A novel coplanar-waveguide directional coupler with finite-extent backed conductor

被引：18

作者：

Liao, CL ^{[1
]}

Chen, CH ^{[1
]}

机构：

[1] Natl Taiwan Univ, Grad Inst Commun Engn, Dept Elect Engn, Taipei 106, Taiwan

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2003年 / 51卷 / 01期

关键词：

coplanar waveguide (CPW); directional coupler;

D O I：

10.1109/TMTT.2002.806902

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A novel edge-coupled coplanar-waveguide (CPW) directional coupler with a floating backed conductor is proposed. For design purposes, a theoretical transmission-line model for the coupler is established, which is based on the characteristic parameters of the related coupled CPW structures. To this end, the effective dielectric constants and characteristic impedances of the conductor-backed edge-coupled CPW structures are analyzed using the full-wave analysis based on the spectral-domain approach. Specifically, the coupling coefficient of this new coupler can be controlled by adjusting the width of the backed conductor. In this paper, two conductor-backed edge-coupled CPW directional couplers with moderate (-6 dB) and tight (-3 dB) coupling coefficients are designed and implemented based on the theoretical transmission-line model. The theoretical results are compared with the measured ones, and the agreement among them confirms the usefulness of the coupler design model, as well as the full-wave approach for the related coupled CPW structures.

引用

页码：200 / 206

页数：7

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