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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
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Grating lobe suppression in metasurface antenna arrays with a waveguide feed layer
Optics Express
|August 6, 2020
Summary
Metasurface antennas use tunable elements for efficient beamsteering. A new waveguide feed layer suppresses grating lobes, improving performance for radar and communications applications.
Area of Science:
- Electromagnetics and antenna theory
- Metamaterials and artificial structures
Background:
- Metasurface antennas offer a low-power, less complex alternative to traditional beamsteering arrays.
- Metamaterial elements provide tunable radiating properties but have limited phase control.
Purpose of the Study:
- To mathematically identify the source of grating lobes in metasurface antennas.
- To introduce a novel method for suppressing these grating lobes.
Main Methods:
- Combined antenna theory with analytical modeling of metamaterial elements.
- Developed a compensatory waveguide feed layer to mitigate grating lobe effects.
Main Results:
- Identified the periodic magnitude response as the cause of grating lobes.
- Demonstrated that the waveguide feed layer effectively suppresses grating lobes.
Conclusions:
- The waveguide feed layer significantly enhances metasurface antenna performance.
- This advancement positions metasurface antennas for broader impact in beamforming applications.
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