4.7 Article

Multibeam Si/GaAs Holographic Metasurface Antenna at W-Band

Journal

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 69, Issue 6, Pages 3523-3528

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2020.3030898

Keywords

Gallium arsenide; Apertures; Silicon; Phased arrays; Antenna; beam shaping; gallium arsenide; holography; metamaterial; metasurface; millimeter-wave; silicon

Funding

  1. Advanced Component Technology (ACT) Program

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The silicon-gallium arsenide semiconductor-based holographic metasurface antenna can operate at 94 GHz, using holographic approach to modulate guided-mode generated by a pillbox beamformer with three independent beams for beam steering. The antenna is planar and extremely low-profile, suitable for small platforms.
We demonstrate a silicon (Si)-gallium arsenide (GaAs) semiconductor-based holographic metasurface antenna operating at 94 GHz. The metasurface antenna molds the radiated beam by resorting to a holographic approach involving the modulation of a guided-mode generated by a pillbox beamformer. The pillbox beamformer is fed by three integrated horns in substrate-integrated waveguide (SIW) technology located in the focal plane of the parabolic reflector of the pillbox beamformer. The three horns correspond to three independent beams and allow beam steering by switching from one feed to another. The proposed metasurface antenna is planar and extremely low-profile, thus suitable for small platforms such as CubeSats/SmallSats. A prototype validates the concept demonstrating a directivity as high as 31.9 dBi and a reflection coefficient lower than -15 dB at 94 GHz.

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