研究目的
To design a kind of dual-band three-dimensional (3-D) frequency selective surfaces (FSSs) based on multiple square coaxial waveguides (SCWs) that can achieve small band ratio, high selectivity, angular stability, and dual polarizations.
研究成果
A kind of dual-band 3-D FSSs based on multiple SCWs are proposed. The closely-spaced FSS is presented by employing three square metallic tubes, which realizing a stable dual-bandpass response. And then, the highly-selective FSS with multiple transmission zeros/poles is designed by the centered gaps etched on the tubes. The operating principle of the proposed 3-D FSSs has been explained by the E-field analysis of the transmission zeros/poles. The simulated results show that two proposed dual-band 3-D FSSs can exhibit small band ratio, high selectivity, angular stability, dual polarizations, and compact unit cell.
研究不足
The paper does not explicitly mention the limitations of the research.
1：Experimental Design and Method Selection:
The design involves creating a closely-spaced 3-D FSS and a highly-selective 3-D FSS based on multiple SCWs. The methodology includes the use of square slot resonances in SCW propagation paths and a parallel-plate waveguide (PPW) propagation path for generating transmission poles.
2：Sample Selection and Data Sources:
The unit cell of the proposed FSS consists of three propagation paths supported by square metallic tubes combined with dielectric materials.
3：List of Experimental Equipment and Materials:
Full-wave simulator HFSS is used for simulation. The materials include square metallic tubes and dielectric materials with specified relative dielectric constants.
4：Experimental Procedures and Operational Workflow:
The design process involves the creation of SCW paths and PPW paths, followed by simulation to analyze the frequency response under different incident angles for both TE and TM polarizations.
5：Data Analysis Methods:
The E-field distributions at frequencies of the transmission zeros/poles are investigated to explain the operating principle of the proposed FSSs.
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