Varactor controlled X-band passive RIS optimization

Hlib Zadorozhnyi; Finn-Niclas Stapelfeldt; Dmytro Vasylenko; Vadim Issakov

doi:10.3103/S0735272722110012

Authors

Hlib Zadorozhnyi National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine https://orcid.org/0009-0004-6882-8709
Finn-Niclas Stapelfeldt Technische Universität Braunschweig, Braunschweig, Germany https://orcid.org/0000-0001-6013-5108
Dmytro Vasylenko National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine https://orcid.org/0000-0002-2114-6629
Vadim Issakov Technische Universität Braunschweig, Braunschweig, Germany https://orcid.org/0000-0003-3450-8745

DOI:

https://doi.org/10.3103/S0735272722110012

Keywords:

metasurface, RIS, unit cell, phase span, reflection losses, bandwidth, optimization goals, X-band, 6G

Abstract

Reconfigurable intelligent surface (RIS) is one of the possible solutions to overcome challenges that bring up the 6G communication networks. Unit cell design for RIS is similar in many aspects to the design of artificial magnetic conductors (AMC) because both have a common nature of changing the phase of the reflected wave. However, RIS is aimed at controlling the angle of reflection to maintain requirements for the radiation pattern similar to phased antenna arrays such as low side lobes and beamwidth. The paper reviews the criteria for optimizing RIS: unit cell dimensions, phase span, frequency bandwidth, and loss. An optimization algorithm is proposed for the proper accounting of RIS optimization criteria. A new X-band unit cell is designed using the proposed optimization algorithm.

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