一种新型宽频率比的双频环形耦合器  

A novel dual-band rat-race coupler with wide-range frequency ratio

作　　者：张志超 黄玉兰 唐磊 唐瑞瑞 ZHANG Zhi-chao;HUANG Yu-lan;TANG Lei;TANG Rui-rui(School of Electronic Engineering,Xi’ an University of Posts ＆ Telecommunications,Xi’ an 710121,China)

机构地区：[1]西安邮电大学电子工程学院,西安710121

出　　处：《信息技术》2018年第6期60-63,67,共5页Information Technology

基　　金：国家自然科学基金资助项目(61201044);陕西省教育厅专项科研计划基金资助项目(11JK1022);西安邮电大学著作教材建设项目(2014-A);西安邮电大学教改研究专项资助项目(JGA201502)

摘　　要：针对传统双频环形耦合器频率比范围窄的问题,通过在传统T型双频四分之一波长阻抗变换器并联短路枝节。增加了设计自由度,减小了物理实现阻抗范围的限制,从而实现了宽频率比范围(1.5~4.9)。为了验证该方法的可行性,运用该结构设计了一款新型双频环形耦合器,在低频和高频处的带宽分别达到90MHz和120MHz。并将并联短路枝节折叠进耦合器内部空间,实现了更加紧凑的结构,尺寸约为(0.147λL×0.294λL)。As the conventional rat-race coupler is of narrow operation frequency ratio,through the traditional T dual-band 1/4 wavelength impedance converter shunt short-circuit stub. It increased the design degrees of freedom,reduced the physical implementataion impedance range limit,so as realized the wide frequency range（ 1. 5 to 4. 9）. Moreover,a new dual-band rat-race coupler is designed with this structure to verify the proposed design method,attaining 90 MHz and 120 MHz respectively at low frequency and high frequency bandwidth,and the short-circuit in parallel side fold into the internal space of the coupler. Meanwhile,it comes into being a more compact structure with new size（ about 0. 147λL×0. 294λL）.

关 键 词：双频 环形耦合器 宽频率比 阻抗变换器 带宽 

分 类 号：TN819.1[电子电信—信息与通信工程]