Polarization-Insensitive and Angularly Stable Compact Ultrawide Stop-Band Frequency Selective Surface
TL;DR: In this paper, a compact ultrawide stopband frequency selective surface (FSS) with polarization-insensitive and higher level of angular stability property is presented, which consists of a very simple modified square-ring unit cell that exhibits excellent wideband rejection over the entire UWB 2.72-13 GHz range.
Abstract: In this letter, a compact ultrawide stop-band frequency selective surface (FSS) with polarization-insensitive and higher level of angular stability property is presented. It consists of a very simple modified square-ring unit cell that exhibits excellent wideband rejection over the entire ultrawideband (UWB) 2.72–13 GHz range. For TE incident wave, the λ0 × 0.066 λ0 × 0.013 λ0 ) compared to the earlier reported UWB FSSs is printed on a single-layer single-sided FR4 substrate. The design is flexible enough to tune the desired resonant frequency and the operating band by changing the length and width of the resonators. The design concept has been validated through proper measurement. This FSS can be used as a good reflector to enhance the gain of UWB antennas.
Citations
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TL;DR: In this article , a frequency selective surface for spatial filtering in the standardized ultra wide band (UWB) frequency range is proposed, with good polarization insensitivity and an angular stability of more than 60∘ and more than 50∘ in TE and TM incidence, respectively.
Abstract: A frequency selective surface for spatial filtering in the standardized Ultra-Wide Band (UWB) frequency range is proposed. A very large stop-band of 1.75–15.44 GHz has been obtained, with good polarization insensitivity and an angular stability of more than 60∘ and more than 50∘ in TE and TM incidence, respectively. Circuit models have been devised. The structure has been assessed by electromagnetic simulation and implemented on an FR4 substrate of 1.6 mm thickness, with an edge of the square-shaped unit cell of 15 mm. Tests in an anechoic chamber demonstrated good matching between simulation and experimental results and proper operation of the device.
14 citations
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TL;DR: In this paper, a bandstop frequency selective surface (FSS) prototype based on square split ring resonators (SSRRs) and a square loop (SL) structure for Ultra Wide Band (UWB) frequency range is presented.
Abstract: This article presents a bandstop Frequency Selective Surface (FSS) prototype based on square split ring resonators (SSRRs) and a square loop (SL) structure for Ultra Wide Band (UWB) frequency range. Triple band notches are obtained at WiMAX (3.3–3.6 GHz), WLAN (5–6 GHz), and Satellite communication X-band (7.2–8.4 GHz). To make this proposed design work as a band-stop filter, two SSRRs are positioned at the top layer of the substrate to resonate at WiMAX and WLAN frequency band, respectively. A single SL is located at the bottom of the substrate that resonates at satellite communication X-band. Attenuation more than 20 dB is observed at all notched frequencies. An angular stability from 0◦ to 40◦ is obtained. Compact size, simple structure, low cost material, single layer, easy fabrication, and wide coverage are some of the feathers of this proposed FSS. The dimension of proposed unit cell of FSS is 10 × 10 mm2.
6 citations
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TL;DR: In this article, a coplanar-waveguide (CPW)-fed ultra-wideband (UWB) monopole antenna with improved gain characteristic is proposed, which is designed on an FR-4 substrate with a compact size of 25 × 25 mm2.
Abstract: In this paper, we propose a coplanar-waveguide (CPW)-fed ultra-wideband (UWB) monopole antenna with improved gain characteristic. The antenna configuration consists of a circular monopole radiator with a rectangular strip. It is designed on an FR-4 substrate with a compact size of 25 × 25 mm2. By employing a new single-layer frequency selective surface (FSS), formed by 10 × 10 unit-cells, the gain characteristic of the antenna is enhanced from 1 ~ 3 dBi to 6.5 ~ 9 dBi. The FSS layer reflector is placed below the UWB monopole antenna. The unit cell of the proposed FSS consists of a square-ring patch with a protruded diamond-ring strip in it. The design concept has been discussed with simulations and good results are achieved.
5 citations
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TL;DR: In this article , a method of partition layout loading of frequency selective surface (FSS) absorbers to control the surface current is put forward, and remarkable radar cross section reduction of curved surfaces in the low microwave frequency band is reported.
Abstract: In this article, the significant radar cross section (RCS) reduction of curved surfaces in the low microwave frequency band is reported. The design method of partition layout loading of frequency selective surface (FSS) absorbers to control the surface current is put forward. Comparison of the scattering field intensities of different zones on the curved surface clearly shows that surface current should be suppressed in a large zone to effectively reduce the RCS of the curved surface at these frequencies. FSS absorbers under normal and 45° angle of incidence are designed and placed on the different zones of the curved surface to realize the partition layout loading, and remarkable RCS reduction has been obtained. Specifically, more than 15-dB RCS reduction is achieved in 1.05–1.45 GHz, and absorption above 90% is obtained from 0.95 to 1.5 GHz for TE polarization. The great agreement between the simulated and measured results validates the proposed design method.
4 citations
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TL;DR: An ultrathin and flexible frequency selective surface (FSS) for ultra-wideband electromagnetic interference (EMI) shielding has been proposed in this paper , where the capacitive coupled Greek cross-shaped fractal structure is printed on a single and flexible layer dielectric substrate having an extremely thin thickness of 0.0013λ0, where λ0 refers to the free space wavelength of the lower cutoff frequency.
Abstract: An ultrathin and flexible Frequency Selective Surface (FSS) for ultra-wideband electromagnetic interference (EMI) shielding has been proposed in this article. The novelty of the suggested design lies in its capacitive coupled Greek cross-shaped fractal structure that is printed on a single and flexible layer dielectric substrate having an extremely thin thickness of 0.0013λ0, where λ0 refers to the free space wavelength of the lower cutoff frequency. The introduction of capacitive coupling approach between the modified Greek cross fractal metallic structure and four symmetrical triangularly slotted conventional right-angled triangular metallic geometry results in an excellent ultra-wide stopband (UWSB) of more than 154% (2.07–15.76 GHz) and 105% (4.38–14.05) for < −10 dB and < −20 dB fractional bandwidth, respectively. The conformal configuration of the proposed geometry also exhibits a significantly better bandwidth more than 148.89% (−10 dB) and 109.5% (−20 dB) for UWSB. To accomplish the physical interpretation of the proposed FSS, the equivalent circuit model optimization has been illustrated also. Furthermore, the proposed structure demonstrates strong polarization independence and angular stability under both TE and TM polarization. Finally, the ultra-wideband shielding characteristics of both the planer and conformal designs have been confirmed experimentally in a free space measuring system.
3 citations
References
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26 Apr 2000
TL;DR: In this article, the authors present a comparison of band-pass and Dichroic filter designs for one and two-dimensional periodic structures, and present an overview of the current state-of-the-art.
Abstract: General Overview. Element Types: A Comparison. Evaluating Periodic Structures: An Overview. Spectral Expansion of One- and Two-Dimensional Periodic Structures. Dipole Arrays in a Stratified Medium. Slot Arrays in a Stratified Medium. Band-Pass Filter Designs: The Hybrid Radome. Band-Stop and Dichroic Filter Designs. Jaumann and Circuit Analog Absorbers. Power Handling of Periodic Surfaces. Concluding Remarks and Future Trends. Appendices. References. Index.
3,631 citations
"Polarization-Insensitive and Angula..." refers background in this paper
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TL;DR: In this article, an efficient approach to achieve the shielding effectiveness (SE) by using a frequency-selective surface (FSS) is presented, which consists of cross dipoles and rings printed on the opposite sides of a single-layer FR-4 substrate, exhibits a wide, 7.5GHz stopband to provide simultaneous shielding in both X and Ka-bands.
Abstract: An efficient approach to achieve the shielding effectiveness (SE) by using a frequency-selective surface (FSS) is presented. This FSS, which consists of cross dipoles and rings printed on the opposite sides of a single-layer FR-4 substrate, exhibits a wide, 7.5-GHz stopband to provide simultaneous shielding in both X- and Ka-bands. Experimental results confirm SE of the prototype over an ultra-wide band with more than 20-dB measured attenuation. The design is compact and suitable to provide shielding against the radiation interference caused by license-free and other radio systems.
144 citations
"Polarization-Insensitive and Angula..." refers methods in this paper
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TL;DR: In this article, the authors demonstrate the gain enhancement of an ultrawideband (UWB) antenna, achieved using an appropriately designed multioctave dual-layer frequency selective surface (FSS) reflector.
Abstract: In this letter, we demonstrate the gain enhancement of an ultrawideband (UWB) antenna, achieved using an appropriately designed multioctave dual-layer frequency selective surface (FSS) reflector. The proposed novel FSS reflects effectively in phase over a bandwidth of about 120%. Hence, significant enhancement in antenna gain has been achieved with a low-profile configuration without compromising the impedance bandwidth of the UWB antenna. The proposed FSS reflector has a low transmission coefficient and linearly decreasing phase over an ultra-wide frequency band, which is the key requirement for providing an effectively in-phase reflection at the antenna plane. The composite structure is compact, with a total height of λ/4, where λ is the free-space wavelength at the lowest operating frequency of 3 GHz. Experimental results show an impedance bandwidth of 122%. The antenna gain is maintained around 7.5 dBi from 3 to 7 GHz. Between 7-14 GHz, the antenna is more directive with a gain of about 9 dBi with ±0.5 dB variation. Experimental measurements con firm the predicted wideband antenna performance and gain enhancement due to the FSS reflector.
118 citations
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TL;DR: In this article, a parametric study of square loop and square slot frequency selective surfaces (FSSs) aimed at their equivalent circuit (EC) model optimization is presented, and the performance of the proposed EC model is assessed against results obtained from appropriate electromagnetic (EM) simulations, based on a root-mean-square error (RMSE) criteria.
Abstract: This paper presents a parametric study of square loop and square slot frequency selective surfaces (FSSs) aimed at their equivalent circuit (EC) model optimization. Consideration was given to their physical attributes, i.e., the unit cell dimensions and spacing, substrate thickness and dielectric properties, for several frequencies and plane wave incident angles. Correlation analysis and evaluation of the influence of physical related input parameters on the FSS performance are presented. Subsequent optimization factor for the square loop classical EC model is analyzed, and a novel EC model formulation for the square slot FSS is proposed. The performance of the proposed EC model was assessed against results obtained from appropriate electromagnetic (EM) simulations, based on a root-mean-square error (RMSE) criteria. Results demonstrate the validity of the optimized EC model, in which good estimations of the frequency response of FSS structures were obtained. Significant reduction of the resonant frequency offsets, in the order of 650 (from 910 to 260) and 460 (770 to 310) MHz, was obtained for square loops and square slots, respectively. The models were further validated against measurements performed on two physical FSS prototypes inside an anechoic chamber at 2.4 GHz. Relatively good agreement was obtained between measurements of real FSS prototypes and results obtained with the EC model. Finally, this work is sought to provide the necessary refinement of elementary models for further studies with more complex and novel FSS structures.
96 citations
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TL;DR: The proposed process has been extended to the analysis of bandpass structure and desired results have been achieved, which indicates the utility of the method of synthesis of both the bandpass and bandstop structures.
Abstract: In this manuscript, a simple synthesis method of single square loop frequency selective surface (SSLFSS) is discussed, which may flnd the suitable application in the fast analysis and fabrication of the frequency-selective surface. The presented technique is used to design SSLFSS at 3GHz, 15GHz, 22GHz and 26GHz. At every frequency of interest, the analytical result is very close to the required result. Moreover, a way to control the re∞ection at any frequency is discussed, which may flnd an application in controlling the re∞ection level at any frequency. However, we have proposed two simple, cheaper and lightweight structures at 3GHz and 22GHz for the application in various satellite communications. The proposed process has been extended to the analysis of bandpass structure and desired results have been achieved, which indicates the utility of the method of synthesis of both the bandpass and bandstop structures.
53 citations
"Polarization-Insensitive and Angula..." refers methods in this paper
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