One application projected to move higher in frequency—radio-frequency-identification (RFID) tags—may fit numerous applications at millimeter-wave frequencies. First, though, compact RFID reader antennas with high axial ratios and fan-shaped radiation patterns need to be developed for use at frequencies between 57 and 64 GHz. In pursuit of such RFID antennas, a team from Monash University (Clayton, Australia) investigated the design of compact array antennas for use with chipless RFID tags...
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