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19 April 2024 |
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Grating Lobe Suppression in Metasurface Antenna Arrays with a Waveguide Feed Layer | | Michael Boyarsky
; Mohammadreza F. Imani
; David R. Smith
; | | Date: |
23 May 2019 | | Abstract: | Metasurface antenna arrays, formed by tiling multiple metasurface
subapertures, offer an alternative architecture to electrically large
beamsteering arrays often used in radar and communications. The advantages
offered by metasurfaces are enabled by the use of passive, tunable radiating
elements. While these metamaterial elements do not exhibit the full range of
phase tuning as can be obtained with phase shifters, they can be engineered to
provide a similar level of performance with much lower power requirements and
circuit complexity. Due to the limited phase and magnitude control, however,
larger metasurface apertures can be susceptible to strong grating lobes which
result from an unwanted periodic magnitude response that accompanies an ideal
phase pattern. In this work, we combine antenna theory with analytical modeling
of metamaterial elements to mathematically reveal the source of such grating
lobes. To circumvent this problem, we introduce a compensatory waveguide feed
layer designed to suppress grating lobes in metasurface antennas. The waveguide
feed layer helps metasurface antennas approach the performance of phased arrays
from an improved hardware platform, poising metasurface antennas to impact a
variety of beamforming applications. | | Source: | arXiv, 1905.9846 | | Services: | Forum | Review | PDF | Favorites | |
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