Abstract
A 2 × 2 sequentially rotated antenna array with high gain and wide axial ratio (AR) bandwidth is designed. The antenna element consists of a microstrip patch fed with a series power divider through four L-shaped probes. Low AR ≤ 1 dB is guaranteed by reiterating the employment of the series power divider at the array level, and optimizing the antenna element impedance matching bandwidth performance. A prototype of the antenna array is manufactured for the ultrahigh frequency radio frequency identification bandwidth, with overall size 1.32 × 1.32 × 0.065 λ3. Measurement shows a S 11 ≤ −10 dB bandwidth of 36.5% (0.76–1.1 GHz), an AR ≤ 3 dB bandwidth of 28.8% (0.823–1.1 GHz) with AR ≤ 1 dB within 0.846–1.015 GHz (18.2%). Moreover, a peak gain of 13.2 dBic, and a 3 dB gain bandwidth of 26.1% are observed. The presented antenna exhibits outstanding AR performance and high gain despite its low design and implementation complexity.
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