Novel synthesis formulas to design square patch frequency selective surface absorber based on equivalent circuit model

Firouzfar, Amir; Afsahi, Majid; Orouji, Ali A.

doi:10.1002/mmce.21680

Cited by 12 publications

(7 citation statements)

References 28 publications

(33 reference statements)

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“…Hence, instead of altogether proposing a new FSS patch design to demonstrate the design and fabrication process, a well-known, and thoroughly investigated square patch FSS is considered. Design and analysis of a square patch FSS for its application as EM absorber is systematically explained in [5], [12], [13]. Fig.…”

Section: Design and Analysis Of Absorbermentioning

confidence: 99%

An Ultrathin Graphite Based Absorber for Wearable Applications

Avinash

Gupta

2021

Preprint

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In this paper, a low-cost, flexible, ultrathin absorber comprising a simple square patch-shaped frequency selective surface (FSS) is proposed for wearable applications. The FSS based absorbing structure contains periodic graphite patch pattern placed on a thin paper substrate, and backed with a copper foil-based ground plane. The dimension and periodicity of the unit cell are 0.31λo and 0.36λo respectively, while the thickness of the absorber is approximately λo/85, where λo is the wavelength of free space at 10 GHz. The characteristics of the FSS absorber is optimized in terms of unit cell periodicity, and dielectric substrate height using a full-wave high frequency structure simulator software (HFSS). The effects of the parameters are also examined using equivalent circuit approach. The proposed absorber shows insensitivity towards the angle of incidence as well as angle of polarization. Finally, a prototype model is fabricated, measured, and validated with simulation results. A good agreement is depicted between simulated and experimental models. The proposed absorber finds application in the field of wearable electronics, medical, and automotive applications for effective mitigation of the EMI.

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Section: Design and Analysis Of Absorbermentioning

confidence: 99%

An Ultrathin Graphite Based Absorber for Wearable Applications

Avinash

Gupta

2021

Preprint

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“…In [5], a number of limbs and the different working modes of the single layer FSS unit cell is used to generate the two flexible adjustable transmission zeros, where the transmission pole is 4 GHz, and its bandwidth achieves 0.62 GHz. In [6], the values of periodicity and size of the array are obtained through calculations of the capacitive admittance and resistance of the FSS by a simple analytic method based on the transmission line theory. In [7], the analysis and the synthesis use the Genetic Algorithm (GA) with ECM, where the physical dimensions are obtained through the stop band, pass band and resonance frequency.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Multiband Frequency Selective Surfaces Using Machine Learning With the Decision Tree Algorithm

et al. 2021

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This paper presents the synthesis of multiband frequency selective surfaces (FSSs) using supervised machine learning (ML) with the decision tree (DT) algorithm. The proposed FSS structure is composed of an array of metallic patches printed on a dielectric substrate for stopband spatial filtering microwave applications. The shapes of the metallic patches are based on the sunflower (helianthus annus) geometry. In the first step, a parametric analysis is performed to investigate the use of different FSS geometries, including those with circular, annular and corolla integrated patch elements, to compose the sunflower geometry, regarding multiband and polarization independent performances with size reduction. Two bioinspired FSS geometries are synthesized using supervised machine learning with the decision tree algorithm. The random forest (RF) algorithm is used to validate the decision tree algorithm and to confirm the obtained results. The numerical analysis of the proposed FSS geometries is performed using Ansoft Designer software. Prototypes are fabricated and measured. The good agreement observed between simulated and measured results has validated the proposed approach. The use of supervised machine learning with the decision tree algorithm resulted in a particularly efficient and accurate synthesis procedure due to its intuitive implementation and simplified and effective data analysis modelling.

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“…In the past centuries, the research on the reflection and transmission characteristics of frequency selective surface (FSS) has attracted extensive attentions. [1][2][3][4][5] Numerous methods were developed for the analysis and optimization of FSS, such as the numerical algorithms [6][7][8][9][10][11][12][13] and the corresponding commercial software [1][2][3][4][5][14][15][16][17][18][19] and the approximate analytical methods. [20][21][22][23][24][25][26][27][28][29][30][31][32] Generally, the numerical algorithms are time consuming with fewer physical interpretation of the filter characteristic.…”

Section: Introductionmentioning

confidence: 99%

“…One would have to adopt the curve-fitting scheme or a similar approach based on full-wave simulation. [1][2][3][4][5][21][22][23][24][25] Recently, an interference theory was developed for polygon-based broadband absorbers. However, the reflection and absorption rates are also simulated by commercial software.…”

Section: Introductionmentioning

confidence: 99%

Approximate analytical method for hexagonal slot frequency selective surface analysis

Luo

Meng

Zhu

et al. 2021

Int J RF Microw Comput Aided Eng

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In this article, an efficient approximate analytical method for hexagonal slot frequency selective surface (FSS) analysis is proposed. The main contribution of this article is to derive the tangential incident electric field along each oblique strip complementary to the hexagonal slot, so that Kirchhoff type circuit can be established according to the transmission line parameters and distributed sources. The current distribution is solved using Kirchhoff current law and continuity condition for potential. The transmission characteristic can then be calculated following Munk's scheme. Meanwhile, the physical nature of Munk's scheme is studied. The periodic circuit equations are derived from the corresponding electromagnetic field boundary conditions. The approximate closed-form expressions for aperture field and patch surface current distribution of common FSS elements can be calculated by the method of moments. From the analysis, it is known that the receiving current and transmitting current corresponds to the basis function and test function, respectively. Measured and simulated results of a symmetric hybrid radome composed of hexagonal slot are carried out to verify the accuracy and efficiency of the presented method. The CPU time is about 600 and 0.4 second for CST and the proposed method, respectively.

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Novel synthesis formulas to design square patch frequency selective surface absorber based on equivalent circuit model

Cited by 12 publications

References 28 publications

An Ultrathin Graphite Based Absorber for Wearable Applications

An Ultrathin Graphite Based Absorber for Wearable Applications

Synthesis of Multiband Frequency Selective Surfaces Using Machine Learning With the Decision Tree Algorithm

Approximate analytical method for hexagonal slot frequency selective surface analysis

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