一种Ka频段宽频带90°电桥  

A Ka Wideband 90° Coupler

作　　者：袁朝晖[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电通信技术》2008年第4期27-29,共3页Radio Communications Technology

摘　　要：给出了一种结构简单的90°电桥方案,可应用在Ka宽频段卫星通信圆极化馈源系统的接收通路中。这种电桥由2个宽边并列放置的波导通过窄壁耦合构成,采用多级阶梯匹配,不需容性加载调配元件,在ka频段2GHz接收频带内两输出端口相位差90°±0.2°,幅度误差小于0.15dB,回波损耗优于-30dB。已成功应用于一种宽频带Ka段段卫星通信馈源中,馈源系统实测轴比优于0.35dB。The paper presents the design of a compact 90° coupler used in the receiving circuit of Ka Wide Band Satellite Communication circular polarization Feed system. The geometry of this coupler is a slot in the common narrew-wall between two adjacent rectangular waveguides,multiple steps are employed to achieve impedance matching, not required capacitive loading element. The phase difference of the two output ports is 90°±0. 2° across the military and civilian bands of Ka band Satellite Communication, the amplitude error less than 0. 15 dB, and the echo loss better than -30 dB. This design has been used successfully in a Ka Wideband Satellite Communication Feed system, the feed system axial ratio measured is better than 0.35 dB.

关 键 词：KA频段 90°电桥 轴比 馈源系统 

分 类 号：TN622[电子电信—电路与系统]