# Radomizing an Antenna for a SAR-Based ETA Radar System While Ensuring Imaging Accuracy: A Focus on Phase Shifts

## TL;DR

This paper studies how radomizing a millimeter-wave antenna affects its performance in a SAR-based radar system, focusing on phase shifts rather than amplitude.

## Contribution

The study introduces and evaluates metasurface-based radomization for SAR radar antennas, emphasizing phase shift effects.

## Key findings

- Three radomization methods were tested for a 24.05–24.25 GHz radar antenna.
- The metasurface-based radome outperformed other radomization approaches in image quality.
- Phase shifts across beamwidth and bandwidth were prioritized over amplitude in the analysis.

## Abstract

The impact of radomization on the radiation pattern of a millimeter-wave antenna for an ETA system utilizing synthetic aperture radar (SAR) is examined with special emphasis placed on the phase shift across both the beamwidth and the bandwidth, rather than the amplitude. Three different radomization approaches, including one based on metasurfaces, are evaluated for a radar antenna operating within the 24.05–24.25 GHz frequency range. Fabricated prototypes, both of the standalone antenna and the radomized version, are tested and compared in terms of electromagnetic image quality. The metasurface-based radome provides the best results among the radomization options analyzed.