A K-band, varactor-tuned dynamic metasurface aperture for microwave computational imaging

We present a substrate-integrated waveguide-fed metasurface design for K-band microwave computational imaging. Integration of varactors into each metamaterial element enables grayscale control of the element’s resonant response, allowing for increased flexibility in the attainable radiation patterns over those of a binary metasurface using PIN diodes. We describe the element design and performance, and give preliminary experimental results.