Abstract
본 논문에서는 Hilbert 커브 프랙탈 구조를 이용하고 안테나 밑면에 부분 접지면을 추가하여 910MHz에서 공진하는 UHF 대역 RFID 리더 안테나를 제안하였다. 안테나의 입력임피던스는 안테나를 구성하는 선로 편의 길이와 폭을 변화시키고 경유 홀의 위치를 이동시켜 <TEX>$ 50\Omega$</TEX>을 갖는 급전선과 정합시켰다. 또한 안테나의 이득과 지향성은 부분 접지면의 크기를 변화시키고 선로 편을 추가하여 향상시켰다. 제작된 안테나의 크기는 <TEX>$68mm\times68mm$</TEX>, 임피던스 대역폭(VSWR<2)은 <TEX>$882\sim942MHz$</TEX>이고 반사손실과 이득특성은 910MHz에서 -18.2dB, 5.3dBi를 갖는다. In this paper, UHF band RFID reader antenna using filbert curve fractal structure and adding the partially grounded plane at the bottom of antenna, which has a resonant frequency at 910MHz, is proposed. Input impedance of antenna is matched with the feed line of 50ohm by varying the length and width of line segment making up the antenna, and by moving the position of via hole. The gain and directivity of antenna is enhanced as varying the dimension of the partially grounded plane and adding the line segment. The size of fabricated antenna is <TEX>$68mm\times68mm$</TEX>. The impedance band width(VSWR<2) is <TEX>$882\sim942MHz$</TEX>. The return loss and the gain of fabricated antenna are -18.2dB, 5.3dBi at 910MHz.
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