Broadband Rat-Race Couplers With Coupled-Line Section and Impedance Transformers

被引：49
作者：
Gruszczynski, Slawomir [1 ]
Wincza, Krzysztof [1 ]
机构：
[1] AGH Univ Sci & Technol, Dept Elect, PL-30059 Krakow, Poland
来源：
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS | 2012年 / 22卷 / 01期
关键词：
Coupled-line section; impedance transformers; rat-race couplers; wideband rat-race couplers; HYBRID; RING;
D O I：
10.1109/LMWC.2011.2177649
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：
Design of broadband rat-race couplers with the use of a shorted coupled-line section and impedance transformers has been comprehensively investigated. A broadband rat-race coupler utilizing a shorted coupled-line section and two shorted quarter-wave long transmission lines has been modified allowing for achieving ideal isolations between two pairs of respective ports. Also it has been shown that the bandwidth of such couplers can be increased when multisection impedance transformers are applied, and that the Darlington synthesis procedure can be used for calculation of transmission-line impedances. A tabular data for rat-race couplers with up to four-section impedance transformers is given. The theoretical analysis has been verified by measurements of the manufactured broadband rat-race coupler operating within 0.8 to 2.8 GHz frequency range.
引用
收藏
页码：22 / 24
页数：3
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