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Compact Wideband Circularly Polarized Patch Antenna Array Using Self-Sequential Rotation Technology
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DOI：10.1109/LAWP.2022.3142307.png)
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Abstract
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In this letter, a compact wideband circularly polarized patch antenna array is proposed to cover the 57-71 GHz hand. The antenna array is constructed by 45 degrees inclined slits loaded circular radiating patches with rectangular back cavities, two-layer sequential rotation feed networks, and a waveguide transition. Novel self-sequential rotation technology is introduced using a dual-high-order-mode cavity to improve the axial ratio (AR) and impedance bandwidths of the subarray. Compared with conventional sequential rotation feed networks, the proposed feeding scheme provides higher aperture efficiency. A 4 x 4 patch antenna array is fabricated using standard printed circuit board technology. Measured results show that the -10 dB impedance and 3 dB AR overlapped bandwidth is 23.8% (57-723 GHz). The measured peak gain is 20.5 dBic with an aperture efficiency of 87.7% at 66 GHz.
Keywords:
Circular polarization (CP)
dual-high-order-mode cavity
high gain
self-sequential rotation technique
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