Abstract
This paper presents three array configurations of chipless RFID tags for read range enhancement. A chipless RFID tag with eleven nested octagonal-shaped resonators is proposed. The proposed single element tag can encode 10 bits and has a read range of 1.20 m with a spectral efficiency of 1.821 bits/GHz and spatial efficiency of 2.066 bits/cm2. For further improvement of the tag read range, array configuration is utilized. A read range of 2.20 m, 3.20 m, and 4.20 m is achieved by 2x2, 3x3, and 4x4 array. The proposed chipless RFID tag is designed on an ultrathin substrate (0.15 mm) that provides conformability to the tag. A good agreement between the simulated and measured results is obtained.
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