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We present the design, fabrication, and experimental characterization of atwo-dimensional, dynamically tuned, metasurface aperture, emphasizing itspotential performance in computational imaging applications. The dynamicmetasurface aperture (DMA) consists of an irregular, planar cavity that feeds amultitude of tunable metamaterial elements, all fabricated in a compact,multilayer printed circuit board process. The design considerations for themetamaterial element as a tunable radiator, the associated biasing circuitry,as well as cavity parameters are examined and discussed. A sensing matrix canbe constructed from the measured transmit patterns, the singular value spectrumof which provides insight into the information capacity of the apertures. Weinvestigate the singular value spectra of the sensing matrix over a variety ofoperating parameters, such as the number of metamaterial elements, number ofmasks, and number of radiating elements. After optimizing over these keyparameters, we demonstrate computational microwave imaging of simple testobjects.

Implementation and Characterization of a Two-Dimensional Printed Circuit Dynamic Metasurface Aperture for Computational Microwave Imaging