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A Convoluted Structure for Miniaturized Dual-stopband Frequency Selective Surface
摘要： A miniaturized dual-bandstop frequency selective surface (FSS) using convoluted structures is proposed in this letter. The working central frequencies of the proposed FSS are 2.66 GHz and 5GHz with -3dB bandwidths of 1.5 GHz and 1.2 GHz respectively. The side length of the unit cell is 6.88mm which is about 5.9% of the wavelength at the first working frequency. The equivalent circuit and current distributions are introduced to explain the FSS frequency performance. The effects of the geometrical parameters on the frequency response of the FSS are studied. The simulated results show that the ratio of the frequencies of the two working transmission zeros can be tuned over a wide range. A prototype of the proposed FSS is fabricated and measured. The simulation and measured results show that the working frequencies, the bandwidths of the passband and two stopbands of the the proposed FSS perform excellent stabilities under different polarizations and incidence angles. This FSS is a good candidate to isolate the wireless networks.
关键词： Frequency selective surface(FSS),Miniature unit cell,Dual-band
更新于2025-09-19 17:15:36
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A novel miniaturized frequency selective surface
摘要： A novel single layer miniaturized frequency selective surface made of circular unit cell elements is presented in this article. The frequency selective surface (FSS) unit cell measures 0.055λ0 × 0.055λ0, where λ0 corresponds to its free space wavelength. The proposed FSS offers band stop characteristics with bandwidth of 137.5 MHz centered at 1.39 GHz. The symmetrical structure of the unit cell elements provides polarization independency. The miniaturized unit cell elements help achieving angular independency for both TE and TM mode of polarization. The miniaturized design provides excellent angular independency with negligible frequency shift for varying incident angles. A prototype of the FSS is fabricated and its simulation results are validated using measurements.
关键词： polarization,frequency selective surfaces (FSS),miniaturization
更新于2025-09-19 17:15:36
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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
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[IEEE 2019 IEEE 69th Electronic Components and Technology Conference (ECTC) - Las Vegas, NV, USA (2019.5.28-2019.5.31)] 2019 IEEE 69th Electronic Components and Technology Conference (ECTC) - Fully Additively Manufactured Tunable Active Frequency Selective Surfaces with Integrated On-package Solar Cells for Smart Packaging Applications
摘要： A ?rst-of-its-kind fully inkjet-printed electronically tunable active ?exible frequency selective surface (FSS) using varactors with integrated on-package solar cells is presented in this paper. Each varactor is biased by a dedicated on-package inkjet-printed solar cell using a low-temperature fabrication process. The solar cell changes its output voltage with variation in light intensities that eventually leads to a change in capacitance of the varactor and overall frequency response of the FSS. The proposed design eliminates the use of labor intensive biasing network, bulky power supply and micro-controllers to tune the FSS frequency response. These structures presents an autonomous, ultra low cost on-package RF shielding mechanism for next-generation of system-on-chip packaging applications that can be tuned on-demand at different frequency bands by simple variation of incident light intensities. Thus making them useful for a wide range of terrestrial, outer-space and EMI shielding applications.
关键词： Additive manufacturing,tunable FSS,solar cells,Frequency selective surfaces,varactors,tunable RF structures,inkjet printing
更新于2025-09-16 10:30:52
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Design and Analysis of Wideband Low-Scattering Endfire Antenna Using Moth Tail-Inspired Metamaterial Absorber and Surface Waveguide
摘要： This paper presents a wideband endfire antenna co-designed with broadband low-scattering characteristics. The wideband reflection and endfire radiation attribute the success to the supported dual-resonance surface waves, and the broadband low scattering owes to the combination of a metamaterial absorber (MA) absorption and an incident penetration of a frequency selective surface (FSS). Based on the transmission line model, a surface waveguide (SWG) which can support dual-resonance surface waves is adopted and analyzed to realize the wideband reflection response (4.95 ~ 6.83 GHz) and endfire radiation. Also, the SWG can be seen as an FSS for the normal incidence. In addition, a wideband MA, which is inspired by the luna moth's escape from bat attack, is designed and integrated with the SWG to realize low back radar cross section (RCS) in the frequency range from 0.5 to 12.5 GHz. The reflection, radiation and scattering performance are validated by the full-wave simulation and experimental verification.
关键词： Frequency selective surface (FSS),radar cross section (RCS),surface wave,moth tail-inspired metamaterial absorber (MA)
更新于2025-09-16 10:30:52
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[IEEE 2018 IEEE MTT-S International Microwave and RF Conference (IMaRC) - Kolkata, India (2018.11.28-2018.11.30)] 2018 IEEE MTT-S International Microwave and RF Conference (IMaRC) - 3D Frequency Selective Surfaces based on Substrate Integrated Waveguide Technology
摘要： In this paper, a novel design technique for designing 3D frequency selective surfaces (FSS) is proposed based on substrate integrated waveguide (SIW) cavity technology. The proposed design comprises of two tightly coupled FSS elements through the series of periodically spaced metallic vias which are separated a by a finite gap. The structure exhibits passbands characteristics with a relative bandwidth of 14.14%. Further, it exhibits two sharp roll-off performance characteristics on either edges of transmission frequency with two transmission zeros. The parametric study has been conducted to analyze its effect on frequency response of the structure. Furthermore, the material characteristics are derived to analyze the material behavior of the structure.
关键词： 3D FSS,Substrate integrated waveguide,Electromagnetic materials,reflection coefficient,transmission coefficient,EM wave propagation,Frequency selective surface (FSS)
更新于2025-09-12 10:27:22
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Dual-bandpass 3-D FSS with close band spacing based on multiple square coaxial waveguides
摘要： A three-dimensional (3-D) frequency selective surface (FSS) based on multiple square coaxial waveguides (SCWs) is proposed, which realizes a dual-bandpass response with close band spacing. In the unit cell of the proposed 3-D FSS, two concentric SCW propagation paths and one parallel-plate waveguide (PPW) propagation path are constructed by utilizing three square metallic tubes. Each SCW propagation path intrinsically generates one transmission pole by the square slot resonance, and the PPW propagation path produces another transmission pole by the half-wavelength resonance. In addition, two transmission zeros are introduced due to the counteraction of out-of-phase signals between di?erent paths, improving the frequency selectivity. After properly adjusting the design parameters, two desired passbands are obtained around 4.4 and 4.845 GHz, and the band ratio is only 1.1. Through the electric-?eld distributions, equivalent circuit model and parameters study, the operating principle of the proposed 3-D FSS is investigated. A prototype of the proposed 3-D FSS is fabricated and measured. The measured results show that the proposed design can achieve a stable response under the incident angles up to 45° for both TE and TM polarizations.
关键词： square coaxial waveguides (SCWs),frequency selective surface (FSS),dual-bandpass,dual-polarized,close band spacing
更新于2025-09-12 10:27:22
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Obtaining Directly Quasi-Square Open Ring FSS Constitutive Effective Parameters by Using Coupled WCIP - Retrieval Method
摘要： We propose here a method witch analyze the behavior of Quasi-square open ring frequency selective surface (FSS) by using an approach based on the wave iterative concept procedure method (WCIP) coupled to Retrieval from Scattering Parameters method . The scattering parameters calculated by WCIP for a Quasi-square open ring FSS are used, in analytical formulas, to calculate directly observable effective constitutive parameters (relative electric permittivity εreff , magnetic permeability μreff and refractive index n ) of a frequency selective surface. Results of effective constitutive parameters for a Quasi-square open ring FSS structure are presented by Simulation using MATLAB program codes translating the implementation of the proposed approach.
关键词： WCIP,scattering parameters,metamaterial,retrieval method,FSS,planar structure,effective parameters
更新于2025-09-12 10:27:22
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Four-bit instantaneous frequency measurement systems based on frequency selective surfaces
摘要： This paper presents four (FSSs) to be used in an instantaneous frequency measurement (IFM) systems. The FSS based on simple dipoles have a frequency response corresponding to the characteristics of frequency discriminators. An IFM system with 4-bits is shown with resolution around 300 MHz. The system contains 16 distinct frequency sub-bands between 3.21 and 8.75 GHz. CST software simulations and measurements of insertion loss are presented and compared with theoretical results to provide the binary codes of the system.
关键词： frequency discriminators,IFM,frequency selective surface (FSS)
更新于2025-09-10 09:29:36
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High efficient linear polariser using FSS structure
摘要： A linear polarisation converter surface with broadband and high-efficiency properties is proposed. The proposed frequency selective surface (FSS) polariser consists of two-corner-cut diagonal rectangular printed on a substrate backed by a pinwheel loop shape ground. The combination of two-corner-cut diagonal rectangular patch and pinwheel loop shape ground contributes to bandwidth expansion. Numerical results indicate that the FSS structure is capable of converting x or y polarised incident wave to the relevant cross-polarised wave in a wide frequency range from 7.5 to 24.5?GHz with a fractional bandwidth of 106% for ?10?dB rxy reflection amplitude. In addition, the ryy and rxy reflection coefficients of the proposed unit-cell present slight variation for different incident angles up to 40°, which verifies the applicability of the proposed FSS structure in a practical environment. For experimental validation, a prototype of the FSS structure is fabricated and reflection parameters of the proposed structure are measured which agree well with corresponding simulations. Due to the minimal dependency on the angle of incidence and non-uniform ground plane the proposed polarisation converter unit-cell can be a possible choice for secure building applications.
关键词： broadband,linear polarisation converter,frequency selective surface,FSS structure,high-efficiency
更新于2025-09-10 09:29:36