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Polarization independent quad-bandpass frequency selective surfaces with wide-band ratio
摘要： A single layer polarization independent quad-bandpass frequency selective surface (FSS) with wide-band ratio is demonstrated theoretically as well as experimentally. The proposed structure passes four frequency bands with wide band ratio. The proposed FSS design is implemented by incorporating alternate arrangement of four units which are rotated 90° clockwise to form a unit cell of metal over a FR4 substrate. The geometrical dimensions of proposed unit cell are optimized and arranged in such a way that the structure possesses the quad bandpass characteristic and aspect dimensions of one unit is 0.11λ × 0.11λ with respect to first resonant frequency. This FSS provides stable response for different angle of incidence in transverse electric (TE) mode and transverse magnetic (TM) mode. To validate the results proposed FSS array has been fabricated and measured in free space environment. The measured results are in good agreement with the simulated results. Excellent stability is also observed for different incident angle.
关键词： quad bandpass,polarization independent,frequency selective surface,band ratio
更新于2025-09-23 15:23:52
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[IEEE 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA) - Granada, Spain (2019.9.9-2019.9.13)] 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA) - 3-D dual-band FSSs based on multiple square coaxial waveguides
摘要： In this paper, a kind of dual-band three-dimensional (3-D) frequency selective surfaces (FSSs) based on multiple square coaxial waveguides (SCWs) are proposed. Through a simple design, transmission poles are intrinsically produced by the square slot resonances in two SCW propagation paths, and another transmission pole is generated by a parallel-plate waveguide (PPW) propagation path. With the help of these three transmission poles, a closely-spaced dual-band 3-D FSS can be achieved with the band ratio 1.118. In order to further extend the application of the proposed structure, a modified design is then exhibited. One pair of short SCW resonant elements is created in each SCW propagation path. As a result, each SCW propagation path can provide two transmission poles for a flat passband by the odd- and even-mode coupling. Moreover, the transmission zeros are located at each sides of passbands, leading to both-sided sharp roll off. The unit cell size of the modified design is reduced remarkably. The E-field analysis of transmission zeros/poles is given to explain the operating principle of two proposed FSSs. The simulated results show that the proposed FSSs can achieve stable responses to variations of incident angle from 0° to 45° for both TE and TM polarizations.
关键词： frequency selective surface (FSS),band ratio,dual-band,high selectivity,square coaxial waveguides (SCWs)
更新于2025-09-19 17:13:59