Pwr dominos5/21/2023 ![]() Here we propose a innovative dual inverted-L periodical structure with excellent performance not only on the fundamental mode but also on a new upper mode. However, almost all of the earlier CSP structures are mainly focus on the fundamental mode characteristics, such as fundamental resonance frequency. In earlier research studies, we have recognized that electromagnetic field of CSP waveguide are always confined to a sub-wavelength area and have a strong potential to be applied in device designing. The proposed waveguide has excellent microwave and terahertz propagation and rejection characteristics, which may have great potential applications in various microwave and terahertz devices and circuits.Ī novel dual-band conformal surface plasmon (CSP) waveguide is designed and well studied in this paper. The numerical and experimental results are in good agreement, which further validates the proposed SSPP waveguide design. ![]() Then, a scaled microwave windmill-shaped waveguide prototype is fabricated and measured. The simulated results show that the whole waveguide has excellent transmission performance with S11 −1 dB from 0 THz to 5.68 THz, as well as a large out-of-band rejection response (S21 < −80 dB). To demonstrate the properties of the windmill-shaped SSPP waveguide, a tapered conversion is designed to connect the windmill-shaped SSPP waveguide and the microstrip for smooth momentum and impedance matching. Compared with the conventional comb-shaped and T-shaped SSPP waveguide units, the proposed windmill-shaped unit shows a lower asymptotic frequency and stronger field-confinement characteristics for the supported fundamental SSPP mode. The dependence of terahertz dispersion characteristics on geometrical parameters of the proposed waveguide is detailed and investigated. We propose a novel type of spoof surface plasmon polariton (SSPP) waveguide based on windmill-shaped units for high-efficiency microwave and terahertz propagation. The structure is less sensitive to the incident angle of magnetic waves and has a better broadband absorbing ability. The measurement results agree well with the simulation results, proving the reliability of the design and fabrication. The transmission response of the structure is measured in an anechoic chamber. As the incident angle of the electromagnetic wave increases to 40°, the absorption rate in the 15–20 GHz band decreases to 70% in the transverse electric (TE) mode, and the absorption rate in the transverse magnetic (TM) mode is almost the same as that of vertical incidence. The simulation results demonstrate that under normal incidence, the absorption rate of the structure remains 95% in the 5–30 GHz band, and the absorption rate is also 80% in the 3.5–5 GHz band. The transmission characteristics of the FSR are studied by full-wave simulation and equivalent circuit method. A periodic square cavity structure is formed. The FSR is composed of a multi-layer structure comprising frequency selective surface (FSS)-polyresin (PR)-indium tin oxide (ITO)-PR-FSS and placed vertically on a metal base plate. A broadband frequency selective rasorber (FSR) based on spoofsurface plasmon polaritons (SSPP) is proposed.
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