研究目的
To design and develop a high-gain, wideband, low-radar-cross-section (RCS) circularly polarized (CP) patch array antenna using a chessboard polarization conversion metasurface (CPCM) for applications in stealth platforms.
研究成果
The proposed antenna achieves a 3-dB axial ratio bandwidth of 3.5 GHz (9.5-13 GHz), an impedance bandwidth of 3.3 GHz (9.5-12.8 GHz), a peak gain of 13.4 dBiC, and wideband RCS reduction from 6 to 15 GHz (except 12-13 GHz). It demonstrates improved performance over existing designs, with potential applications in X/Ku bands for stealth systems. Future work could focus on broadening the RCS reduction bandwidth and further optimizing the design for practical deployment.
研究不足
The RCS reduction is not effective in the frequency range of 12-13 GHz, indicating a limitation in the bandwidth of RCS reduction. Fabrication complexity and potential issues with polarization purity in practical implementations may also be constraints.
1：Experimental Design and Method Selection:
The study employs a three-layer polarization conversion metasurface (PCM) structure to achieve polarization conversion from linear to circular polarization. A Fabry–Pérot (FP) cavity is used for gain enhancement, and a chessboard configuration of PCMs is adopted for wideband RCS reduction through phase cancellation of reflected waves from adjacent PCMs. Theoretical models and simulations are used to optimize the design.
2：Sample Selection and Data Sources:
The antenna prototype is fabricated based on optimized dimensions, using FR4 substrate with specific permittivity and loss tangent. Measurements are conducted on the fabricated antenna.
3：List of Experimental Equipment and Materials:
Equipment includes a vector network analyzer (Agilent Model E8361A) for S-parameter measurements and an anechoic chamber with a normal-gain horn antenna for radiation pattern and axial ratio measurements. Materials include FR4 substrate (ε_r = 4.4, tan δ = 0.02) and metallic parts for the PCM structure.
4：4, tan δ = 02) and metallic parts for the PCM structure.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The antenna is fabricated according to the design. S11 parameters are measured using the vector network analyzer. Radiation patterns, gain, and axial ratio are measured in the anechoic chamber by comparing with a reference horn antenna. Scattering characteristics are simulated and analyzed.
5：Data Analysis Methods:
Data is analyzed using simulation software (not specified) and standard formulas from literature for radiation and scattering properties. Comparisons are made between simulated and measured results to validate performance.
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