Abstract
In this paper, two double E-shaped triple band array antennas operating at centimetre band are proposed for a radio-frequency identification (RFID) system. One of the proposed antennas provides resonance at frequencies of 7.23 GHz, 10 GHz and 11.748 GHz, while the other has resonance at 7.23 GHz, 9.1 GHz and 10.5 GHz. Both the antennas are moderately small sized with dimensions of 86.584 mm by 35.117 mm. At the highest resonance frequency, the first antenna has bandwidth 362 MHz and gain 8.13 dB, while the other has bandwidth 295 MHz and gain of 7.97 dB. These antennas are placed in an RFID system using orthogonal frequency division multiplexing (OFDM) modulation with non-orthogonal multiple access (NOMA). The bit error rate performance of RFID systems using the proposed array antennas is simulated for outdoor multipath fading channels. Results indicate the suitability of the array antennas in a NOMA-OFDM RFID scenario.
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