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타원형 패치를 이용한 원편파 RFID 리더 안테나 설계
고형석(Hyung-Suk Koh),친저릭 바토치르(Chinzorig Bat-Ochir),방재훈(Jae-Hoon Bang),첸드 쉬지르바타르(Tsend Shijirbaatar),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2011 한국정보기술학회논문지 Vol.9 No.12
This paper presents a circular-polarized RFID reader antenna operating at the UHF band. The proposed antenna consists of an elliptical patch, a coaxial probe feeding the patch, an impedance-matching metallic tuning stub and a ground plane. By adjusting major and minor axes of the patch, the antenna is optimized for a good performance over a large bandwidth. The antenna impedance matching is achieved by using a metallic tuning stub placed close to the feed probe. The antenna optimized using a commercial software is fabricated and its reflection coefficient, gain, radiation pattern, and axial ratio pattern are measured using a network analyzer and a three-dimensional radiation pattern measurement facility. The fabricated antenna shows an excellent performance: a reflection coefficient less than-10㏈ over 857-975㎒, a gain of 9.8㏈ic, and an axial ratio of 2.2㏈.
정용선(Yong-Sun Jung),자르갈사이칸 나이암바얄(Jargalsaikhan Nyambayar),신봉섭(Bong-Sup Sin),고형석(Hyung-Suk Koh),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.8
This paper proposes a near-field RFID reader antenna based on a loop. The proposed antenna consists of a loop loaded with inductors and resistors, a top ground plane for adjusting the far-field gain, a balun and a metal housing. The near magnetic field is generated by a loop consisting of a circular wire and two orthogonal linear wires. Four inductors are placed on the loop to reduce the loop size and four resistors are used to obtain an impedance matching and to control the near magnetic field strength. A ground plan is placed around the loop to reduce the far-field gain of the antenna. A special balun structure is employed to reduce the radiation from the feeding coaxial cable. The loop and the feeding coaxial cable are placed in a metal housing to produce the near magnetic field only in the region just above the antenna. The antenna is optimally designed using a commercial software, then fabricated and tested. The fabricated antenna has a reflection coefficient less than -10dB over 903-921MHz, a far-field gain of -14.5dB, an H-field of 0.38A/m at 40mm above the antenna surface and a tag read distance up to 630mm when a power of 25dBm is supplied to the antenna.