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Proceedings ArticleDOI

An Illustration of a novel All Dielectric 3D FSS based Band-Pass Filter

TL;DR: An all dielectric FSS based band-pass filter has been proposed which exhibits three transmission zeroes and high degree of angular stability and polarization insensitivity is registered by the 3D FSS unit cell.
Abstract: An all dielectric FSS based band-pass filter has been proposed which exhibits three transmission zeroes. AD410 and AD1000X have been integrated to conceive a composite structure which yields band-pass response in three consecutive bands namely 3.2-5.3 GHz, 6.7-9.1 GHz and 9.911.6 GHz respectively. High degree of angular stability (40°) and polarization insensitivity (60°) is registered by the 3D FSS unit cell. The band-pass characteristics have been investigated through parametric studies and simulations which are carried out in HFSS.
References
More filters
Journal ArticleDOI
TL;DR: In this paper, an approach to correcting electric near-field phase and magnitude over a wideband for Fabry-Perot resonator antennas (FPRAs) is presented, where a time-average Poynting vector in conjunction with a phase gradient analysis is utilized to suggest the initial configuration of the NFCS for wideband performance.
Abstract: A systematic approach to correcting electric near-field phase and magnitude over a wideband for Fabry–Perot resonator antennas (FPRAs) is presented. Unlike all other unit-cell-based near-field correction techniques for FPRAs, which merely focus on phase correction at a single frequency, this method delivers a compact near-field correcting structure (NFCS) with a wide operational bandwidth of 40%. In this novel approach, a time-average Poynting vector in conjunction with a phase gradient analysis is utilized to suggest the initial configuration of the NFCS for wideband performance. A simulation-driven optimization algorithm is then implemented to find the thickness of each correcting region, defined by the gradient analysis, to complete the NFCS design. According to the predicted and measured results, the phase and magnitude distributions of the electric near field have been greatly improved, resulting in a high aperture efficiency of 70%. The antenna under NFCS loading has a peak measured directivity of 21.6 dB, a 3 dB directivity bandwidth of 41% and a 10 dB return loss bandwidth of 46%, which covers the directivity bandwidth. The diameter of the proposed NFCS is $3.8\lambda _{0c}$ , which is around half that of all the other unit-cell-based phase-correcting structures, where $\lambda _{0c}$ is the free-space wavelength at the central frequency of the NFCS (13.09 GHz).

67 citations


"An Illustration of a novel All Diel..." refers methods in this paper

  • ...Near field phase correcting structure [10] for Fabry Perot Resonator Antenna has been designed using all-dielectric surface....

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Journal ArticleDOI
TL;DR: In this article, an all-dielectric frequency selective surface (ADFSS) was developed using genetic algorithms and fast Fourier transforms (FFTs) to generate random geometries.
Abstract: In this paper, an all-dielectric frequency selective surface (ADFSS) was developed using genetic algorithms and fast Fourier transforms (FFTs) to generate random geometries. This device showed a stop-band fractional bandwidth (FBW) of 54% and a field of view of 16°. The optimized FSS was manufactured by three-dimensional (3-D) printing and the frequency response was measured in the laboratory. This device was also tested in the pass band at a high pulsed microwave power of $\bf{45.26}\;\bf{MW}/\bf{m}^{\bf{2}}$ and no damage was observed. This is the first known demonstration of a 3-D printed ADFSS.

64 citations


"An Illustration of a novel All Diel..." refers methods in this paper

  • ...A 3D all dielectric FSS has been optimized by genetic algorithm in [7] showing a fractional bandwidth of 54%....

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Journal ArticleDOI
TL;DR: In this article, an electromagnetic-wave beam-scanning antenna system using a simple rotation of a pair of near-field graded-dielectric plates (GDPs) was proposed.
Abstract: The paper proposes an electromagnetic-wave beam-scanning antenna system using a simple rotation of a pair of near-field graded-dielectric plates (GDPs). The antenna system requires an electromagnetic (EM) illuminator, with nearly symmetric aperture field distribution, as the base antenna and two types of GDPs: one radially graded dielectric (RGD) and two linearly graded dielectric (LGD) plates. The RGD first focuses the beam of the base antenna in the broadside direction, and the LGD then tilts the focused beam at an offset angle. For some types of base antennas, having fairly uniform aperture phase distributions, an RGD may not be required and only a pair of LGDs are sufficient. Irrespective of the antenna configuration, using a simple rotation of the two LGDs, the beam can be scanned to any position within a large conical region. The antenna system presented as a proof of concept has a resonant-cavity antenna as the base antenna and three graded-dielectric plates. The aperture length of the antenna system is 6 λ 0 and its height is 2.2 λ 0. The results predicted by numerical simulations indicate that the antenna system has highest peak directivity of 21 dBi. The beam can be scanned to any direction within a cone having an apex angle of 20 °.

50 citations

Journal ArticleDOI
TL;DR: In this paper, a methodology to synthesize a low-profile composite-dielectric phase-correcting structure (CD-PCS) is presented, in which a higher permittivity dielectric material is used in the central region of the CD, which requires a larger phase delay, while a lower permittive dielectoric material is employed in the outer region, which required a smaller phase delay.
Abstract: A methodology to synthesize a low-profile composite-dielectric phase-correcting structure (CD PCS) is presented. The CD PCS, in function, is similar to an all-dielectric varying-height PCS and transforms a nonuniform aperture phase distribution of a low-gain antenna to a nearly uniform phase distribution. The methodology is aimed at reducing the maximum height of all-dielectric PCSs by using a combination of commercially available transmissive dielectric materials. The principle of operation has been demonstrated by designing a CD PCS using two dielectric materials. A higher permittivity dielectric material is used in the central region of the CD PCS, which requires a larger phase delay, while a lower permittivity dielectric material is used in the outer region, which requires a smaller phase delay. The height of the CD PCS is 43 $\%$ less and its weight is 25 $\%$ less than the single-dielectric PCS, but both have similar radiation performance.

35 citations

Proceedings ArticleDOI
19 May 2019
TL;DR: In this paper, a narrow high-efficiency pass-band all-dielectric metamaterial frequency selective surface (FSS) using ceramics material is designed, and the effective permittivity, effective permeability and the normalized impedance are extracted and the electric fields and magnetic fields are observed to analyze the FSS.
Abstract: In this paper, a narrow high-efficiency pass-band all-dielectric metamaterial frequency selective surface (FSS) using ceramics material is designed. The pass band working in 8.92GHz-9.16GHz. The effective permittivity, effective permeability, and the normalized impedance are extracted and the electric fields and magnetic fields are observed to analysis the FSS. The result shows that the all-dielectric metamaterial FSS can be designed by adjusting its resonance modes and impedance match. This kind FSS can realize the properties the metallic FSS have and can also behavior the advantages of the all-dielectric materials, such as high temperature and high power. It has huge academic value and potential engineering application.

5 citations


"An Illustration of a novel All Diel..." refers methods in this paper

  • ...An FSS based band pass filter [2] made of dielectric material has been designed from 8....

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