Design and Implementation of a TEM Cell with Piecewise Linear Tapering

  • Masoud Arezoomand ICT Research Institute (ITRC)
  • Mohsen Kalantari Meybodi ICT Research Institute (ITRC)
  • Narges Noori ICT Research Institute (ITRC)
Keywords: TEM Cell design, EMI/EMC experiments, calibration of RF field probes

Abstract

The transverse electromagnetic (TEM) cells are used for electromagnetic interference/compatibility (EMI/EMC) experiments of the small RF devices in a laboratory environment. The standard electromagnetic fields generated in the shielded environment of a TEM cell can also be used for calibration of the RF field probes.  In this paper, a 50 W open TEM cell is designed and fabricated to generate standard electromagnetic fields from 1 MHz up to 1 GHz. To overcome the impedance mismatch and improve the voltage standing wave ratio (VSWR) along the TEM cell, a new piecewise linear tapering method is proposed for the inner conductor of the cell. The resulted matching conditions of the new tapering method are presented through some numerical simulations and measurements and compared to those of the conventional simple linear tapering.

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Author Biographies

Masoud Arezoomand, ICT Research Institute (ITRC)

Masoud Arezoomand was born in Bojnourd, Iran, in 1966. He received the B.S. degree in electronic engineering from the Ferdowsi university of Mashhad, Mashhad, Iran, and M.S. degrees in communication engineering from the Sharif University, Tehran, Iran, in 1988 and 1991. He is currently Working toward the Ph.D. degree at Shahid Beheshti University, Tehran, Iran. His main research interests include microwave and mm-wave passive and active circuits and devices. From 1991 to 2013, he was a Research Assistant and Member of scientific Board with the ICT Research Institute, formerly Iran Telecom. Research Center (ITRC), Tehran, Iran. He won two national award for conducting projects on digital radio system design and manufacturing in 1995 and 2000.

Mohsen Kalantari Meybodi, ICT Research Institute (ITRC)

Mohsen Kalantari Meybodi received the Ph.D. degree in electrical engineering from Shahid Beheshti University, Tehran, Iran, in 2017. Since February 2016, he has been with the ICT Research Institute, Tehran. His current research interests include electromagnetic absorbers and detectors, periodic structures, and numerical techniques in electromagnetism.

Narges Noori, ICT Research Institute (ITRC)

Narges Noori received B.Sc., M.Sc. and Ph. D. degrees (with honors) from Iran University of Science and Technology (IUST), Tehran, Iran, all in Electrical Engineering, in 1998, 2000 and 2006, respectively. From June 2004 to April 2005, she was with the RF/Microwave and Photonics Group, University of Waterloo, Waterloo, Ontario, Canada as a visiting scholar. In May 2005, she joint ICT Research Institute (ITRC), Tehran, Iran where she is now working as an associate professor. In 2008, she received the best researcher award from Iran ministry of ICT. She has participated and managed several research projects in radio communication group of ITRC. Her research interests include wireless communications, radiowave propagation and channel modeling.

References

[1] M. L. Crawford, “Generation of standard EM fields using TEM transmission cells,” IEEE Transactions on Electromagnetic Compatibility, vol. 16, no. 4, 189-195, Nov. 1974.
[2] C. Iftode and S. Miclaus, “Design and validation of a TEM Cell used for radiofrequency dosimetric studies,” Progress In Electromagnetics Research, vol. 132, pp. 369-388, Jan. 2012.
[3] P. Sevat, Design of a TEM cell EMP simulator, Defence Research Establishement, Ottawa, Report no. 1084, June 1991.
[4] S. M. Satavand and V. Agarwal, “Do-it-Yourself Fabrication of an Open TEM Cell for EMC Pre-compliance,” IEEE EMC Society Newsletter, pp. 66-71, 2008.
[5] N. Boriraksantikula, TEM cell design to study electromagnetic radiation exposure from cellular phones, Master of Science Thesis, University of Missouri, Aug. 2008.
[6] C. Yıldız, G. Demirel and F. Çalışkan, “Numerical and experimental analysis of transverse electromagnetic cell,” International Journal of RF and Microwave Computer-Aided Engineering, vol. 26, no. 4, (2016), 373–378.
[7] S. Wen, J. Zhang, and Y. Lv, “The optimization design of septum in TEM cells for IC EMC Measurement,” in Proc. 7th Asia-Pacific Conference on Environmental Electromagnetics (CEEM), pp. 250-253, Nov. 2015.
[8] C. M. Weil and L. Gruner, “High-order mode cutoff in rectangular striplines,” IEEE Trans. Microwave Theory and Technique, vol. MTT- 32, pp. 638-641, June 1984.
[9] D. Desideri and A. Maschio, “Development and commissioning of a test system based on a TEM cell for RF exposure,” Braz. J. of Biomedical Engineering, vol. 27, Supp.1, pp. 25-30, Dec. 2011.
[10] P. Alotto, D. Desideri and Alvise Maschio, “Parametric analysis and optimization of the shape of the transitions of a two-port rectangular TEM cell,” in Proc. International Symposium on Electromagnetic Compatibility (EMC EUROPE), Sept. 2012.
[11] D. M. Pozar, Microwave engineering, John Wiley and Sons, 2012.
[12] G. Matthaei, E.M.T. Jones, and L. Young, Microwave Filters, Impedance-matching Networks, and Coupling Structures, Artech House, 1964.
[13] M. Arezoomand, M. Kalantari Meybodi and N. Noori, “Design of a TEM Cell Using Both Multi-Step and Piecewise Linear Tapering,” in Proc. 8th International Symposium on Telecommunications (IST), Tehran, Iran, (2016).
[14] D. K. Cheng, Field and Wave Electromagnetics. 2nd ed., Addison-Wesley, 1983.
[15] “IEEE Standard for Calibration of Electromagnetic Field Sensors and Probes (Excluding Antennas) from 9 kHz to 40 GHz," in IEEE Std 1309-2013 (Revision of IEEE Std 1309-2005), pp.1-111, Nov. 22 2013, doi: 10.1109/IEEESTD.2013.6673999.
Design and Implementation of a TEM Cell with Piecewise Linear Tapering
Published
2018-02-17
How to Cite
Arezoomand, M., Kalantari Meybodi, M., & Noori, N. (2018, February 17). Design and Implementation of a TEM Cell with Piecewise Linear Tapering. International Journal of Information & Communication Technology Research, 9(3), 1-6. Retrieved from http://journal.itrc.ac.ir/index.php/ijictr/article/view/308
Section
Communication Technology