&lt;italic&gt;X&lt;/italic&gt;-Band Circuit-Analog Absorbers Using Unidirectional Carbon Fiber

Riley, Elliot J.; Lenzing, Erik H.; Narayanan, Ram M.

doi:10.1109/lawp.2018.2831909

Cited by 8 publications

(3 citation statements)

References 10 publications

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“…Measured values of σ ranged from 10000 to 60000 S in [23]. A value of σ = 10000 S performed the best in full-wave model simulations [24]. The material in the orthogonal direction is given the initial measured permittivity data of that sample at 90 • .…”

Section: Electromagnetic Simulationsmentioning

confidence: 99%

Salt Water Exposure Effects on Single-Layer, Unidirectional Carbon-Fiber Reinforced Polymer Circuit Analog Absorbers

O'Donnell¹,

Narayanan²

2021

PIER B

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This paper explores the effects of extended exposure to salt water fog on the microwave absorption properties of unidirectional carbon-fiber reinforced polymer (CFRP) circuit analog absorbers (CAA). Single-layer CFRP CAAs were fabricated using a wet-layup technique and were then subjected to a controlled salt water fog chamber following B117 standards. A total of ten samples using 305 g/m 2 areal-weight unidirectional CFRP were fabricated. Three samples were withdrawn from the salt water environment at ten-day intervals and tested, with the final samples being withdrawn after 30 days. The mass of each sample was measured immediately after removal to measure mass-accumulation and after a five-day interval to measure mass-loss. A free space microwave reflection measurement system was implemented to track and quantify changes to the absorption capabilities of the CAA. A physicallybased electromagnetic model was developed to characterize the changes caused by salt water absorption, and good agreement was observed with measured data.

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Section: Electromagnetic Simulationsmentioning

confidence: 99%

Salt Water Exposure Effects on Single-Layer, Unidirectional Carbon-Fiber Reinforced Polymer Circuit Analog Absorbers

O'Donnell¹,

Narayanan²

2021

PIER B

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“…The bandwidth of absorption can be improved if resistive FSS is employed instead of homogenous resistive sheets. This kind of absorber is called circuit analogue absorber (CAA) . The design procedure of them is summarized in tree steps …”

Section: Introductionmentioning

confidence: 99%

Novel synthesis formulas to design square patch frequency selective surface absorber based on equivalent circuit model

Firouzfar

Afsahi

Orouji

2019

Int J RF Microw Comput Aided Eng

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A new procedure is presented to design electromagnetic absorbers based on resistive square patch frequency selective surface (FSS) over grounded dielectric. The periodicity (p) and the distance between two adjacent squares in the lattice (w) are two unknowns to be solved, given the thickness and permittivity of the substrate, surface impedance of the square patches and the desired reflectivity in some specified frequency. Equivalent circuit model and transmission line method are employed here. Previously reported analysis formulas to calculate the square patch FSS admittance are exploited and novel synthesis formulas are extracted based of them. The final synthesis equations to calculate p and w are presented in term of polynomials. Usually an absorber is supposed to have a maximum reflectivity r in a frequency band [f 1 , f 2 ]. The (p, w) pairs for reflectivity less than r in f 1 , define an area in p-w plane. The intersection of the so-called area with the similar one defined by f 2 specifies all possible (p, w) pairs. Finally the results are tested and verified by the commercial full wave simulator Ansys-HFSS as well as some experimental design. There is a good agreement between the expected results with the full wave analysis and practical test. K E Y W O R D S synthesis formulas, equivalent circuit, square patch FSS absorbers

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“…The impedance matching of the co-planar antenna achieved a frequency band of 9.3-10.9 GHz (Jidi et al , 2018). A two layer circuit analog absorbing-based FSS structure was designed for X-band absorber application with the additional advantage of the reconfigurable frequency response with the help of a vacuum bagging system used (Riley et al , 2018).…”

Section: Introductionmentioning

confidence: 99%

Polarization independent bandstop frequency selective surface for X-band application

Kanchana

Sankararajan

Sreeja

et al. 2019

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Purpose A novel low profile frequency selective surface (FSS) with a band-stop response at 10 GHz is demonstrated. The purpose of this designed FSS structure is to reject the X-band (8-12 GHz) for the application of shielding. The proposed FSS structure having the unit cell dimension of 8 × 8 mm2, the miniaturization of the FSS unit cell in terms of λ0 is 0.266 λ0 × 0.266 λ0, where λ0 is free space wavelength. The designed FSS provides 4 GHz bandwidth with insertion loss of 15 dB. The transverse electric (TE) and transverse magnetic (TM) modes of the proposed design are same because of polarization independent characteristics and hold the angularly stable frequency response for both TE and TM mode polarization. Both the simulation and measurement results are in good agreement to each other. Design/methodology/approach The proposed FSS design contains square-shaped PEC material, which is placed on the substrate and the shape of the circle and rectangle is etched over the PEC material. The PEC material of the patch dimension is 0.0175 mm. The substrate used for the proposed design is FR4 lossy with the thickness of 0.8 mm and permittivity εr = 4.3 having a loss tangent of 0.02. Findings To find a new design and miniaturized FSS structure is discussed. Originality/value 100%

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<italic>X</italic>-Band Circuit-Analog Absorbers Using Unidirectional Carbon Fiber

Cited by 8 publications

References 10 publications

Salt Water Exposure Effects on Single-Layer, Unidirectional Carbon-Fiber Reinforced Polymer Circuit Analog Absorbers

Salt Water Exposure Effects on Single-Layer, Unidirectional Carbon-Fiber Reinforced Polymer Circuit Analog Absorbers

Novel synthesis formulas to design square patch frequency selective surface absorber based on equivalent circuit model

Polarization independent bandstop frequency selective surface for X-band application

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