Topic
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.
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13 Mar 2019
TL;DR: In this paper, a parabolic lens, fabricated using focused ion beam milling, with a diameter of 15 μm and height of 5 μm, was embedded 6.5 μm below the endfacet of the optical fiber.
Abstract: This work demonstrates an approach for simplifying fiber-to-chip (edge coupling) packaging by virtually eliminating the longitudinal alignment procedure (also increasing compactness and efficiency) through a fiber lens embedded into the structure of the fiber itself. A parabolic lens, fabricated using focused ion beam milling, with a diameter of 15 μm and height of 5 μm, was embedded 6.5 μm (the working distance of the parabolic lens) below the endfacet of the fiber. The lens focuses a 10.4 μm fiber mode into a spot size of 2.6 μm on the surface of an SMF-28e single-mode optical fiber. The properties of the fabricated lens were studied using the three-dimensional finite-difference time-domain numerical method, and the optimal parameters for maximizing the coupling conditions were extracted. The conversion loss of the lens is estimated to be around . The insertion loss and lateral alignment of the proposed parabolic lens is comparable to a commercial lensed fiber, while directly ensuring the longitudinal alignment, easing the angular alignment, and providing additional mechanical and environmental robustness.
9 citations
TL;DR: In this paper, the phase of the elements of a phased array feed is optimized to yield a maximum directivity for front fed and offset cylindrical parabolic reflector antennas, especially for front-fed reflectors with larger feeds.
Abstract: The phase of the elements of a phased array feed is optimized to yield a maximum directivity for front fed and offset cylindrical parabolic reflector antennas. Calibration improves the reflector antenna performance, especially for front fed reflectors with larger feeds.
9 citations
TL;DR: In this paper, the transverse parabolic shape of the reflecting surface in the non-tracking solar concentrator has been modified so that the illumination at the receiver is exactly uniform for certain angles of incidence and reasonably uniform for other angles.
9 citations
Patent•
24 Oct 2012TL;DR: In this article, a lighting unit is provided with: LED arrays in which light-emitting elements are positioned in an array in a main scanning direction; cylindrical parabolic mirrors that project light emitted from the LED arrays on an illumination region of an illuminated item; and a housing that houses or holds the LED array and the cylinrical paraboloid mirrors.
Abstract: A lighting unit is provided with: LED arrays in which light-emitting elements are positioned in an array in a main scanning direction; cylindrical parabolic mirrors that project light emitted from the LED arrays on an illumination region of an illuminated item; and a housing that houses or holds the LED arrays and the cylindrical parabolic mirrors. Each cylindrical parabolic mirror forms a shape in which a cylindrical paraboloid having curvature with respect to a sub-scanning direction has been clipped by an axial plane that is perpendicular to the vertex of the cylindrical paraboloid in the main scanning direction. The LED arrays are positioned so as to include the focal position of the cylindrical paraboloid in the light-emitting region, the central axis in the light-emitting direction being perpendicular to the axial plane.
9 citations
TL;DR: In this article, the temporal characterization of reflector antennas based on the determination of the transient antenna response together with a useful definition of the early-time antenna radiation pattern is presented.
Abstract: This work presents some important concepts for the temporal characterization of reflector antennas based on the determination of the transient antenna response together with a useful definition of the early-time antenna radiation pattern. The concepts are useful in the analysis and design of reflector antennas intended for high resolution radars and for high capacity digital, and UWB communication systems. 2008 Elsevier GmbH. All rights reserved.
9 citations