http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
임재홍(Jae-Hong Lim),왕가남(Jianan Wang),이주(Shu Li),방재훈(Jae-Hoon Bang),안병철(Bireng-Chearl Ahn) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.1
In this letter, a broadband circularly-polarized antenna is proposed for UHF RFID applications. The proposed antenna consists of three substrates, a metal cavity and four metal posts. The parasitic patch and radiation patch are realized on the upper and intermediate substrates, respectively. The 50-Ω feeding line puts on the lower substrate and provides successive 90° phase delays to the radiating patch through four metal posts. The width of the feeding line and a size of the radiating patch are firstly calculated with respect to the equivalent dielectric constant obtained from the commercial software. The optimally designed dimensions of the proposed antenna are obtained from the parametric studies. The optimally designed antenna is fabricated and measured to confirm its performances. Measurements show that the fabricated antenna has a reflection coefficient of less than -10dB over 735-979MHz, an axial ratio less than 5dB over 760-930MHz.
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.