研究目的
To design a low radar cross section (RCS) planar antenna using a phase gradient metasurface that operates in the X-band with frequency scanning capabilities and significant RCS reduction for arbitrary polarized incident waves.
研究成果
The proposed frequency scanning PGM antenna achieves significant RCS reduction and low profile with coplanar feeding. Measurement results confirm simulation predictions, showing beam steering from 16.4° to 12.7° and RCS reductions over 22 dB and 30 dB for y-polarized and x-polarized incidences, respectively. Future work could focus on improving efficiency and broadening the scanning range.
研究不足
The antenna has a limited frequency scanning range (from 9.75 GHz to 10.25 GHz), and the aperture efficiency is relatively low (about 15% at 10 GHz). The RCS reduction is effective but may vary with polarization and frequency outside the operating band.
1：Experimental Design and Method Selection:
The antenna design is based on a phase gradient metasurface (PGM) composed of H-shaped sub-elements to provide a bridge between feeding waves and radiation waves, utilizing the generalized reflection law for beam steering and RCS reduction.
2：Sample Selection and Data Sources:
The PGM is fabricated and measured, with simulations performed using CST Microwave Studio software.
3：List of Experimental Equipment and Materials:
Substrate with permittivity
4：5(1+025i), H-shaped metal elements, parallel plate waveguide power divider, and measurement setup for S-parameters, radiation patterns, and RCS. Experimental Procedures and Operational Workflow:
The PGM is designed with specific geometric parameters, simulated for reflection phases and power flow, fabricated, and then measured for S11, radiation patterns, and monostatic RCS compared to a PEC board.
5：Data Analysis Methods:
Simulation results are compared with measured data to validate performance, including radiation direction calculations and efficiency analysis.
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