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In this paper, we discuss change of read range between a UHF passive RFID tag and reader when a tag is close to another tag. The read range is determined by the strength of forward link and reverse link, which are represented by received power at a tag and reader, respectively. Approaching of tags causes electromagnetic interference between antennas of tags and results in change in impedance matching...
In this paper, an UHF tag antenna is demonstrated to be co-designed with a plastic Sushi plate to achieve the conjugate impedance matching between the antenna and the ASIC. The reading range of the RFID system using such co-designed tag is greatly enhanced.
In this paper, we propose a new loop tag for near field communication in UHF band. The proposed loop tag is composed of a loop structure for coupling to reader and a microchip for modulation. Specially, the suggested loop tag differs from a general single loop tag in that there are a number of linked loops as a antenna body to enhance the near magnetic field. To understand impedance matching principle...
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