Ka频段宽带双口双模馈源设计  

Design of a Ka- band Wide Band Dual- aperture Dual- mode Feed

作　　者：马世娟 王建[1] 邵凯[1] 郑贵[1] 司海峰[1] 

机构地区：[1]电子科技大学电子工程学院,成都611731

出　　处：《电讯技术》2015年第11期1290-1295,共6页Telecommunication Engineering

摘　　要：针对卡塞格伦天线系统对馈源的要求,设计了一种Ka频段双口双模馈源,可与X频段馈源组合成体积较小的双频段馈源。采用圆环状的和差比较器结构,降低了双频段馈源的体积,通过添加过渡阶梯、圆柱销钉与金属调配板等设计,改善了双频段馈源的性能。测试结果表明,在绝对带宽2 GHz范围内,S和口、E差口与H差口驻波比均小于2,3个端口间的隔离度均大于25 d B。测试频率的和方向图在±60°时的归一化增益均在-14^-20 d B范围内,初级归一化和方向图的对称性较理想,差方向图的零值深度均小于-25 d B,满足卡塞格伦天线对馈源设计的指标要求。In order to meet the requirements of Cassegrain reflector antenna system for feed,a Ka-band du-al-aperture dual-mode feed is designed in this paper,which can be constituted a dual-band feed with an X-band feed. An annular comparator structure is designed to reduce the size of dual-band feed. The tran-sitional steps,cylindrical pins and adjustment board are used to improve the performance of dual-band feed. Test results show that the voltage standing wave ratio( VSWR) of S sum port,S difference port and H difference port are all below 2,the isolation among these three ports are all larger than 25 dB in the band-width of absolute 2 GHz. The normalized gain of sum patterns is between -20 dB and -14 dB at ±60°. The symmetry of primary normalized sum pattern is ideal. The zero depths of difference patterns are all be-low -25 dB. The test results verify that the designed feed meets the requirements of Cassegrain reflector antenna.

关 键 词：卡塞格伦天线 双口双模 Ka频段宽带馈源 

分 类 号：TN819.1[电子电信—信息与通信工程]