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IJSTR >> Volume 9 - Issue 12, December 2020 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

2D-FEM Electromagnetic Characterization Of Quasi-TEM Coupled Elliptical Microstrip Line For Microwave Applications

[Full Text]



Yamina Bekri, Nasreddine Benahmed



2D-FEM electromagnetic characterization, Quasi-TEM coupled elliptical microstrip line, Elliptical microstrip directional coupler.



In this paper, we present analysis and study of quasi-transverse electromagnetic (quasi-TEM) coupled elliptical microstrip line (CEML), convenient for microwave and RF applications, by using finite element method (FEM) in two dimensions (2D) under FreeFEM environment. Firstly, we have rigorously determined the quasi-TEM electromagnetic parameters (EM) of the CEML line. For this type of structure, there are no analytical or numerical results found in the scientific literature. Accordingly, to validate our results, we have adapted our 2D-FEM program to study the general configuration of the coupled cylindrical microstrip line (CCML), and excellent agreement is found between our FEM results and those obtained with other techniques of the scientific literature. Later, to show the practicality and the usefulness of our 2D-FEM results, we have successfully used the found quasi-TEM parameters to design a new microwave directional 20-dB, 50-Ω elliptical microstrip coupler (EMC) operating at 2-GHz, with high-performances in terms of isolation (53 dB), directivity (34 dB) and reflection (46 dB), realized in Matlab environment, convenient for microwave measurement telecommunication systems and radar applications. Finally, to reinforce our work, the directional EMC coupler’s coupling response obtained under Matlab environment was validated by our results obtained under CST Microwave Studio Software.



[1] N. Dib, T. Weller, M. Scardelletti., and M. Imparato, “Analysis of cylindrical transmission lines with the finite difference time domain method,” IEEE Transactions on Microwave Theory and Techniques, vol. 47, no. 4, pp. 509-512, 1999.
[2] T. Kitamura, T. Koshimae, K. Hira, and S. Kurazono, “Analysis of cylindrical microstrip lines utilizing the finite difference time-domain method,” IEEE Transactions on Microwave Theory Techniques, vol. 42, no. 7, pp. 1279-1282, 1994.
[3] N. Dib and T. Weller, “Two-dimensional finite difference time domain analysis of cylindrical transmission lines," International journal of electronics, vol. 87, no. 9, pp. 1065-1081, 2000.
[4] A. Nakatani and N. Alexopoulos, “Coupled microstrip lines on a cylindrical substrate," IEEE Transactions on Microwave Theory and Techniques, vol. 35, no. 12, pp. 1392–1398, 1987.
[5] A. Nakatani, “Microstrip circuits and antennas on cylindrical substrates”, PhD thesis, University of California, Los Angeles, 1988.
[6] F. Silva, S. Fonseca, A. Soares, and A. Giarola, “Effect of dielectric overlay in a microstrip line on circular cylindrical surface,” IEEE Transactions on Microwave Theory and Techniques, vol. 2, no. 9, pp. 359-360, 1992.
[7] H. Chen and K. Wong, “Characterization of coupled cylindrical microstrip lines mounted inside a ground cylinder,” Microwave and Optical Technology Letters, vol. 10, no. 6, pp. 330-333, 1995.
[8] H. Chen and K. Wong, “A Study of the transverse current contribution on the characteristics of a wide cylindrical microstrip line,” Microwave and Optical Technology Letters, vol. 11, no. 6, pp. 339-342, 1996.
[9] D. Lachachi, Y. Bekri, N. Benabdallah, M. Chetioui, A. Boudkhil, and N. Benahmed, “Accurate closed-form formulas for the electromagnetic parameters of a new low-loss high performance quasi-TEM sliced coaxial coupler,” International Journal of Microwave and Optical Technology, vol. 15, no. 2, pp. 122-131, 2020.
[10] Y. Bekri, N. Benabdallah, D. Lachachi and N. Benahmed, “Expressions for the TEM-parameters deduced from FEM-analyses for shielded and coupled cylindrical striplines,” International Journal of Electronics and Communications (AEÜ) , vol. 70, no. 3, pp. 241-249, 2016.
[11] Y. Bekri and N. Benahmed, “Simple CAD Models for Novel 50 Ω and 75 Ω Cylindrical Stripline Couplers," 2019 International Conference on Wireless Technologies, Embedded and Intelligent Systems (WITS), Fez, Morocco, 2019, pp. 1-6, doi: 10.1109/WITS.2019.8723813.
[12] Y. Bekri and N. Benahmed, “FEM Analysis of a New Type of Cylindrical Stripline Couplers for High-Power Applications,” 2019 International Conference on Advanced Electrical Engineering (ICAEE), Algiers, Algeria, 2019, pp. 1-6, doi: 10.1109/ICAEE47123.2019.9015141.
[13] Y. Bekri, N. Benabdallah, D. Lachachi, and N. Benahmed, “Novel analytical expressions for the electromagnetic parameters of cylindrical striplines,” Journal of Science & Technology, vol. 16, no. 01, pp. 01-11, 2016.
[14] Y. Bekri, N. Benahmed, N. Benabdallah, and D. Lachachi, “2D-FEM Characterization and Design of Inhomogeneous Coupled Cylindrical Microstrip Line for Microwave Applications,” 020 1st International Conference on Communications, Control Systems and Signal Processing (CCSSP), EL OUED, Algeria, 2020, pp. 545-551, doi: 10.1109/CCSSP49278.2020.9151645.
[15] www.freefem.org
[16] www.mathworks.com
[17] http://www.cst.com.
[18] http://www.microcal.com.