Reflector (antenna)

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

Infrared vision with liquid crystal display device

Abstract: Various embodiments related to infrared vision for a liquid crystal display (LCD) device are disclosed herein. For example, one disclosed embodiment provides a display system, comprising an LCD device and a display backlight configured to illuminate the LCD device by directing visible light toward an interior surface of the LCD device. The display system further comprises a wavelength-selective reflector disposed between the display backlight and the LCD device and having a smooth surface facing the interior surface of the LCD device, where the wavelength-selective reflector has a wavelength- selective coating configured to cause incident visible light from the display backlight to be transmitted through the wavelength-selective reflector to the LCD device, and cause incident infrared light reflected from an object on or near an exterior surface of the LCD device to be reflected off of the wavelength-selective reflector and directed to an infrared vision subsystem.

Directing and concentrating solar energy collectors

Abstract: A directing and concentrating solar energy collector with a concentrating reflector and one or more cooperating directing reflectors concentrates solar radiation to a substantially narrow and straight line of concentration The directing reflectors, being perpendicular to the concentrating reflector, confine the zones of concentration at the line of concentration A stationary optimizing energy converter having multiple energy conversion sections receives the concentrated radiation, converts part of it to electricity, with another part to thermal energy A building includes multiple collectors in an energy collection system, with one variation of the collectors used under a transparent roof and another inside a transparent wall The concentrating reflector is provided either with single axis tracking, or with no tracking at all, enabling different installations and having different advantages For the tracking versions, a radiation scanner digitally measures and computes the most optimal angular tracking position for accurate adjustment of the concentrating reflectors, yielding the highest available energy level Software in a micro processor controls the collection system and the conversion sections, independently from each other, optimizing the energy collection process The software also reads radiation energy levels from the radiation sensors of the scanner, at regular angular intervals of the rotation of the rod, and computes the most optimal angular tracking adjustment for positioning of the concentrating reflectors of all collectors

Omnidirectional and directional antenna assembly

Abstract: An antenna assembly providing selectable omnidirectional or directional reception of radio transmissions in a frequency band in accordance with the invention includes an electrically conductive reflector (432) defining a cavity (702) having a bottom (708), an opening (714) and a surface (704 and 706) extending from the bottom to the opening and an electrical output (763); an electrically conductive loop (431) coupled to ground and having an electrical outlet (766) for coupling to an RF amplifier (407), the loop being positioned between the bottom opening of the cavity; a RF switch (406) having an input (760) and first and second outputs (762 and 764), the RF switch having a first switching state electrically connecting the input to the first output and a second switching state electrically connecting the input to the second output, the first switch output being electrically coupled to ground and the second switch output being electrically coupled to the output of the electrically conductive loop; and wherein the first switching state provides the directional reception and the second switching state provides the omnidirectional reception of the radio transmissions.

74 nm wavelength tuning range of an InGaAsP/InP vertical grating assisted codirectional coupler laser with rear sampled grating reflector

Abstract: A vertical-grating-assisted codirectional coupler laser with rear sampled grating reflector (GCSR laser) combines single-mode operation over a very wide tuning range of 74 nm with a side-mode suppression of better than 30 dB over most of the wavelength span. The total tuning span is limited by the combined bandwidths of the active material gain curve and the envelope of the sampled grating reflection peak spectrum, while the tuning capacity of the directional coupler filter alone is estimated to be at least 140 nm. >

A curved field reflectron time‐of‐flight mass spectrometer for the simultaneous focusing of metastable product ions

Abstract: The ability to simultaneously focus a wide mass range of metastable fragment ions formed after the initial ionization event in a matrix-assisted laser desorption/ionization time-of-flight mass spectrometer has been made possible by the development of a new type of ion reflector. This coaxially designed time-of-flight instrument employs a modified single stage reflector whose axial voltage gradient rises differentially in order to produce an alignment of energy focal points for product ions. In contrast, product-ion focusing in conventional constant field reflectors occurs over a broad range of distances from the reflectron exit. Approximately 90% of the product-ion mass spectrum can be collected without adjustment, thereby eliminating the need to scan the reflector voltage. Design considerations of the curved field reflectron, its calibration properties and representative metastable spectra of several peptides are discussed.