一种新的缺陷地微带线定向耦合器  

A Novel DGS Microstrip Directional Coupler

作　　者：陈蕾[1] 尚宇[1] 魏峰[2] 

机构地区：[1]西安工业大学电子信息工程学院,西安710032 [2]西安电子科技大学天线与微波技术国家重点实验室,西安710071

出　　处：《西安工业大学学报》2008年第4期372-374,382,共4页Journal of Xi’an Technological University

基　　金：陕西省重大科技创新专项资金资助项目(2007ZKC(一)01-03)

摘　　要：传统的微带线定向耦合器隔离度较低,利用功率相消技术虽能有效解决此问题,但耦合器的物理尺寸依然偏大,缺陷地结构的慢波特性可以减少微波器件的尺寸.将功率相消技术和缺陷地结构技术相结合,设计出一种新型微带线定向耦合器,并将其应用于UHF RFID阅读器中.该定向耦合器工作频带为902-928 MHz,工作在920 MHz时隔离度可以达到-49.8 dB,耦合度约为-11 dB,同时将微带线定向耦合器的尺寸减小了20%.The conventional microstrip directional coupler has inherent drawback of poor isolation. The technology based on power canceller effectively solves this problem, but the physical size of the coupler is still large. The slow wave characteristic of defected ground structure can be utilized to reduce the circuit size. Based on the power canceller and defected ground structure technology, a new type of microstrip directional coupler with the operating frequency band between 902-928 MHz for UHF RFID reader is presented, and the size is decreased by 20 %.

关 键 词：缺陷地结构 射频识别 定向耦合器 隔离度 

分 类 号：TN622[电子电信—电路与系统]