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A UHF RFID reader front‐end structure having wideband and stable transmit/receive isolation characteristic is proposed. The proposed structure consists of a wideband balanced coupler and 4‐port feed antenna system. The wideband RFID reader front‐end has a high isolation feature insensitive to load variations. The transmit/receive isolation characteristic is achieved for UHF RFID band (860–960 MHz)...
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