This paper presents a metasurface (MTS) beam-former based on Reflecting Luneburg Lenses (RLLs) operating in the sub-THz range. RLLs consist of two circular parallel plate waveguides (PPWs) vertically stacked. The bottom wall of the lower PPW is loaded with a MTS with an axially symmetric modulation. The wave launched by a primary feed in the bottom PPW is collimated in the top one, so that a plane wave is identically generated for any azimuthal position of the source. The proposed solution uses a bed of nails, well-suited to fabrication by Si micromachining, to implement the RLL refractive index profile. Simulation results yield a 30% -3dB directivity bandwidth around the center frequency (280 GHz). This device can be used as a beam-former for multi-beam antennas for Earth observation or for front- and back-hauling in beyond 5G wireless.
Bilitos, C., Ruiz-Garcıa, J., Sauleau, R., Martini, E., Maci, S., Gonzalez-Ovejero, D. (2021). Metal-only Reflecting Luneburg Lens Design for Sub-THz Applications. In 2021 International Symposium on Antennas and Propagation (ISAP) (pp.1-2). New York : IEEE [10.23919/ISAP47258.2021.9614591].
Metal-only Reflecting Luneburg Lens Design for Sub-THz Applications
Martini, E.;Maci, S.;
2021-01-01
Abstract
This paper presents a metasurface (MTS) beam-former based on Reflecting Luneburg Lenses (RLLs) operating in the sub-THz range. RLLs consist of two circular parallel plate waveguides (PPWs) vertically stacked. The bottom wall of the lower PPW is loaded with a MTS with an axially symmetric modulation. The wave launched by a primary feed in the bottom PPW is collimated in the top one, so that a plane wave is identically generated for any azimuthal position of the source. The proposed solution uses a bed of nails, well-suited to fabrication by Si micromachining, to implement the RLL refractive index profile. Simulation results yield a 30% -3dB directivity bandwidth around the center frequency (280 GHz). This device can be used as a beam-former for multi-beam antennas for Earth observation or for front- and back-hauling in beyond 5G wireless.
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https://hdl.handle.net/11365/1320715