2D-FEM Characterization and Design of Inhomogeneous Coupled Cylindrical Microstrip Line for Microwave Applications

Yamina Bekri, N. Benahmed, N. Benabdallah, Djamal Lachachi
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Abstract

In the recent years, there has been a growing interest in the use of cylindrical transmission lines in a variety of applications. This work presents analysis and study of inhomogeneous coupled cylindrical microstrip line (CCML), convenient for microwave and millimeter-wave circuits mounted on cylindrical substrate applications. Firstly, the influence of the geometrical parameters on the electromagnetic parameters (EM) by using finite element method (FEM) analysis in two dimensions (2D) under FreeFEM environment is studied. We have focused mainly on calculating the even- and odd-mode characteristic impedances, the even- and odd-mode effective dielectric constants, and the coupling coefficient, as a function of the geometrical parameters. As validation, we have compared our results with those published in the literature and excellent agreement is found. Later, the typical design-curves results are used to design and build several high-performance microwave directional cylindrical microstrip couplers (CMC), of 20 dB, 30dB and 15 dB, operating respectively at 6, 2 and 1 GHz, and adapted to 50 $\Omega$, useful for microwave measurement systems. Finally, we have made a comparison between simulation results in terms of directivity and isolation performances.
微波非均匀耦合圆柱微带线的二维有限元分析与设计
近年来,人们对在各种应用中使用圆柱形传输线越来越感兴趣。本文分析和研究了非均匀耦合圆柱形微带线(CCML),便于微波和毫米波电路安装在圆柱形衬底上。首先,在FreeFEM环境下,采用二维有限元法分析了几何参数对电磁参数的影响。我们主要计算了偶模和奇模特征阻抗、偶模和奇模有效介电常数以及耦合系数作为几何参数的函数。作为验证,我们将我们的结果与文献中发表的结果进行了比较,发现非常一致。随后,利用典型的设计曲线结果设计并构建了几种高性能的微波定向圆柱形微带耦合器(CMC),分别为20db、30dB和15db,工作频率分别为6 GHz、2 GHz和1 GHz,适用于微波测量系统。最后,我们从指向性和隔离性两个方面对仿真结果进行了比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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