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Parabolic reflector

About: Parabolic reflector is a research topic. Over the lifetime, 3375 publications have been published within this topic receiving 30735 citations. The topic is also known as: paraboloid reflector & paraboloidal reflector.


Papers
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Journal ArticleDOI
TL;DR: In this article, a photonic parabolic reflector was designed with FDTD computations using a surface-impedance formalism and compared to the directivity calculated with the FDTD simulations.
Abstract: This paper presents a study of a photonic parabolic reflector. The structure is exclusively composed of dielectric materials which are associated to build a photonic bandgap (PBG) structure with a forbidden frequency band located at the working frequency of the reflector. The dish was designed with FDTD computations using a surface-impedance formalism. The directivity of an experimental device has been measured and compared to the directivity calculated with the FDTD simulations. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 21: 411–414, 1999.

14 citations

Journal ArticleDOI
TL;DR: A simple, tractable equation is provided for determining the size and location of the circle of least confusion of a concave spherical reflector, exact for the object at infinity and with wave effects neglected.
Abstract: A simple, tractable equation is provided for determining the size and location of the circle of least confusion of a concave spherical reflector. This method is exact for the object at infinity and with wave effects neglected. Designers of large radius Arecibo-like telescopes, both radio and optical, with symmetrical, spherical primaries should find the method useful. The mathematical results are valid for apertures with an angle of incidence up to 45°. Comparisons of the location of the disk of least confusion with longitudinal spherical aberration and the radius of the disk with transverse spherical aberration are presented.

14 citations

Journal ArticleDOI
TL;DR: In this article, a direct and unambiguous approach to determine the focal point of a single offset reflector is presented based on iteratively defocusing the primary feed laterally and axially.
Abstract: A direct and unambiguous approach to determine the focal point of a single offset reflector is presented. The proposed approach makes use of the vectorial form of far-field radiation patterns, both amplitude and phase. The method is based on iteratively defocusing the primary feed laterally and axially. First, mathematical expressions of the offset reflector with a small lateral and axial defocused feed are reviewed. Then, the numerical results are presented. It is shown how the corresponding far-field phase pattern information can be utilized to optimally locate the focal point of an offset parabolic reflector. The method can also be used to place the phase center of an unknown feed on the reflector focal point, and align the reflector on a test tower.

14 citations

Journal ArticleDOI
TL;DR: In this article, three different 3D printing technologies (stereolithography, fused deposition modeling, and HP Multi Jet Fusion technology) are compared to build a parabolic reflector operating at 100 GHz.
Abstract: Three different 3-D printing technologies—stereolithography, fused deposition modeling, and HP Multi Jet Fusion technology—are compared to build a parabolic reflector operating at 100 GHz. Fabrication tolerance and surface roughness before and after metallization are accurately measured. The performance of the reflectors is measured in the near field, and it is compared against an optical grade reflector. In this way, the performance of the final product is thoroughly assessed.

14 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202338
202286
202168
202098
2019136
2018128