Low Sidelobe Antenna Based on Single-Substrate Transmissive Metasurface
2023 Cross Strait Radio Science and Wireless Technology Conference (CSRSWTC)(2023)
Abstract
In this article, a transmissive metasuiface(MS) that can independently control the transmission phase and amplitude of linearly polarized wave is proposed. The MS element consists of a single-substrate and two layers of metal. It achieves 360° phase coverage while maintaining high transmission amplitude. Based on the element, a phase-modulated MS antenna operating at 14.5 GHz is designed, achieving a high gain of 21.7 dB. Building upon the first antenna, amplitude modulation is used to improve the sidelobe level (SLL) of the
$\boldsymbol{yoz}$
plane. Compared with the phase-control MS, the amplitude-phase controlled MS attains approximately a 6 dB SLL suppression by sacrificing a 1.4 dB main-lobe gain. The proposed MS offers advantages such as simple structure, low profile, and high gain.
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Key words
transmissive metasurface,phase coverage,high gain,SLL
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