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.

Composite rooftop antenna for terrestrial and satellite reception

Abstract: An antenna structure includes a plurality of vertical directed antennas mounted on an insulated cylindrical substrate. A parabolic reflecting antenna is mounted at one end of the cylindrical substrate cavity and a dielectric lens admits radiation through the cylindrical cavity to the parabolic reflector. Optical detectors are located on the cylindrical substrate periphery and exposed to optical signals through an InfraRed (IR) optical filter.

Matrix solar dish

Abstract: A matrix solar dish concentrator with flexed glass mirrors is patterned from orthogonal planes parallel to the axis of symmetry of a paraboloid and intersecting the paraboloid, this pattern making all parabolic trusses uniform. Parabolic trusses are made by flexing linear truss members with lateral forces creating accurate parabolic member curves, restraining the flexed members with rigid webbing to form an orthogonal paraboloid frame. Parabolic glass mirrors are made by flexing slender flat glass mirrors with lateral forces creating accurate parabolic mirror curves, restraining the flexed mirrors with tension buttons connected to the orthogonal paraboloid frame to form a solar dish. Glass mirror structural substrates are not used. The solar dish tracks the solar azimuth with a bicycle wheel and tracks the solar zenith with a television satellite dish actuator. A solar receiver is supported with a low shade structure outside a cone of concentrated sunlight. Uniform flux is greater than 1000 suns and suitable for high-intensity photovoltaic cells and district heating systems.

Optical system for lsi manufacturing contraction projection aligner by light

Abstract: PURPOSE:To obtain a mirror type stepper in which a short wavelength ultraviolet ray is used as a light source and which has a deep focal depth, a wide exposure area and a large numerical aperture. CONSTITUTION:A light source is mounted at one focal point of a rotational elliptical concave mirror, the small hole 8 of the mirror 7 is mounted at the other focal point, and the hole 8 also becomes a focal point of a parabolic mirror 10. A high coherent light is used as a light source thereby to deepen a focal depth, to remove various aberrations and to improve an effective numerical aperture. Further, a reticle image is increased larger than an image on a wafer and the width of the wavelength of an illumination light is increased thereby to prevent deterioration of the image due to the use of the coherent light. In this case, its resolution is improved when transparent liquid is filled between optical systems.

Excitation system for an antenna with a parabolic reflector and a dielectric radiator

Abstract: An excitation system which can be used with sector antennas which do not have circular reflectors is described. The reflector is designed as a rectangular strip which curves parabolically in the direction of its long axis to form a sector antenna. The end face of the radiator has four partial faces which form equal pairs and their opposing faces are arranged with respect to the central axis of the hollow conductor so that the surfaces of the two pairs extend at approximately right angles to each other. The partial faces of the radiator extending in the direction of the long axis of the reflector are large in relation to the two partial faces extending crosswise thereto.