Towards frequency-diverse computational imaging with cRR-based metasurfaces for ground penetrating radar

Ground penetrating radar (GPR) is a well-established technology for detecting buried targets using electromagnetic waves at microwave frequencies. In addition, by resorting to synthetic aperture radar (SAR) techniques, high-resolution radar images of the subsurface can be retrieved. However, this requires gathering measurements across the whole inspected scene, at a dense sampling rate, which results in a slow survey speed. To address this challenge, single-channel computational imaging (CI) systems relying on compressive antennas have been successfully employed for free-space scenarios. In this contribution, a compressive metasurface-based antenna populated with complementary ring resonators and specifically designed for GPR applications is presented. Simulation results show that with this antenna, buried targets can be imaged from a single acquisition.