Design and Implementation of a TEM Cell with Piecewise Linear Tapering
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.
 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.
 P. Sevat, Design of a TEM cell EMP simulator, Defence Research Establishement, Ottawa, Report no. 1084, June 1991.
 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.
 N. Boriraksantikula, TEM cell design to study electromagnetic radiation exposure from cellular phones, Master of Science Thesis, University of Missouri, Aug. 2008.
 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.
 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.
 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.
 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.
 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.
 D. M. Pozar, Microwave engineering, John Wiley and Sons, 2012.
 G. Matthaei, E.M.T. Jones, and L. Young, Microwave Filters, Impedance-matching Networks, and Coupling Structures, Artech House, 1964.
 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).
 D. K. Cheng, Field and Wave Electromagnetics. 2nd ed., Addison-Wesley, 1983.
 “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.
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)