A Technique for Designing Multilayer Multistopband Frequency Selective Surfaces

Xu, Gengyu; Hum, Sean V.; Eleftheriades, George V.

doi:10.1109/tap.2017.2772089

Cited by 48 publications

(38 citation statements)

References 17 publications

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“…The RFD value of the compared structures is obtained by examining the transmission coefficients at the maximum angle in which the angular stability was achieved. The detailed data of the proposed structure and the previous works 6,7,[12][13][14][15][16][17] are listed in Table 4. As the first five articles are examined, it is seen that the best average deviation value is 0.98% at 30 ∘ and 1.57% at 45 ∘ , respectively.…”

Section: Discussion and Comparisonmentioning

confidence: 99%

“…It is seen that the angular stability in multi-band FSS is given at angles ranging from 30 and 60 by following different approaches. 12,[14][15][16][17][18] In this article, a FSS consisting of F-type and square loop resonators with multi-band characteristics is presented. The F-type resonators (FTR) are placed on the upper and lower surfaces of the substrate in such a way that they are symmetrical with each other and the square loop structure surrounding FTRs is placed only on the upper surface.…”

Section: Introductionmentioning

confidence: 99%

“…FSS with different designs and structures proposed so far can be divided into three groups as single band, 3‐5 dual band, 6‐11 and multiband (triple and more) structures 12‐17 depending on the number of bands. Different design and techniques have been used to achieve multi‐band filtering, such as, a compact dual‐band, dual polarized band pass FSS is designed with combination of the band stops and high pass grid FSS for WLAN applications in Reference,11 the proposed structure consist of parallel LC resonators implemented by a via‐connected metallic line and a parallel‐plate capacitor in Reference,12 the FSS based on three‐ring geometry nested unsplit, single‐split and double‐split ring, respectively in Reference,13 a dogbone‐shaped patches by proposing an augmented ECM is used to design multilayer FSS in Reference,14 in the design of 15 square and circular loop patches are printed on a single‐sided lossy Teflon substrate which has very good heat and weather resistibility, the proposed FSS in Reference,16 comprises square loops arrays and supplemental apertures, respectively centered within a wire grid and an aperture grid, the FSS element based on four small square slots added in multiple stub resonators in Reference,17 and an angular‐stable multi‐layer reconfigurable FSS based on varactor is composed of three dielectric spacers and four metal layers in Reference 18…”

Section: Introductionmentioning

confidence: 99%

“…To prevent these systems from being influenced by their electromagnetic radiation, multi‐band FSS structures covering different operational frequency bands have been presented recently. Multi‐band band FSSs may show band‐pass filter behavior to provide frequency transmission, 9,12,17 or band‐stop filter response to provide shielding, 14 as well as multi‐functional characteristics using both 715,16 . Ensuring the stability of the angle of incidence at all resonance frequencies is one of the most important problems in multi‐band FSS.…”

Section: Introductionmentioning

confidence: 99%

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Design and analysis of angular stable antipodal F‐type frequency selective surface with multi‐band characteristics

Karahan

Aksoy

2020

Int J RF Microw Comput Aided Eng

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This article presents frequency selective surface (FSS) with multi-band characteristics that features tri band band-stop and dual-band passband filter. The proposed FSS unit cell comprises the F-type resonance elements disposed of antipodal (diametrically opposed to) one to another on both layer and a square loop surrounding all resonators on the top layer of the dielectric substrate. The structure is specifically designed to filter out some extensively used broadband communication signals, such as, WiMAX and WLAN while enabling C-band satellite communication in the earth station and provides three stopbands operating at 2.4, 5.2, and 5.9 GHz besides two passbands of 4.1 and 5.5 GHz. Although this structure has a multi-band structure, it exhibits high stable performance for oblique incidence ranging from 0 to 60 for both transverse electric (TE) and transverse magnetic (TM) polarizations. Considering the resonant frequency deviation (RFD) at the incidence waves with different angles of arrivals, it was found that RFD at 60 is less than 0.6% on average and very low when compared with existing studies about multi-band FSS. The detailed equivalent-circuit model (ECM) is employed to predict and analyze the transmission characteristic of the proposed structure, and a good agreement between the simulated and measured transmission coefficients is obtained.

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Section: Discussion and Comparisonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design and analysis of angular stable antipodal F‐type frequency selective surface with multi‐band characteristics

Karahan

Aksoy

2020

Int J RF Microw Comput Aided Eng

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“…Apart from multi-layered radome wall configurations composed of homogenous material layers, frequency selective surface (FSS) based radomes present another attractive option for the realization of multi-band functionality. Xu et al presented a computationally efficient technique for the design and optimization of multi-layered FSSs for realizing multiple stopbands [8,9]. Here, several layers with dog bone shaped patches optimized for specific stopband responses have been cascaded together to generate the multiband response.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design Methodology for Planar Multi-Layered Radomes for Multiband Applications Using Nature Inspired Algorithm

Joy¹,

Teena²,

Singh³

et al. 2020

PIER C

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An efficient nature inspired algorithm based on particle swarm optimization (PSO) is presented in this paper for the optimal design of planar multi-layered radomes for multiband applications. Material layer sequence and thickness profile are the two critical factors determining the position of passbands in the frequency range of operation as well as the transmission performance in those bands. These design aspects have to be appropriately optimized to achieve the desired performance, and it becomes a daunting task for radome designers when a comparatively large database of suitable materials is available in the solution space. Even though commercially available software packages provide options (like particle swarm optimization (PSO), genetic algorithm (GA), etc.) for the optimization of thickness profile, they do not have the functionality for optimizing the position of a specific material inside the multi-layered radome wall configuration. In this regard, the proposed PSObased algorithm automatically chooses suitable materials from the predefined database and optimizes the thickness for each layer, in order to achieve superior transmission in user defined passbands. Furthermore, the superiority of the indigenously developed algorithm over the optimization techniques available in full wave simulation software (FEKO) w.r.t. accuracy and computational efficiency is also established using suitable case studies and validations. Although PSO has been used in the context of radomes, its application for the simultaneous optimization of material layer sequence and thickness profile of multi-layered radomes is not reported in literature to the best of our knowledge.

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Performance evaluation of compact FSS‐integrated flexible monopole antenna for body area communication applications

Sugumaran

Balasubramanian

Palaniswamy

2022

Int J Communication

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Summary This article presents a compact wearable antenna integrated with a novel frequency selective surface (FSS) made of textile materials. The antenna can be applied in wearable health monitoring applications aimed at the 2.45‐GHz Industrial Scientific and Medical (ISM) band. An array of 4 × 4 octagonal slot‐shaped FSS (106 × 106 mm2) superstrate enhances the performance of the modified Koch curve planar monopole antenna (44.85 × 39 mm2). The Jeans substrate prototype with the overall dimensions of 1.128λ0 × 1.128λ0 × 0.319λ0 covers the bandwidth of 2.45‐GHz ISM band from 2.24 to 2.76 GHz (S11 ≤ −10 dB). The band rejection and reflective nature of the proposed FSS suppress the back radiation and improves the antenna's gain by −20 dB and 6.3 dBi, respectively. The specific absorption rate (SAR) level is reduced to 0.445 W/kg from 24.995 W/kg with a higher reduction rate of 98.21%. Many literature reports produced higher gain and lower SAR but exhibited reduced efficiency when the antenna is placed near the human body. The wearable antenna's frequency response tends to vary under bending conditions for narrowband antennas. Wide‐band monopole antennas produce omnidirectional radiation pattern which tends to affect human body tissues. So stable polarization‐insensitive FSS is placed behind the antenna to enhance the antenna's gain and avoid back radiation. The proposed antenna exhibits stable performance under bending conditions with fractional bandwidth of 22.2%, gain of 8.83 dBi, and produces a better efficiency of 91.30% when the antenna is positioned in the vicinity with human body models. The experimental validation shows that the proposed antenna is a promising candidate for wireless body area networks.

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A Technique for Designing Multilayer Multistopband Frequency Selective Surfaces

Cited by 48 publications

References 17 publications

Design and analysis of angular stable antipodal F‐type frequency selective surface with multi‐band characteristics

Design and analysis of angular stable antipodal F‐type frequency selective surface with multi‐band characteristics

Optimal Design Methodology for Planar Multi-Layered Radomes for Multiband Applications Using Nature Inspired Algorithm

Performance evaluation of compact FSS‐integrated flexible monopole antenna for body area communication applications

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