본 논문에서는 433MHz에서 동작하는 RFID 리더용 직교형 안테나에 관하여 기술하였다. 본 이중편파 안테나는 1x2 서브 어레이를 기본으로 하여 급전회로망의 위상을 동위상 또는 반대 위상을 갖도록하여 2개 안테나의 방사체에서의 상대적인 전류분포를 제어하여 빔 패턴에서 편파를 수직 및 수평으로 복사가 가능토록 하였다. 단일 안테나는 역-에프형 구조를 이용하였으며 위상차에 따른 단락점에서부터 개방점 까지의 전류의 변화가 궁극적으로 수직 및 수평 편파가 제어되도록 하였다. 이중입력에 대한 안테나의 이득은 수직 및 수평 편파에 대하여 2.7 및 0.4dBi를 나타내었으며, 포트간 아이솔레이션은 25dB 이하의 특성을 나타내었다.
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