研究目的
To design a dual-band composite wideband absorbing material (WAM) for reducing the in-band radar cross section (RCS) of broadband antennas, specifically targeting C and X bands.
研究成果
The dual-band composite WAM based on FSS significantly broadens the absorbing bandwidth to 112% and achieves over 90% absorption rates over C and X bands. When applied as the ground plane of a Vivaldi antenna, it provides substantial RCS reduction from 2–18 GHz and over wide incident angles, with minimal impact on radiation performance. The method proves effective for in-band antenna RCS reduction over broadband and wide angular ranges.
研究不足
The study focuses on C and X bands, and while significant RCS reduction is achieved, there are minor discrepancies between simulated and measured results due to fabrication tolerances and measurement uncertainties.
1：Experimental Design and Method Selection:
The study involves designing a composite WAM with an upper layer of traditional absorber and a lower layer of dual-band FSS. The FSS is formed by a square ring and an improved Jerusalem cross structure. The design aims to broaden the absorbing bandwidth and enhance absorption rates over C and X bands.
2：Sample Selection and Data Sources:
The composite WAM is applied as the ground plane of a Vivaldi antenna to evaluate its performance in RCS reduction.
3：List of Experimental Equipment and Materials:
Substrate FR4 with specific permittivity and loss tangent, gummed rubber AM (TP-15D), and simulation software HFSS.15 are used.
4：Experimental Procedures and Operational Workflow:
The study includes simulation and measurement of reflection coefficients, absorption rates, and RCS reduction. The Vivaldi antenna's radiation and scattering characteristics are evaluated with and without the composite WAM.
5：Data Analysis Methods:
The performance is analyzed based on reflection coefficients, absorption rates, and RCS reduction measurements. Comparisons are made between simulated and experimental results.
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