Nonmagnetic Ultrawideband Absorber With Optimal Thickness

Kazemzadeh, Alireza

doi:10.1109/tap.2010.2090481

Cited by 104 publications

(59 citation statements)

References 18 publications

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“…Besides, even though Salisbury screen is easy to design, it is limited with one quarter wavelength thickness. 30,31 Very thin frequency selective surface (FSS) based absorbers and ultrathin metamaterial absorbers have been developed. 32,33 It should be mentioned that, in microwave bands, absorbers are mainly used for RCS reduction applications (rather than for sensor applications), in which high absorption, wide bandwidth and low profile are generally simultaneously required.…”

Section: -mentioning

confidence: 99%

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Graphene based tunable fractal Hilbert curve array broadband radar absorbing screen for radar cross section reduction

Huang

Liu

2014

AIP Advances

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This paper proposes a new type of graphene based tunable radar absorbing screen. The absorbing screen consists of Hilbert curve metal strip array and chemical vapour deposition (CVD) graphene sheet. The graphene based screen is not only tunable when the chemical potential of the graphene changes, but also has broadband effective absorption. The absorption bandwidth is from 8.9GHz to 18.1GHz, ie., relative bandwidth of more than 68%, at chemical potential of 0eV, which is significantly wider than that if the graphene sheet had not been employed. As the chemical potential varies from 0 to 0.4eV, the central frequency of the screen can be tuned from 13.5GHz to 19.0GHz. In the proposed structure, Hilbert curve metal strip array was designed to provide multiple narrow band resonances, whereas the graphene sheet directly underneath the metal strip array provides tunability and averagely required surface resistance so to significantly extend the screen operation bandwidth by providing broadband impedance matching and absorption. In addition, the thickness of the screen has been optimized to achieve nearly the minimum thickness limitation for a nonmagnetic absorber. The working principle of this absorbing screen is studied in details, and performance under various incident angles is presented. This work extends applications of graphene into tunable microwave radar cross section (RCS) reduction applications.

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Section: -mentioning

confidence: 99%

“…31,57 This theory is employed in our design to minimize the thickness of the graphene based absorbing screen.…”

Section: Bandwidth Optimizationmentioning

confidence: 99%

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Graphene based tunable fractal Hilbert curve array broadband radar absorbing screen for radar cross section reduction

Huang

Liu

2014

AIP Advances

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“…Osipov Artificial electromagnetic materials or metamaterials can be employed in the design of planar and electrically thin absorbers at microwave frequencies [4]. Metamaterial absorbers with operation frequencies ranging from a few GHz [5]- [8] up to the THz-regime [9]- [11] have been realized in recent years. In their most general form, they are analogous to frequency selective surfaces (FSS) [12] and are composed of a 2D periodic array of sub-wavelength sized inclusions printed on top of a grounded substrate.…”

Section: Introductionmentioning

confidence: 99%

Mono- and Bistatic Scattering Reduction by a Metamaterial Low Reflection Coating

Culhaoglu

Osipov

Russer

2013

IEEE Trans. Antennas Propagat.

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Significant reduction of mono-and bistatic scattering cross sections of an electrically large metallic cube through the application of an electrically thin metamaterial low reflection coating operating in the Ka-band (30 -40 GHz) is described. A coating composed of a metallic array of sub-wavelength sized capacitively loaded strip inclusions printed on top of a thin, slightly lossy and grounded substrate has been designed and fabricated to experimentally evaluate the performance of the coating in scattering reduction. The scattering reduction is estimated by comparing the mono-and bistatic scattering patterns of the coated and uncoated cube. The measurement results are compared with full wave and physical theory of diffraction simulations, and the possibility of accurately modeling the low reflection coatings with impedance boundary conditions is pointed out.

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“…Costa discussed the application of the lossy FSSs for the design of a broadband RA [9]. Kazemzadeh developed the capacitive circuit method for the design of a wideband absorber, whose total thickness could get the theoretical limit mentioned in [4], [10], and [11]. Their work focused on dielectric substrate other than magnetic substrate.…”

Section: Introductionmentioning

confidence: 99%

Design of a Lightweight Magnetic Radar Absorber Embedded With Resistive FSS

Liangkui Sun,

Haifeng Cheng,

Yongjiang Zhou

et al. 2012

Antennas Wirel. Propag. Lett.

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In this letter, the design of a lightweight magnetic radar absorber (RA) having broadband bandwidth in frequency range of 1-18 GHz is demonstrated. A 5-mm-thick magnetic RA with weak wave-absorbing performance is obtained on the basis of polyurethane foam filled with flake ferrous microwave absorbent. The use of frequency selective surfaces (FSSs) results in a significant increase of the absorbing intensity and operating bandwidth of the RA. By selecting the unit dimensions and modulating the location and square resistance of FSS, a maximal operating bandwidth with the reflectivity below 10 dB can be obtained. Experimental results are presented and compared to numerical simulations, and they demonstrated that the RA embedded with lossy FSS has a super broad bandwidth of 3.19-18 GHz with the reflectivity below 10 dB for the double-layer case. The density of the absorber is only 0.62 g/cm , which is far more less than that of the conventional magnetic coating radar absorbing materials (RAMs).Index Terms-Frequency selective surface (FSS), magnetic resonance, microwave absorber.

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Nonmagnetic Ultrawideband Absorber With Optimal Thickness

Cited by 104 publications

References 18 publications

Graphene based tunable fractal Hilbert curve array broadband radar absorbing screen for radar cross section reduction

Graphene based tunable fractal Hilbert curve array broadband radar absorbing screen for radar cross section reduction

Mono- and Bistatic Scattering Reduction by a Metamaterial Low Reflection Coating

Design of a Lightweight Magnetic Radar Absorber Embedded With Resistive FSS

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