A Wideband Transmission Frequency Selective Surface Rasorber

Wei, Jianfeng; Guo, Sai; He, Yun; Chen, Qian; Zhao, Ning; Bie, Shaowei; Jiang, Jianjun

doi:10.1109/piers-fall48861.2019.9021416

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…The absorption band of this layered structure is kept wide and, thus, the frequency selection feature is increased. In Wei et al (2019), where cross unit elements were used to design an FSS, the transmission band is achieved between 5.7 and 6.7 GHz, while in Lv et al (2021), the metasurface and absorber were superimposed for a good transmission band between 6.92 and 13GHz.…”

Section: Resultsmentioning

confidence: 99%

Mechanical and radar absorption properties of sheep wool/epoxy composites

Saracoglu,

Kiriş,

Çoban

et al. 2024

AEAT

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Purpose The aim of this study is to determine the fracture behavior of wool felt and fabric based epoxy composites and their responses to electromagnetic waves. Design/methodology/approach Notched and unnotched tensile tests of composites made of wool only and hybridized with a glass fiber layer were carried out, and fracture behavior and toughness at macro scale were determined. They were exposed to electromagnetic waves between 8 and 18 GHz frequencies using two horn antennas. Findings The keratin and lignin layer on the surface of the wool felt caused lower values to be obtained compared to the mechanical values given by pure epoxy. However, the use of wool felt in the symmetry layer of the laminated composite material provided higher mechanical values than the composite with glass fiber in the symmetry layer due to the mechanical interlocking it created. The use of wool in fabric form resulted in an increase in the modulus of elasticity, but no change in fracture toughness was observed. As a result of the electromagnetic analysis, it was also seen in the electromagnetic analysis that the transmittance of the materials was high, and the reflectance was low throughout the applied frequency range. Hence, it was concluded that all of the manufactured materials could be used as radome material over a wide band. Practical implications Sheep wool is an easy-to-supply and low-cost material. In this paper, it is presented that sheep wool can be evaluated as a biocomposite material and used for radome applications. Originality/value The combined evaluation of felt and fabric forms of a natural and inexpensive reinforcing element such as sheep wool and the combined evaluation of fracture mechanics and electromagnetic absorption properties will contribute to the evaluation of biocomposites in aviation.

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Section: Resultsmentioning

confidence: 99%

Mechanical and radar absorption properties of sheep wool/epoxy composites

Saracoglu,

Kiriş,

Çoban

et al. 2024

AEAT

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“…A square ring consisting of 12 identical interdigital resonators in series is chosen to be the lossy layer, 10 realizing a wide low insertion loss passband. An FSR with four lumped resonators in series to provide a wideband transmission is presented in [11]. Another way is to use resonators with a large factor Q , which is the ratio of the equivalent inductance of the resonator to the equivalent capacitance.…”

Section: Introductionmentioning

confidence: 99%

Wide transmission band rasorber of center‐connected pattern with multi‐resonators

Wei

et al. 2022

Micro & Optical Tech Letters

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A wide-transmission band rasorber is proposed in this letter. The structure consists of an lossy layer and a lossless layer. Since we find that the centerconnected pattern can achieve a wider bandwidth than the loop pattern, the lossy layer abandons the traditional loop pattern but uses a center-connected pattern to cascade multiple resonators. In addition, we proposed a new co-use resonator to further broaden the bandwidth. The simulated results show that the proposed rasorber has a transmission band (S21 〉 −1 dB) from 6.3 to 8.57 GHz, and the absorption band (S11 〈 −10 dB) is from 1.9 to 5 GHz. A prototype was fabricated and measured to validate our design. The simulated and measured results show good agreement, which prove the effectiveness of our design method. Compared with the previous FSRs, the proposed FSR yields a wider relative bandwidth with fewer resonators and can be fabricated more easily.

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“…According to the location of the transmission band, the FSRs can be divided into the following categories: transmission-absorption (T-A) FSRs, 1,2 transmission window in-band and absorption out-of-band (A-T-A), [3][4][5][6][7] and the transmission zero is at upper-frequency band besides absorption at lower frequency band FSRs (A-T). [8][9][10] One limitation of the techniques proposed in Reference 8 is that the structures are polarization-sensitive, thus they are suitable for being placed upon antennas with single polarization only. To tackle this problem, dualpolarization structures are studied.…”

Section: Introductionmentioning

confidence: 99%

Band‐notched frequency‐selective absorber with linear polarization rotation function

Jin

Kong

Wang

et al. 2022

Int J RF Mic Comp-Aid Eng

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This article presents a novel band‐notched frequency‐selective absorber (BFSA) with linear polarization rotation function in‐band and absorption out‐of‐band. When used as an antenna reflector, the BFSA can not only reduce RCS outside of the antenna's working band, but also reduce co‐polarized RCS within the working band and improve cross‐polarized reflection. The BFSA realizes −0.41 dB linear polarization‐rotating reflection at 4.5 GHz. In the upper and lower bands, the BFSA realizes a broad absorption function from 2.2 GHz to 4.1 GHz and 5.03 GHz to 6.5 GHz. The fractional bandwidth of linear co‐polarization reflection is 98.8% with 10 dB reflection reduction. The experimental measurements are conducted to validate the polarization conversion of the band‐notched absorbers, and good agreement between theory and measurement results is observed.

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A Wideband Transmission Frequency Selective Surface Rasorber

Cited by 3 publications

References 15 publications

Mechanical and radar absorption properties of sheep wool/epoxy composites

Mechanical and radar absorption properties of sheep wool/epoxy composites

Wide transmission band rasorber of center‐connected pattern with multi‐resonators

Band‐notched frequency‐selective absorber with linear polarization rotation function

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