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Reflector (antenna)

About: Reflector (antenna) is a research topic. Over the lifetime, 28730 publications have been published within this topic receiving 212618 citations.


Papers
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Patent
04 Dec 2005
TL;DR: In this article, a first reflector and a second reflector define an optical cavity and select a visible wavelength at an intensity by optical interference, and a mechanism to allow optical properties of the optical cavity to be varied in correspondence with the pixel of the displayable image.
Abstract: An electronic device of an embodiment of the invention is for at least partially displaying a pixel of a displayable image. The electronic device includes a first reflector and a second reflector that define an optical cavity therebetween, and which is selective of a visible wavelength at an intensity by optical interference. The electronic device also includes a mechanism to allow optical properties of the optical cavity to be varied. The visible wavelength and/or the intensity are thus variably selectable in correspondence with the pixel of the displayable image.

53 citations

Journal ArticleDOI
TL;DR: The discovery and the microwave-assisted characterization of a natural system that achieves excellent optical broadband reflectivity but that is less than 1 μm thick is reported, found on the wing scales of the butterfly Argyrophorus argenteus.
Abstract: Broadband optical reflectors generally function through coherent scattering from systems comprising one of three designs: overlapped; chirped; or chaotic multilayer reflectors. For each, the requirement to scatter a broad band of wavelengths is met through the presence of a variation in nanostructural periodicity running perpendicular to the systems’ outer surfaces. Consequently, the requisite total thickness of the multilayer can often be in excess of 50 mm. Here, we report the discovery and the microwave-assisted characterization of a natural system that achieves excellent optical broadband reflectivity but that is less than 1 mm thick. This system, found on the wing scales of the butterfly Argyrophorus argenteus, comprises a distinctive variation in periodicity that runs parallel to the reflecting surface, rather than perpendicular to it. In this way, the requirement for an extensively thick system is removed.

53 citations

Patent
30 Mar 2012
TL;DR: In this article, a light emitting diode (LED) floodlight is described, which can include a LED housing assembly coupled to a driver assembly, where the driver assembly couples to the end of the heat sink protrusions that extend from the back side of the LED housing.
Abstract: A light emitting diode (LED) floodlight is described herein. The LED floodlight can include a LED housing assembly coupled to a driver assembly. The LED housing can include a number of LEDs mounted on a front side of a LED housing and a number of heat sink protrusions extending from a back side of the LED housing. The driver assembly can include a driver mounted within a driver housing, where the front side of the driver housing couples to the end of the heat sink protrusions that extend from the back side of the LED housing. The LEDs may be coupled to a number of reflectors. The reflectors can include a reflector body having a top portion and a bottom portion. The top portion can form a shape that is an elongated version of the shape formed by the bottom portion.

53 citations

Patent
03 Jan 2000
TL;DR: In this article, a spatial light modulator pixel comprises a movable reflective surface in which an array of sub-apertures is formed, wherein each subaperture contains a fixed (non-movable) island reflector.
Abstract: A spatial light modulator pixel comprises a movable reflective surface in which an array of subapertures is formed, wherein each subaperture contains a fixed (non-movable) island reflector. The movable reflector is micromechanically actuated so that the combination of movable and fixed reflectors functions alternately as a plane mirror or as a two-dimensional diffraction grating (i.e., a “bigrating”), depending on the movable reflector's position. The device is useful for applications such as maskless lithography and high-resolution printing.

53 citations

Journal ArticleDOI
TL;DR: The current state of the reflector antenna art is presented in the form of a review article, intended primarily for engineers who are new in the field and focused on specific hardware examples for each principle or concept.
Abstract: The current state of the reflector antenna art is presented in the form of a review article, intended primarily for engineers who are new in the field. The properties of paraboloidal antennas are related to aperture efficiency, surface tolerance, feed defocusing, and aperture blocking. Other reflector shapes considered are offset-fed paraboloids, classical and offset Cassegrain systems, shaped-dual reflectors, and scanning reflectors. Properties of contoured-beam systems are reviewed. Structures and materials are reviewed for ground stations and satellite-borne reflectors. Emphasis is placed on specific hardware examples for each principle or concept. Near-field probing, dichroic surfaces, and techniques of surface metrology are presented as examples of promising areas for new developments.

53 citations


Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20224
2021567
2020948
20191,159
20181,092
2017977