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RFID Reader Front-End Having Robust Tx Leakage Canceller for Load Variation

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5 Author(s)
Won-Gyu Lim ; Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Daejeon ; Seo-Young Park ; Wang-Ik Son ; Moon-Que Lee
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A novel front-end structure for ultra-high-frequency RF identification reader is proposed. The proposed front-end consists of a balanced coupler and four-port feed antenna system. The proposed balanced coupler structure has high transmit/receiver isolation feature and good insensitivity to load variations. The proposed four-port feed antenna system is applied for removing the coupling among antennas, which deteriorates the isolation. The proposed system is numerically analyzed and verified experimentally as well.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:57 ,  Issue: 5 )