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A novel circularly polarized radio frequency identification (RFID) tag antenna with a capacitive coupling-feed mounted on a metallic plane is proposed. The tag antenna is a compact square-ring patch antenna with two pair of T-shaped slots to obtain circular polarization (CP) radiation. A conjugate match to an Alien Higgs-4 chip with an impedance of 8-j149 Ω at 925 MHz is obtained by connecting two...
A circularly polarized radio frequency identification (RFID) tag antenna with a capacitive coupling-feed mounted on a metallic plane is presented. The tag antenna is a compact square-ring patch antenna with four different sizes of square-slot to obtain circular polarization (CP) radiation. A conjugate match to an Alien Higgs-4 chip with an impedance of 8-j149 Ω at 925 MHz is obtained by connecting...
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