基于左手传输线的双频带正交模变换器设计  

Dual-band orthomode transducer using composite right/left-handed transmission lines

作　　者：巩英辉 邓晖[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《电子测量技术》2014年第2期5-8,共4页Electronic Measurement Technology

摘　　要：正交模变换器是在紧缩场测试中应用于平衡馈电网络的重要器件。设计了一种基于复合左右手传输线的正交模变换器,在分别以1.9GHz和2.6GHz为中心频率的2个频带内实现功能。测试结果表明:2个频带内的驻波比都在3以下,其中第2个频带内驻波比在1.5以下;相位差180°±2°;幅度不平度小于0.5dB。研究还发现电桥的存在可以改善驻波比,并且电桥的高度越低驻波比越低。Arbitrary dual-band microstrip components using composite right/left-handed （CRLH） transmission lines are presented.Theory,synthesis procedure,and implementation of the dual-band orthomode transducer （OMT） are presented.Arbitrary dual-band operation is achieved by the frequency offset and the phase slope of the CRLH transmission lines.The dual-band OMT exhibits return loss larger than 6 dB in the first band and larger than 15 dB in the second band,phase difference180°±2°,and gain imbalance less than 0.5 dB.The research also founds the existence of jumpers could increase the return loss and the return loss gets larger as the jumpers get lower.

关 键 词：正交模变换器 复合左右手传输线 双频 

分 类 号：TN62[电子电信—电路与系统]