Low-Loss Dual-Polarized Frequency-Selective Rasorber With Graphene-Based Planar Resistor

Wu, Bian; Yang, Yaojia; Li, Huiling; Zhao, Yutong; Fan, Chi; Lu, Wei‐Bing

doi:10.1109/tap.2020.2998173

Cited by 45 publications

(14 citation statements)

References 29 publications

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“…The focus spot size of this antenna is 30 mm × 30 mm. Therefore, we can accurately measure the reflection coefficients and transmission coefficients of the sample without measuring very large samples . The microwave reflections in the K (18–26.5 GHz) and Ka (26.5–40 GHz) bands were measured using a horn antenna system based on the arch method.…”

Section: Resultsmentioning

confidence: 99%

Optically Transparent Broadband Microwave Absorber by Graphene and Metallic Rings

Han

et al. 2022

ACS Appl. Mater. Interfaces

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The demand for optically transparent microwave absorbers has attracted increasing interest among researchers in recent years. However, integrating broadband microwave absorption and high optical transparency remains a challenge. This report demonstrates a scheme for broadband microwave absorbers, featuring a 90% absorption bandwidth of 10 GHz covering a frequency range of 25.2–35.2 GHz and high compatibility with good optical transparency in a wide band from the visible to infrared. The absorber is based on a Jaumann structure composed of two graphene sheets sandwiched by dielectric and backed by an arrayed-metallic-rings sheet. Guided by derived formulas, this absorber exhibits complete absorption if the sheet resistance of graphene is close to 500 Ω sq–1. The bandwidth and center frequency of the absorption spectra can be readily tuned simply via changes in the thickness of the dielectric between the graphene films and arrayed-metallic-rings sheet. Moreover, the absorber is insensitive to the incident angle of radiation and can achieve broadband and near-unity absorption even at oblique incidence. The graphene-based absorber proposed herein provides a viable solution for effectively integrating broadband and near-unity microwave absorption with high optical transparency, thereby enabling widespread applications in optics, communications, and solar cells.

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Section: Resultsmentioning

confidence: 99%

Optically Transparent Broadband Microwave Absorber by Graphene and Metallic Rings

Han

et al. 2022

ACS Appl. Mater. Interfaces

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“…The metallic FSS layer should have the same transmission bands with that of the lossy layer to ensure low insertion loss and high reflection bands corresponding with absorption bands of the lossy layer to strengthen the absorptivity and broaden the absorption bandwidth of FSRs. Based on the relative positions of passbands and absorption bands, 2-D FSRs in the past literatures can be sorted into four types, which are respectively: (1) low-frequency absorption and high-frequency transmission (AT) 14 , 16 , 17 ; (2) low-frequency transmission and high-frequency absorption (TA) 13 , 18 – 20 ; (3) low-frequency absorption, intermediate-frequency transmission and high-frequency absorption (ATA) 15 , 21 – 25 ; (4) low-frequency transmission, intermediate-frequency absorption and high-frequency transmission (TAT) 26 – 31 .…”

Section: Introductionmentioning

confidence: 99%

“…In fact, the absorption performance, transmission characteristics and oblique incidence stability must be considered together, if FSRs were widely applied in communications and radar systems with multiple operating frequency bands. Absorption bands of existing FSRs are usually measured by − 10 dB reflection 17 , 24 , 26 , 30 , which cannot precisely represent 90% absorption the same as absorber. For example, although a single layer resistive FSS can also produce a wide − 10 dB reflection band and low insertion loss transmission bands, this − 10 dB reflection band will not be regarded as an effective absorption band.…”

Section: Introductionmentioning

confidence: 99%

A dual-transmission-bands rasorber with improved absorption and oblique incidence performance

Jiang

et al. 2022

Sci Rep

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In this paper, a high-absorption and dual-transmission-bands rasorber (HADTR) was proposed. Different from the reported designs, a foam layer and a FR4 layer are added as top layers in HADTR to improve its absorption and oblique incidence performance. The unit cell of resistive layer is concentric metallic rings loaded with chip resistors based on absorption enforced design to ensure its dual-transmission-bands at the same time. The unit cell of band-stop frequency selective surface (BS-FSS) is double metallic square loops loaded with chip inductors on both sides of FR4 substrate, which expands its reflection band (|S11|≥ − 1.0 dB) without destroying its dual-transmission-bands effectively. At normal incidence, for TE and TM polarization, the HADTR has a low-frequency passband up to 1.34 GHz (|S21|≥ − 1.5 dB), a high-frequency passband from 16.04 to 18.00 GHz (|S21|≥ − 1.5 dB) and a wide 90% absorption band from 5.01 to 10.56 GHz; and the reflection coefficient below − 10 dB and − 20 dB is in the range of 4.48–11.70 GHz and 5.48–9.96 GHz, respectively. For TE/TM polarization, the 90% absorption of oblique incidence stability is 40° and 30° respectively. Strong association between measurement and simulation results validates the design method and the HADTR.

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“…It has been widely used in radar‐stealth radome, 2 reflector antenna system, reducing antenna radar cross section (RCS) 3 . Regarding the design of FSS unit, the previous literatures mostly started directly from the structure, through the design of miniaturization, 4 multilayer FSS cascade, 5 loading with active LC devices, 6 loading graphene 7 or substrate integrated waveguide (SIW) 8 to improve the in‐band transmission and out‐of‐band suppression of FSS units. These methods open up new ideas for the research of FSS.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of dual‐band FSS based on equivalent circuit

Zhao

2022

Int J RF Mic Comp-Aid Eng

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A method of designing bandpass frequency select surface (FSS) has been proposed based on series and parallel equivalent circuit thought in this article.The novel dual-band equivalent circuits are designed. The equivalent admittances were extracted, and resonance frequency was calculated. The dual-band properties of circuit were verified, which lays foundation for the designing of FSS structure. The FSS unit designed in this paper adapts single-layer thin substrate, and it has simple structure, is easy to implement. The thickness of dualband is 0.017 wavelength. The angle stability and polarization stability of FSS are improved by utilizing miniaturization ideas and adding symmetrical structures. The dual-band FSS consists of two inner and outer loops nested. The inner ring is the Jerusalem structure, and the outer ring is folded structure, both can be independently adjustable resonance frequency. It can realize stable resonance at center frequencies under oblique incidence of 0 to 60 for both TE and TM polarization. For verifying filtering properties of FSS units, the prototypes are fabricated and measured. The results calculated by fullwave, equivalent circuit method (ECM) and measurement are in good agreement.

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Low-Loss Dual-Polarized Frequency-Selective Rasorber With Graphene-Based Planar Resistor

Cited by 45 publications

References 29 publications

Optically Transparent Broadband Microwave Absorber by Graphene and Metallic Rings

Optically Transparent Broadband Microwave Absorber by Graphene and Metallic Rings

A dual-transmission-bands rasorber with improved absorption and oblique incidence performance

Design and analysis of dual‐band FSS based on equivalent circuit

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