Ultrawide Bandwidth Electromagnetic Wave Absorbers Using a High-capacitive Folded Spiral Frequency Selective Surface in a Multilayer Structure

Li, Tian; Kim, Sung‐Soo

doi:10.1038/s41598-019-52967-z

Cited by 26 publications

(10 citation statements)

References 39 publications

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“…12,13 Many multilayer units have been proposed to achieve wideband absorption or radar cross-section (RCS) reduction. [14][15][16][17][18][19][20][21][22][23][24][25][26] An ordinary design idea is to combine multiple single-band (SB) absorbers operating in different frequencies using a multi-layer structure and ultimately achieve absorption in the broadband range. A pyramid absorber consisting of 10 layers of SB absorber structures is proposed, 14 which achieves a high absorption rate (>90%) in X-band and Ku-band with a fractional bandwidth of 71% and the total thickness is 0.26 λ L at the lowest operating frequency.…”

Section: Introductionmentioning

confidence: 99%

Design of an ultra‐broadband microwave metamaterial absorber based on multilayer structures

Yao

Huang

et al. 2022

Int J RF Mic Comp-Aid Eng

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An ultra-broadband double-layer microwave metamaterial absorber (MMA) with reflectivity below À10 dB ranging from 1.4 to17.31GHz is presented in this article. The MMA has a fractional bandwidth of 170% and a total thickness of 20.8 mm. By analyzing the function of different layers, the MMA can be simplified to the combination of a dual-band (DB) absorber and a single-band (SB) absorber. Layer I consists of a square loop loaded with asymmetric resistors and achieves a DB absorption by exciting high-order modes covering the low-frequency and high-frequency. Layer II is composed of double-ring structures integrated with resistors and realizes an SB absorber in the middle frequency. To understand the physical mechanism in detail, the equivalent circuit model (ECM) is proposed and illustrates a good impedance match within the entire absorption bandwidth with free space. An in-depth analysis has been carried out by illustrating several key dimensions. To verify our idea, a prototype has been designed, fabricated, and measured. Measurement results show an ultra-broadband absorption with the reflectivity below À10 dB ranging from 1.7 to 17.27 GHz under the normal direction, which agrees well with simulation and ECM results.

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Section: Introductionmentioning

confidence: 99%

Design of an ultra‐broadband microwave metamaterial absorber based on multilayer structures

Yao

Huang

et al. 2022

Int J RF Mic Comp-Aid Eng

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“…At present, the screen-printing technique is favourable for FSS fabrication. Screenprinting for flexible FSS [30,41,42], security paper FSS [43,44], absorber-based FSS [45], and millimetre-wave radar absorbing materials based FSS [46] are among the explored applications concerning the use of screen-printing technique for FSS fabrication. Apart from being cost effective, this technique is a relatively simple fabrication procedure, especially for large periodic array that is suitable for mass production in industry [30].…”

Section: Introductionmentioning

confidence: 99%

Optically Transparent Tri-Wideband Mosaic Frequency Selective Surface with Low Cross-Polarisation

et al. 2022

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Acquiring an optically transparent feature on the wideband frequency selective surface (FSS), particularly for smart city applications (building window and transportation services) and vehicle windows, is a challenging task. Hence, this study assessed the performance of optically transparent mosaic frequency selective surfaces (MFSS) with a conductive metallic element unit cell that integrated Koch fractal and double hexagonal loop fabricated on a polycarbonate substrate. The opaque and transparent features of the MFSS were studied. While the study on opaque MFSS revealed the advantage of having wideband responses, the study on transparent MFSS was performed to determine the optical transparency application with wideband feature. To comprehend the MFSS design, the evolutionary influence of the unit cell on the performance of MFSS was investigated and discussed thoroughly in this paper. Both the opaque and transparent MFSS yielded wideband bandstop and bandpass responses with low cross-polarisation (−37 dB), whereas the angular stability was limited to only 25°. The transparent MFSS displayed high-level transparency exceeding 70%. Both the simulated and measured performance comparison exhibited good correlation for both opaque and transparent MFSS. The proposed transparent MFSS with wideband frequency response and low cross-polarisation features signified a promising filtering potential in multiple applications.

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“…High values of FOM are accomplished using these types of structures, but at the cost of a significant reduction in their bandwidth. In the literature this type of structures are often used for propagation control, like electromagnetic shielding [16], electromagnetic absorbers [17], and bistate frequency selective surfaces [18].…”

Section: Introductionmentioning

confidence: 99%

Interwoven Hexagonal Frequency Selective Surface: An Application for WiFi Propagation Control

Vásquez-Peralvo

Fernández-González

Rigelsford³

et al. 2021

IEEE Access

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A sub-wavelength band stop unit cell Frequency Selective Surface, comprising six continuously interwoven hexagonal unit cells and arranged as a tessellated surface, is proposed, analyzed, simulated, and measured. The broadband and sub-wavelength characteristics of this unit cell, below the typical λ 0 /2, are analyzed and discussed. It has been demonstrated that by using the unit cell proposed in this paper, a 22% increase in the fractional bandwidth can be achieved along with a substantial improvement in its angular stability at high angles of incidence, compared to similar works previously published. The analysis of this unit cell is performed using the equivalent circuit method that allows relating the number of interweaves with the equivalent capacitance and inductance, thus giving a better understanding of the unit cell characterization. In addition, a frequency selective surface arranged in a 2.5D configuration is also proposed. This 2.5D configuration provides a bandwidth similar to the conventional model but with a reduction in the resonance frequency by 44%. Simulations have been validated using two prototypes, each having an overall dimension of 400 x 400 mm. To demonstrate the scalability of the design, both prototypes are designed to be used as WiFi propagation control, working as a band stop filter at 2.4 and 5.8 GHz, respectively. Transmission coefficients have been measured for TE and TM-modes using an optical bench at angles of incidence from 0 to 60 • . These compare favorably with simulations performed using the frequency domain solver in CST Microwave Studio and are found to have a maximum MSE of 2.3 ×10 −3 .

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Ultrawide Bandwidth Electromagnetic Wave Absorbers Using a High-capacitive Folded Spiral Frequency Selective Surface in a Multilayer Structure

Cited by 26 publications

References 39 publications

Design of an ultra‐broadband microwave metamaterial absorber based on multilayer structures

Design of an ultra‐broadband microwave metamaterial absorber based on multilayer structures

Optically Transparent Tri-Wideband Mosaic Frequency Selective Surface with Low Cross-Polarisation

Interwoven Hexagonal Frequency Selective Surface: An Application for WiFi Propagation Control

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