By leveraging metamaterials and compressive imaging, a low-profile aperture capable of
microwave imaging without lenses, moving parts, or phase shifters is demonstrated. This designer
aperture allows image compression to be performed on the physical hardware layer rather than in
the postprocessing stage, thus averting the detector, storage, and transmission costs associated
with full diffraction-limited sampling of a scene. A guided-wave metamaterial aperture is used
to perform compressive image reconstruction at 10 frames per second of two-dimensional (range
and angle) sparse still and video scenes at K-band (18 to 26 gigahertz) frequencies, using
frequency diversity to avoid mechanical scanning. Image acquisition is accomplished with a 40:1
compression ratio.
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