 谢树果, 等.电磁场与电磁波[M].北京:高等教育出版社, 2008:349-356.SU D L, CHEN A X, XIE S G, et al.Electromagnetic field and electromagnetic wave[M].Beijing:Higher Education Press, 2008:349-356(in Chinese). [11] 全绍辉.微波技术基础[M].北京:高等教育出版社, 2011:155-157.QUAN S H.The basis of microwave technology[M].Beijing:Higher Education Press, 2011:155-157(in Chinese). [12] 卢万铮.天线原理与技术[M].西安:西安电子科技大学出版社, 2004:221-224.LU W Z.Antenna principle and technology[M]. Xi'an:Xidian University Press, 2004:221-224(in Chinese). [13] 李晓川. 波导缝隙天线极化特性分析与关键技术研究[D]. 哈尔滨: 哈尔滨工程大学, 2012: 5-11.LI X C. Analysis and research of the polarization characteristic and the key technology for the waveguide slot antenna[D]. Harbin: Harbin Engineering University, 2012: 5-11(in Chinese). [14] 林昌禄.天线工程手册[M].北京:电子工业出版社, 2002:272-273.LIN C L.Antenna engineering handbook[M].Beijing:Publishing House of Electronics Industry, 2002:272-273(in Chinese). [15] 黄志洵.矩形结构传输线理论进展[J].光纤与电缆及其应用技术, 1989(6):12-17. http://xueshu.baidu.com/s?wd=paperuri%3A%28c80c8342cd4a70c0b89b2550aa40e740%29&filter=sc_long_sign&tn=SE_xueshusource_2kduw22v&sc_vurl=http%3A%2F%2Fkns.cnki.net%2FKCMS%2Fdetail%2Fdetail.aspx%3Ffilename%3Dgyyd198906003%26dbname%3DCJFD%26dbcode%3DCJFQ&ie=utf-8&sc_us=6924588218999600911HUANG Z X.Theoretical development of rectangular structure transmission line[J].Optical Fiber & Electric Cable and Their Applications, 1989(6):12-17(in Chinese). http://xueshu.baidu.com/s?wd=paperuri%3A%28c80c8342cd4a70c0b89b2550aa40e740%29&filter=sc_long_sign&tn=SE_xueshusource_2kduw22v&sc_vurl=http%3A%2F%2Fkns.cnki.net%2FKCMS%2Fdetail%2Fdetail.aspx%3Ffilename%3Dgyyd198906003%26dbname%3DCJFD%26dbcode%3DCJFQ&ie=utf-8&sc_us=6924588218999600911 -
下载:
点击查看大图
计量
- 文章访问数: 708
- HTML全文浏览量: 183
- PDF下载量: 385
- 被引次数: 0
