E fields from the retro-radiating antennas add constructively in the direction of the incoming signal automatically, the reading distance is greatly increased compared with the conventional tags with orthogonally placed antennas. The tag with symmetric filters and arrangements can further enhance the detection robustness regardless of the reader's positions. Moreover, the circularly polarized tag is insensitive to the polarization of the incoming signals. The experimental results measured in the anechoic chamber show that the retro-radiator based tag can reach a reading distance of 60 cm, which is longer than most of the existing chipless tags. In the measurement, the proposed tag was well detected even when the reader antennas were not at the boresight.">

Design and Analysis of Chipless RFID Tags Based on Retro-Radiators (original) (raw)

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