A Wideband, 1 bit Transmitarray Antenna Design With Flat Gain Response

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Abstract
A wideband transmitarray antenna exploiting 1-bit polarization-rotation unit cell is proposed in this paper. A printed antipodal fermi tapered slot antenna is introduced as the source feed. Considering the radiation characteristics of the source feed, system-level performances in terms of spillover, illumination, and aperture efficiencies are analyzed, revealing the inherent restriction of wideband operation. In order to obtain wideband performance, a novel three-layer polarization-rotation 1-bit unit cell is developed to introduce phase errors over the aperture, which act as one kind of degree-of-freedom during the system design. An optimization method is employed to further balance the overall phase errors experienced over wide frequency band, resulting in flat gain response. To verify the design concept, a 13 × 17 -element ( 195 mm × 255 mm ) antenna prototype is fabricated and measured with realized gain of 22.5 dBi at 10 GHz and 1-dB fractional gain bandwidth of 37% achieved, demonstrating great potentials in many communication applications.

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