Computational Imaging With Dynamic Metasurfaces: A Recipe for Simple and Low-Cost Microwave Imaging

• DOI: 10.1109/map.2022.3169395
• Publication Date: 2022-05-19T20:25:27Z
• Authors: Timothy Sleasman; Mohammadreza F. I...; Aaron V. Diebold; Michael Boyarsky; Kenneth P. Trofatter; David R. Smith
• Keywords: Microwave Imaging; Computational photography; Aperture (computer memory)

We review the evolution of metasurface antennas for computational microwave imaging and highlight advantages disadvantages various configurations. As an illustrative example, we examine a system comprising dynamic printed cavities as modular building blocks. These can generate multitude spatially diverse, voltage-controlled illumination patterns, therefore encode scene's reflectivity distribution into set measurements that be postprocessed to produce image. single-port devices act transmitters (Txs) and/or receivers (Rxs) combined create electrically large aperture with reduced number (expensive cumbersome) radio-frequency (RF) components. Here, present some unique possibilities made possible by imager. Specifically, demonstrate high quality bandwidth operation—as narrow single frequency. then provide performance predictions case when are used image humans, might relevant in many security-screening applications. conclude describing outlook metasurfaces identifying several future directions.