A Novel Dual-Band 3-dB Branch-Line Coupler Design With Controllable Bandwidths

被引：42
作者：
Cheng, Kwok-Keung M. [1 ]
Yeung, Sung [1 ]
机构：
[1] Chinese Univ Hong Kong, Dept Elect Engn, Shatin, Hong Kong, Peoples R China
来源：
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2012年 / 60卷 / 10期
关键词：
Bandwidth; branch-line coupler; dual band; impedance transformer; phase slope; quarter-wavelength;
D O I：
10.1109/TMTT.2012.2210437
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：
This paper presents, for the first time, the design and implementation of a dual-band branch-line coupler with unequal operating bandwidths. The control of bandwidths is accomplished by the use of dual-band quarter-wavelength impedance transformer with controllable phase slopes over the two designated frequency bands. The adjustment of phase slopes is attained by the proper selection of the circuit parameters of the transformer. For design purposes, closed-form expressions are derived for the determination of the electrical lengths and line impedances of the resulting coupler. For experimental verification, both simulated and measured results of dual-band couplers designed to operate at 1 and 2 GHz are shown.
引用
收藏
页码：3055 / 3061
页数：7
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