期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 68, 期 10, 页码 7046-7055出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2020.2995417
关键词
Apertures; Transmitting antennas; Broadband antennas; Feeds; Gain; Wideband; Antenna arrays; periodic structures; polarization rotation; transmitarrays; wideband antennas
A wideband transmitarray antenna exploiting 1 bit polarization-rotation unit cell is proposed in this article. 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 a wide frequency band, resulting in a flat gain response. To verify the design concept, a 13 x 17-element (195 mm x 255 mm) antenna prototype is fabricated and measured with a 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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