A circularly-polarized aperture array antenna with a corporate-feed hollow-waveguide circuit in the 60 GHz-band

The authors proposed a circular-polarized array antenna by using hexagonal radiating apertures in the 60 GHz-band. The hexagonal radiating aperture is designed, and the good axial ratio characteristics are achieved in the boresight. We analyze the full structure of the 16×16-element array that combines the 2×2-element subarrays and a 64-way divider. The reflection is less than −14dB over 4.9% bandwidth where the axial ratio is less than 2.5dB. High antenna efficiency of 88.7% is obtained at 61.5GHz with the antenna gain of 33.3dBi including losses. The 1dB-down gain bandwidth is 6.8%.

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