Investigations on fractal frequency selective diaphragms in rectangular waveguide

Ghosh, Basudeb; Sinha, Shishir; Kartikeyan, M. V.

doi:10.1002/mmce.20423

Cited by 9 publications

(3 citation statements)

References 16 publications

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“…The first FSS unit is a folded cross dipole, and the second one is composed of a large cross, four medium crosses, and 16 small crosses. Both FSS units can be regarded as the quasi‐fractal structures which provide a better compact and wideband performance for the FSS applications 20 . As it is shown in Luo et al 21 and Chatterjee and Parui, 22 the slotted FSS behaves as a bandpass spatial filter which allows in‐band signal to pass through and reflects the out‐of‐band signal.…”

Section: Design Of the Two Quasi‐amc Unitsmentioning

confidence: 99%

Broadband RCS reduction for both microstrip array and Fabry‐Perot antenna based on the quasi‐ AMC superstrate

Liu

Yan

2021

Int J RF Microw Comput Aided Eng

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This article presents a new type of quasi‐AMC superstrate (QAMCS), which can achieve wideband RCS reduction (RCSR) for both the microstrip array and Fabry‐Perot (FP) antenna. The proposed QAMCS comprises of two‐layer metallic patterns with a thin air gap. The top‐layer consists of two types of frequency selective surfaces (FSSs) in a checkerboard layout, and the wideband RCSR is realized based on the phase cancelation principle. The bottom‐layer consists of the slotted FSS, to reflect out‐of‐band signal while allowing the in‐band signal to pass through with a low insertion loss. Besides, the reflection phase of the proposed QAMCS is about −180° around higher frequencies. Therefore, it can be regarded as a partially reflecting surface (PRS) to construct the FP antenna with a highgain and low‐RCS. The simulation and measurement results show that the bandwidth of 10‐dB RCSR is more than 76% (7.2‐16.1 GHz). The 10‐dB impedance bandwidth of the array antenna is ranging from 16.6 to 18.6 GHz. For the FP antenna, its aperture efficiency is 31.5% and the peak gain is 17.5 dBi at 20 GHz.

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Section: Design Of the Two Quasi‐amc Unitsmentioning

confidence: 99%

Broadband RCS reduction for both microstrip array and Fabry‐Perot antenna based on the quasi‐ AMC superstrate

Liu

Yan

2021

Int J RF Microw Comput Aided Eng

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“…Hilbert curve fractal structures have widely been used in the design of antennas, electromagnetic bandgap structures and as a transverse discontinuity in the rectangular waveguides [6][7][8]. It has been found that the Hilbert curve also shows a similar characteristic of negative permittivity and can be effectively used as the filter elements in the SIW technology.…”

Section: Introductionmentioning

confidence: 98%

Bandpass characteristics of substrate integrated waveguide loaded with Hilbert curve fractal slot

et al. 2011

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This paper presents an investigation on the design of miniaturized substrate integrated waveguide unit cell loaded with Hilbert curve fractal slots. It has been found that the proposed structures exhibits a passband which is well below the cut off frequency of the substrate integrated waveguide and hence, can be used in the design of miniaturized filter. Different orientations of the Hilbert curve are investigated and an optimum orientation which gives the best passband response is found. A simple two stage filter based on that particular orientation of Hilbert slot is also presented in the paper.

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“…We will consider both perfectly periodic and aperiodic systems. The last one is the fractal-like (Cantor-like) multilayer [29][30][31][32][33][34]. It is known that the periodicity disturbance of a layered isotropic one-dimensional sample produces appearing additional high-Q resonances (localized modes) in the stopbands.…”

Section: Introductionmentioning

confidence: 99%

Mutual Conversion of Tm_mn and Te_mn Waves by Periodic and Aperiodic Waveguide Filters Composed of Dense Metal-Strip Gratings

Tuz¹,

Prosvirnin²,

Kazanskiy³

2011

PIER B

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Abstract-The mutual conversion of the TM mn and TE mn waves (m, n = 0) in periodic and aperiodic (fractal-like) stratified waveguide structures composed of dense metal-strip gratings is studied. The stopbands and passbands conditions of Bloch waves, the reflection and transmission spectra of the periodic structure are examined versus the gratings parameters. Peculiarities of the wave localization, selfsimilarity and scalability of both reflected and transmitted spectra of the fractal-like structure are investigated. The appearance of additional peak multiplets in stopbands is revealed and a correlation of their properties with the parameter of grating filling is established.

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Investigations on fractal frequency selective diaphragms in rectangular waveguide

Cited by 9 publications

References 16 publications

Broadband RCS reduction for both microstrip array and Fabry‐Perot antenna based on the quasi‐ AMC superstrate

Broadband RCS reduction for both microstrip array and Fabry‐Perot antenna based on the quasi‐ AMC superstrate

Bandpass characteristics of substrate integrated waveguide loaded with Hilbert curve fractal slot

Mutual Conversion of Tm_mn and Te_mn Waves by Periodic and Aperiodic Waveguide Filters Composed of Dense Metal-Strip Gratings

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