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Radomizing an Antenna for a SAR-Based ETA Radar System While Ensuring Imaging Accuracy: A Focus on Phase Shifts
María Elena de Cos Gómez1, Alicia Flórez Berdasco1, Jaime Laviada Martínez1
1TSC, Electrical Engineering Department, University of Oviedo, 33203 Gijón, Spain.
Micromachines
|June 27, 2025
Summary
Radomization impacts millimeter-wave antenna radiation patterns for synthetic aperture radar (SAR) systems. Metasurface radomes offer superior performance for enhanced electromagnetic image quality in radar applications.
Area of Science:
- Electromagnetics and Antenna Engineering
- Radar Systems and Signal Processing
Background:
- Millimeter-wave antennas are crucial for Earth Observation (EO) systems, particularly synthetic aperture radar (SAR).
- Radomization techniques are explored to mitigate performance degradation in radar antennas operating at specific frequencies.
Purpose of the Study:
- To investigate the effect of radomization on the radiation pattern of a millimeter-wave antenna for SAR systems.
- To evaluate different radomization approaches, focusing on phase shift characteristics across beamwidth and bandwidth.
Main Methods:
- Three radomization techniques, including a metasurface-based approach, were applied to a 24.05-24.25 GHz radar antenna.
- Fabricated antenna prototypes (standalone and randomized) were tested.
- Electromagnetic image quality was assessed to compare performance.
Main Results:
- The metasurface-based radome demonstrated the most effective performance among the evaluated methods.
- Phase shift variations were analyzed across the antenna's beamwidth and bandwidth.
- The study quantified the impact of radomization on overall antenna performance.
Conclusions:
- Metasurface radomes represent a promising solution for optimizing millimeter-wave antenna performance in SAR systems.
- Careful consideration of radomization is essential for maintaining antenna fidelity in radar applications.
- The findings provide valuable insights for the design of advanced radar systems.
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