Convoluted array elements and reduced size unit cells for frequency-selective surfaces

Parker, Edward A.; Sheikh, A.N.A. El

doi:10.1049/ip-h-2.1991.0004

Cited by 133 publications

(108 citation statements)

References 6 publications

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“…All dimensions are in millimeter. As that in [9], the ratio √ 2λ 1 /p is used as a figure of merit, where λ 1 is the first resonant wavelength. For all the three cases, λ 1 is approximately equal to 150 mm.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…By using fractal shapes, an arbitrarily long curve confined in a given volume can be obtained. This property has been shown effective in reducing the spacing between resonant elements in an FSS [9] and in reducing the volume occupied by small antennas [11]. And by exploiting the self-similarity property of fractals, multiband and wideband behaviors can be achieved in both FSS [6,14] and antenna [12,13] applications.…”

Section: Fractals and Their Applicationsmentioning

confidence: 99%

“…In the metamaterial applications, such as artificial magnetic conductor, miniaturized element is also required to facilitate flexible spatial filtering for an arbitrary wavefront. In [9], the fractal Hilbert curves are used to reduce the element size. In [10], the improved Gangbuster elements are used.…”

Section: Introductionmentioning

confidence: 99%

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Frequency Selective Surfaces With Fractal Four Legged Elements

Zhang¹,

Yin²,

Ma³

2009

PIER Letters

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Abstract-Frequency selective surfaces (FSSs) with fractal four legged aperture elements are studied. Three different order fractal elements are discussed for comparison. The results show that by using this novel kind of elements, multiband FSSs with miniaturized elements can be achieved. The ratio of the first resonant wavelength to the periodicity can be up to 10.36. Four passbands for normal incidence or two stable passbands for different incident angle and polarizations can be obtained. The FSS is analyzed by the spectral domain approach.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Fractals and Their Applicationsmentioning

confidence: 99%

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Frequency Selective Surfaces With Fractal Four Legged Elements

Zhang¹,

Yin²,

Ma³

2009

PIER Letters

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“…Various parameters of the proposed unit cell geometry are detailed in Table 1. The proposed unit cell is embraced from the simple dipole owing to its simplicity and is convoluted to increase the λ/p ratio which is the figure of merit for FSS amounts to 2.61 against the typical value of 1.5 for dipoles [10] ensures that there is less probability for the onset of grating lobes. The simple dipole can address only one type of polarization but this is overcome by the proposed CLD by its symmetrical nature.…”

Section: Proposed Fss Geometrymentioning

confidence: 99%

“…In addition, the proposed design with its circular apertures materializes the ventilation requirements. The structure is imbibed with the geometry similar in appearance to the dipole but convoluted in the center to achieve high value of λ/p ratio where p represents unit cell dimension [10], a figure of merit for FSSs.…”

Section: Introductionmentioning

confidence: 99%

A NOVEL SHIELD FOR GSM 1800 MHz BAND USING FREQUENCY SELECTIVE SURFACE

Sivasamy¹,

Kanagasabai²,

Baisakhiya³

et al. 2013

PIER Letters

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Abstract-This paper describes a novel FSS which functions as band stop filter to shield the GSM 1800 MHz downlink band. The FSS is designed to operate with the resonant frequency of 1820 MHz which is the centre frequency for the GSM 1800 MHz downlink band. The novelty is attributed to its unique geometry and the circular apertures endowed with it. The proposed geometry provides shielding effectiveness of 20 dB alongside with 133 MHz bandwidth. The structure holds identical response for both TE and TM Modes of polarization. In addition, the geometry with its circular apertures, a hitherto unexplored feasibility serves the purpose of ventilation and heat dissipation. The simulated results are validated using experimental measurements.

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Microwave subsurface imaging of dielectric structures using fractal geometries of complementary split ring resonators

Govind

Akhtar

2018

Int J RF Microw Comput Aided Eng

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In this paper, newly proposed complementary split ring resonator (CSRR) structures of fractal geometries are used for microwave imaging of coated dielectric structures in order to detect concealed voids or similar inclusions. The proposed fractal‐based CSRR structures are found to display improved sensitivity as compared to the conventional square CSRR sensors of same cross‐sectional dimensions, and thus appear to be more appropriate for imaging applications. Detailed analyses of different orders of square Sierpinski fractals have been carried out. Raster scanning of the test region is performed and various parameters such as the magnitude and phase at unloaded resonant frequency, along with the shift in resonant frequency when loaded with the test structure are measured. Furthermore, both qualitative and quantitative images of the test structure are retrieved in terms of all the three measured parameters. Simulation and experimental results demonstrate the applicability of the proposed sensor for microwave imaging.

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Convoluted array elements and reduced size unit cells for frequency-selective surfaces

Cited by 133 publications

References 6 publications

Frequency Selective Surfaces With Fractal Four Legged Elements

Frequency Selective Surfaces With Fractal Four Legged Elements

A NOVEL SHIELD FOR GSM 1800 MHz BAND USING FREQUENCY SELECTIVE SURFACE

Microwave subsurface imaging of dielectric structures using fractal geometries of complementary split ring resonators

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