Rapid Prototyping of Anomalous Reflective Metasurfaces Using Spray-Coated Liquid Metal

Author:

Manio Glan Allan V.1ORCID,Kouchi Matthew T.1,Dacuycuy Saige J.1ORCID,Ohta Aaron T.1ORCID,Shiroma Wayne A.1ORCID

Affiliation:

1. Department of Electrical and Computer Engineering, University of Hawai’i at Mānoa, Honolulu, HI 96822, USA

Abstract

Reconfigurable intelligent surfaces (RISs) have the potential to improve wireless communication links by dynamically redirecting signals to dead spots. Although a reconfigurable surface is best suited for environments in which the reflected signal must be dynamically steered, there are cases where a static, non-reconfigurable anomalous reflective metasurface can suffice. In this work, spray-coated liquid metal is used to rapidly prototype an anomalous reflective metasurface. Using a pressurized air gun and a plastic thin-film mask, a metasurface consisting of a 6 × 4 array of Galinstan liquid–metal elements is sprayed within minutes. The metasurface produces a reflected wave at an angle of 28° from normal in response to a normal incident 3.5-GHz electromagnetic plane wave. The spray-coated liquid–metal metasurface shows comparable results to an anomalous reflective metasurface with copper elements of the same dimensions, demonstrating that this liquid–metal fabrication process is a viable solution for the rapid prototyping of anomalous reflective metasurfaces.

Funder

U.S. National Science Foundation

Publisher

MDPI AG

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