On the Aperture Size of Digitally Coded Metasurfaces for Beam Steering Applications using Anomalous Reflection

Malleboina, R and Dash, JC and Lemma, A and Sarkar, D (2023) On the Aperture Size of Digitally Coded Metasurfaces for Beam Steering Applications using Anomalous Reflection. In: 1st International Microwave and Antenna Symposium, IMAS 2023, 7 - 9 February 2023, Cairo, pp. 255-258.

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Abstract

This paper investigates the minimum size of the metasurface needed for beam steering applications using anomalous reflection. First, using 1-bit and 2-bit digitally coded unit cells, we analytically model a programmable metasurface in MATLAB for a reflected beam direction of θr=30°, φr=0°, and perform the far-field radiation pattern analysis for different aperture sizes. We observe the metasurface size of 10λ0× 10λ0 (where λ0 is the free-space wavelength at 10.5 GHz) provides anomalous reflection in the desired direction having beamwidth of nearly 5° for both 1-bit and 2-bit coding. We verify the reflection angle and half-power beamwidth (HPBW) obtained from the analytical method with the full-wave electromagnetic simulation using CST Microwave Studio. It is also observed that the 2-bit coded metasurface having 10λ0× 10λ0 size provides a far-field pattern with a reduced sidelobe level (SLL) of nearly -11.54 dB compared to 1-bit.

Item Type:	Conference Paper
Publication:	2023 International Microwave and Antenna Symposium, IMAS 2023
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Electromagnetic simulation; Waveform analysis, Anomalous reflection; Aperture sizes; Beam-steering; Coded units; Digital metasurface; Metasurface; Passive metasurface; Reflected beam; Unit cells, MATLAB
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	25 May 2023 03:42
Last Modified:	25 May 2023 03:42
URI:	https://eprints.iisc.ac.in/id/eprint/81526

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