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RFID 측정 시스템을 위한 고이득 원편파 야기 배열안테나 설계
채윤경(Yoon-Kyoung Chae),이주(Li-Shu),신애령(Ai-Ling Shen),이형진(Jiong-Chen Li),안병철(Bireng-Chearl Ahn) 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.4
In this paper, a high-gain circularly-polarized Yagi array antenna is designed for implementing a UHF RFID measurement system. The proposed antenna consists of a common square reflector, four Yagi elements and a feed network. A single Yagi element consists of a common square reflector, a folded dipole fed by electromagnetic coupling with a strip line, and 11 directors. The circularly-polarized wave is obtained by installing four Yagi elements at 90° intervals on the common square reflector and by providing sequentially 90° phase delays. The directors are fastened on the aluminum mast by bolting to obtain mechanical firmness. The feed network consists of three commercial 90° hybrid coupler and one 90° phase delay line for realizing circularly-polarized waves. The optimal designed antenna is fabricated and measured for verifying its performances. The fabricated antenna has shown that it has a reflection coefficient of less than –15dB, a circular polarized gain of greater than of 15dBic, a half power beamwidth around 30° and an axial ratio of less than 1dB.