Absorbing Frequency-Selective-Surface for the mm-Wave Range

Sakran, F.; Neve-Oz, Yair; Ron, A.; Golosovsky, M.; Davidov, D.; Frenkel, A.

doi:10.1109/tap.2008.924701

Cited by 66 publications

(34 citation statements)

References 12 publications

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“…The EM wave impedance of the perfect electric conductor is zero. Z(2) is the effective impedance at the interface of RAM coating and FSS, and Z(1) is the overall effective impedance of FSS and RAM [5,24,27].…”

Section: Implementation Of Fss On Rammentioning

confidence: 99%

“…Frequency Selective Surfaces (FSS) are planar periodic structures of identical patches or apertures of conducting elements repeating periodically in either a one or two-dimensional array on a dielectric substrate [1][2][3][4][5]. Because of their frequency selective properties, FSS are incorporated in a wide variety of applications such as the realization of reflector antennas, radome design, making polarizers and beam splitters, and also as radar absorbing structure [3,[6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Frequency Selective Surfaces for Radar Absorbing Materials

Singh¹,

Kumar²,

Meena³

et al. 2012

PIER B

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Abstract-Nowadays, applications of Frequency Selective Surfaces (FSS) for radar absorbing materials (RAM) are increasing, but it is still a challenge to select a proper FSS for a particular material as well as the dimensions of FSS for optimized absorption. Therefore, in this paper an attempt has been made to optimize the dimensions of FSS for microwave absorbing application using Genetic Algorithm (GA) approach. The considered frequency selective surfaces are composed of conducting patch elements pasted on the ferrite layer. FSS are used for filtration and microwave absorption. In this work, selection and optimization of FSS with radar absorbing material has been done for obtaining the maximum absorption at 8-12 GHz frequency. An equivalent circuit method has been used for the analysis of different FSS, which is further used to design fitness function of GA for optimizing the dimensions of FSS. Eight different available ferrite materials with frequency dependant permittivities and permeabilities have been used as material database. The GA optimization is proposed to select the proper material out of eight available materials with proper dimensions of FSS. The optimized results suggest the material from database and dimensions of FSS. The selected material is then mixed with epoxy and hardener, and coated over the aluminium sheet. Thereafter, all five FSS were fabricated on ferrite coated Al sheets using photolithographic method followed by wet etching. The absorption was measured for all FSS using absorption testing device (ATD) method at X-band. Absorption results showed that significant amount of absorption enhanced with the addition of proper FSS on radar absorbing coating.

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Section: Implementation Of Fss On Rammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Frequency Selective Surfaces for Radar Absorbing Materials

Singh¹,

Kumar²,

Meena³

et al. 2012

PIER B

View full text Add to dashboard Cite

show abstract

“…FSS are planar periodic structures of identical patches or apertures of conducting elements, and are generally employed in front of a grounded dielectric slab (substrate) to synthesize high-impedance absorbing surfaces [8,9]. The behavior of an FSS can be modeled by an equivalent effective resistor-inductor-capacitor (RLC) circuit [10,11].…”

Section: Introductionmentioning

confidence: 99%

Improvement of Microwave Absorbance of Polymer Composites of W-Type Hexaferrite Powders by Attachment of Frequency Selective Surface

Cho

Kim

2017

Archives of Metallurgy and Materials

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This work investigates the effect of a frequency selective surface (FSS) composed of a regular array of square loop elements on the absorption properties of grounded ferrite composites. Polymer matrix composites of CoZnW hexaferrite powders having small magnetic loss were used as the substrate material. Computational tools were used to model the interaction between electromagnetic waves and materials and determine the reflection coefficient. Reflection loss and bandwidth were greatly improved by attaching an FSS with controlled electrical resistance (R) onto the grounded ferrite composites. For the FSS with R = 800 Ω, the minimum reflection loss decreased to -25 dB at 10 GHz and the bandwidth was broadened to 7.5-12.5 GHz with respect to -10 dB reflection loss.

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“…To increase the absorption bandwidth, researchers have proposed several methods such as use of a multilayer structure, 9 magnetic medium, 10,11 resistive film, [12][13][14] and loading with lumped elements. 15,16 To date, all these methods are still not particularly easy to implement.…”

Section: Introductionmentioning

confidence: 99%

Polarization-Independent, Thin, Broadband Metamaterial Absorber Using Double-Circle Rings Loaded with Lumped Resistances

Chen

Huang

Zerihun

et al. 2015

Journal of Elec Materi

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We present a broadband and polarization-insensitive metamaterial absorber (MA) composed of a dielectric substrate sandwiched with double-circle rings (DCRs) and welded with lumped resistances and continuous metal film. The structure is designed with thickness of 3 mm and investigated by simulation, fabrication, and experiment. The results show that the composite MA loaded with lumped resistances has wider absorptivity compared with a structure with only DCRs. The simulation results indicate that the proposed absorber achieves 7.60-GHz-wide absorption from 8.87 GHz to 16.47 GHz with absorptivity greater than 90%, in excellent agreement with experimental results. Further simulations indicate that there exist optimal values for the lumped resistances for which the absorptivity is the highest and the bandwidth widest. Additionally, the proposed MA is polarization insensitive at normal incidence. Simulation results for wide angles of incidence of both transverse electric and transverse magnetic waves are also investigated.

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Absorbing Frequency-Selective-Surface for the mm-Wave Range

Cited by 66 publications

References 12 publications

Analysis of Frequency Selective Surfaces for Radar Absorbing Materials

Analysis of Frequency Selective Surfaces for Radar Absorbing Materials

Improvement of Microwave Absorbance of Polymer Composites of W-Type Hexaferrite Powders by Attachment of Frequency Selective Surface

Polarization-Independent, Thin, Broadband Metamaterial Absorber Using Double-Circle Rings Loaded with Lumped Resistances

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