Synthesizing microstrip branch-line couplers with predetermined compact size and bandwidth

被引：112
作者：
Tang, Ching-Wen [1 ]
Chen, Ming-Guang
机构：
[1] Natl Chung Cheng Univ, Dept Commun Engn, Dept Elect Engn, Ctr Telecommun Res, Chiayi 621, Taiwan
[2] Natl Chung Cheng Univ, Dept Elect Engn, Chiayi, Taiwan
来源：
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2007年 / 55卷 / 09期
关键词：
branch-line coupler;
D O I：
10.1109/TMTT.2007.904331
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 new method for designing the microstrip branchline couplers with predetermined compact size and bandwidth is proposed in this paper. With the proposed approach, the size of the quarter-wavelength transmission line in the branch-line coupler can be reduced greatly. In addition, the proposed couplers can be easily fabricated on the printed circuit board without any lumped element. A chart concludes the relationship between bandwidth and size reduction rate. It shows that open stubs with low impedance perform better than those with high impedance; moreover, the more open stubs with low impedance utilized, the broader the bandwidth will be. Furthermore, the measured frequency responses show good agreement with the theoretical results.
引用
收藏
页码：1926 / 1934
页数：9
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