Reflector (antenna)

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

Compact micro-concentrator for photovoltaic cells

Abstract: A reflector array comprises a plurality of partial parabolic reflectors arranged in rows and columns with each reflector directing radiation to a receiver or from a transmitter located at the focus of the reflector. In a compact photovoltaic cell arrangement, each cell is shielded from direct radiation by the adjacent reflector. The reflectors can be formed as one unit with reflective material or with the reflecting surfaces coated with aluminum, silver, or other suitable reflecting material. A secondary reflector can be positioned at the focus of a reflector for directing radiation to a receiver or from a transmitter located at a more accessible location in the array.

Imaging and suppressing near-receiver scattered surface waves

Abstract: When traveling through a complex overburden, upcoming seismic body waves can be disturbed by scattering from local heterogeneities. Currently, surface-consistent static and amplitude corrections correct for rapid variations in arrival times and amplitudes of a reflector, but these methods impose strong assumptions on the near-surface model. Observations on synthetic and laboratory experiments of near-surface scattering with densely sampled data suggest that removing noise from near-receiver scattering requires multichannel approaches rather than single-channel, near-surface corrections. In this paper we develop a wavefield-based imaging method to suppress surface waves scattered directly beneath the receivers. Using an integral-equation formulation, we account for near-surface heterogeneities by a surface impedance function. This impedance function is used to model scattered surface waves, excited by upcoming wavefronts. The final step in our algorithm is to subtract the scattered surface waves. We succes...

Head-up display device

Abstract: A head-up display device having an excellent appearance, which has a simple structure and an excellent design upon both nonuse and use, is provided A cover having a shape equivalent to that of an aperture formed on an upper surface of a housing is attached on an upper surface of a retractable reflector The cover slides on the upper surface of the reflector cooperating with a retractable motion of the reflector, thereby performing the opening and closing action of the aperture When the reflector takes its falling-down posture, the reflector and its rotation shaft can be shielded from an eye range and the number of the parting lines can be reduced

Position tracking system

Abstract: An optical position tracking system that tracks the position of objects, using light intensity and/or frequency with the application of geometry and ratios of detector responses, is provided, having light distributing and light detecting components that employ the concepts of constructive occlusion and diffuse reflection. Diffusely reflective cavities, masks and baffles are used to improve certain radiating characteristics of the distributing components and certain response characteristics of the detecting components, to tailor the radiation and detection profiles thereof, including them substantially uniform for all angles within a hemispheric area which the distributing and detecting components face. The distributing and/or detecting components are partitioned with specially-configured baffles. A partitioned distributor has distinct emission sections where the sections can emit spectrally-different or distinguishable radiation. A partitioned detector has distinct detection sections where the sections can detect radiation from different directions. The system may be variously configured, to use different combinations of partitioned and nonpartitioned devices. In most configurations, a single head module provides one set of directional data about two coordinates (e.g., ρ and Θ) for one reflector. An additional head module remotely positioned from the first head module can provide a second set of directional data for the reflector (e.g., ρ2 and Θ2), for cross-referencing with the first set of directional data to obtain positional data in three dimensions of the object being tracked. The system can also track multiple objects, using spectrally-different (or at least spectrally distinguishable reflectors) in conjunction with correspondingly spectrally-compatible sensors to distinguish between data collected for each reflector. Numerous variations particularly on the concept of constructive occlusion may be accomplished with varying results as desired or appropriate. By reconfiguring the radiation/detection surface, the cavity, the mask and/or the baffle, the radiation/detection profile may be varied in substantially unlimited ways.

Cylindro-parabolical solar energy collector

Abstract: This collector comprises a reflector (1) formed by a plurality of reflecting elements (6) engaged between consecutive frames (2). Each of the frames is formed by two members (7) moulded from Zanak and fixed to an aluminium beam (11) having a triangular cross-sectional shape. Each pair of members (7) defines arms (17) whereby the reflector is rotatively mounted on a fixed absorber tube (3). The latter is protected by a transparent hood (28) fixed on supports (4) disposed on each side of the reflector. A device (34, 35, 37) for adjusting the angular position of the reflector is provided at at least one end of the collector.