61 results about "Reradiation" patented technology

A backscatter transponder for an HF communication system with modulated reradiation, is provided that includes an antenna for receiving high-frequency carrier signals, wherein the antenna has reflective characteristics, a control unit for providing transponder-specific parameters, and a modulator that can be driven by the control unit. The modulator altering the reflective characteristics of the antenna in accordance with at least one transponder-specific parameter.

A method for concentrating radio frequency (RF) radiation on an object located in proximity to a reflector includes the steps of: selecting a target reflector and a level of power for conveying to the target reflector by reradiation from the target reflector, determining a resonance profile of the target reflector, the resonance profile including at least one resonant frequency of the target reflector, selecting a transmission profile matching the resonance profile, the transmission profile comprising the at least one resonant frequency, and transmitting RF radiation in accordance with the transmission profile towards the target reflector.

A reradiation antenna including an insulation panel; a ground contact formed on one side of the insulation panel; a slot formed by eliminating a part of the ground contact by exposing the insulation panel; a power feeding unit formed on the insulation panel between the slot and separated from the ground contact and connected with a power source using a first end of the power feeding unit; and a radiation unit formed on one side of the insulation panel, and connected with a second end of the power feeding unit positioned at an opened end of the slot.

A cross-direction dryer for typically drying a continuous web of paper or paper to which coating has just been applied provides both for baseline drying and a linear moisture profile by the use of respectively gas and electric heating portions of the heater units. Profile control is normally provided by control of the voltage to electric heating lamps. Such heating lamps are suspended over a large area gas burner to provide a combined increased infrared heat output. Encapsulation of the heating lamps with quartz provides for reradiation of the medium wavelength radiation produced by the gas burner. Thyristor switching for the quartz halogen heat lamps may be located adjacent to each heater unit and cooled by the combustion air for the gas burners.

An antenna apparatus, which can increase capacity in a cellular communication system or Wireless Local Area Network (WLAN), such as an 802.11 network, operates in conjunction with a mobile subscriber unit or client station. At least one antenna element is active and located within multiple passive antenna elements. The passive antenna elements are coupled to selectable impedance components for phase control of re-radiated RF signals. Various techniques for determining the phase of each antenna element are supported to enable the antenna apparatus to direct an antenna beam pattern toward a base station or access point with maximum gain, and, consequently, maximum signal-to-noise ratio. By directionally receiving and transmitting signals, multipath fading is greatly reduced as well as intercell interference.

Methods, algorithms, architectures, circuits, and/or systems for managing POR-less integrated circuits are disclosed. The method of validating code from a wireless device can include: (i) broadcasting a signal from a reader to the wireless device, (ii) reading a code transmitted, re-radiated, and/or backscattered from the wireless device, the code having a predetermined quality, characteristic, and/or property, (iii) comparing the code to a reference quality, characteristic, and/or property, and (iv) validating the code when the predetermined quality, characteristic, and/or property matches the reference quality, characteristic, and/or property. Embodiments of the present invention can advantageously provide a reliable approach for validating integrated circuits that do not incorporate a POR circuit, and which therefore may transmit spurious bits of data upon being energized. In addition, embodiments of the present invention advantageously allow an Aloha-type anti-collision function to be implemented in a reader based on POR-less integrated circuits.

A training sequence is pre-filtered in a radiocommunication system having an emitter in the form of an antenna device with several antenna systems, thereby making it possible to transmit the training sequences through a pre-filter to said antenna systems side for reradiation by the emitter. Estimation enabling to form the properties of radio transmission channels described by spatial correlations is formed. Said prefilter is dimensioned according to said correlations, thereby minimizing the error value of an algorithm used for estimation the channel on a reception side.

An antenna comprising a plurality of re-radiating elements arranged in at least one plane being parallel to a fixed surface. The arrangement is adapted such that electromagnetic radiation emitted from the re-radiating elements in response to electromagnetic radiation arriving from a predetermined direction interferes constructively at a feed location. Additionally, the antenna comprises a feed provided at the feed location. In a method of manufacturing an antenna, the arrangement of the plurality of re-radiating elements may be calculated and the re-radiating elements can be provided in the at least one plane substantially parallel to the substrate. An apparatus for manufacturing an antenna may comprise a data processor adapted to calculate the arrangement of the plurality of re-radiating elements and means for forming the plurality of re-radiating elements.

According to an embodiment of the present invention, a reradiation repeater may comprise a dielectric substrate, a ground conductor provided on a surface of the dielectric substrate, and a plurality of unit cells provided on another surface of the dielectric substrate, wherein the unit cells reradiate radio waves in the same direction by directing the radio waves which are incident onto the unit cells at different angles to a same direction. The reradiation repeater may facilitate to select, e.g., an installation location and secure a good reradiation capability even when the installation environment is changed (e.g., a variation in the installation location of base station facility), contributing to coverage of a shadow zone. The reradiation repeater may be implemented in various manners according to embodiments of the present invention.

The solar absorber is equipped with an absorber body (10) that absorbs incident solar energy (12) and converts it to heat. The absorber body has a selective absorption layer (17) on a side (36) oriented toward the concentrator (13) and another selective absorption layer (18) on an opposite side (38) oriented away from the concentrator (13). The selective absorption layers (17, 18) have threshold wavelengths below which solar radiation is absorbed and above which a reradiation capacity of the absorber body is suppressed. The threshold wavelength of the selective absorption layer (17) on the side (36) of the absorber body that is oriented toward the concentrator is greater than the other threshold wavelength of the other selective absorption layer(18) on the opposite side (38) of the absorber body oriented away from the concentrator.

There is provided a glazing laminate comprising a polyvinyl butyral core layer having polyvinyl butyral/IR dye layers on each side. The dye containing layers are solvent cast from methanol onto the core layer. The dyes in each layer are different comprising BN 18 type PVB containing either 2 mg Epoline III-125 or 2 mg of Epolite III-57 dyes per grams of resin and dissolved in 10 ml of analytical grade of methanol for casting. The polymer is sandwiched between two glass layers under pressure and heat treatment at 135-140° C. An overall concentration of the dyes of ˜0.1 g/m2 results in an energy absorption over 65%. The heating effect of absorption is reduced by conduction through the polymer to the laminate edges, internal reflection, spherical reradiation and the relative insulative effect of the glass layers.

The invention discloses a thin-substrate phase amplitude correction quari-yagi difference beam planar horn antenna, and relates to a horn antenna. The thin-substrate phase amplitude correction quari-yagi difference beam planar horn antenna comprises a micro-strip feeder (2), a horn antenna body (3) and quari-yagi antennas (4), wherein the micro-strip feeder (2), the horn antenna body (3) and the quari-yagi antennas (4) are arranged on a dielectric substrate (1), the horn antenna body (3) comprises a first metal plane (7), a second metal plane (8) and two metallization through hole horn side walls (9), the horn antenna body (3) is provided with metallization through an odd number of hole arrays (11), and an even number of dielectric-loaded waveguides (15), on an aperture surface (10) of the horn antenna body (3), the widths of the dielectric-loaded waveguides (15) are equal, the dielectric-loaded waveguides (15) are connected with the quari-yagi antennas (4) which comprise active oscillators (21) and passive oscillators (22), and a left-half antenna (13) and a right-half antenna (14) are arranged symmetrically. Electromagnetic waves can reach the quari-yagi antennas in an equal-amplitude and in-phase mode and then carry out radiation, and the direction of polarization of a radiation field is parallel to the dielectric substrate; according to the thin-substrate phase amplitude correction quari-yagi difference beam planar horn antenna, the thin substrate can be adopted, and the thin-substrate phase amplitude correction quari-yagi difference beam planar horn antenna is high in gain, large in zero drawdown, low in cost and compact in structure.

The invention relates to a horn antenna, and discloses a thin substrate phase-position correcting quasi-yagi plane horn antenna. The antenna comprises a micro-strip feeder (2), a horn antenna body (3) and a plurality of quasi-yagi antennas (4), wherein the micro-strip feeder (2), the horn antenna body (3) and the quasi-yagi antennas (4) are arranged on a dielectric substrate (1). The horn antenna body (3) is composed of a first metal plane (7), a second metal plane (8) and two rows of metallization through hole horn side walls (9). Metallization through hole arrays (11) and medium filling waveguides (14) are arranged in the horn antenna body (3). Each medium filling waveguide (14) on a caliber plane (10) of the horn antenna body (3) is connected with the corresponding quasi-yagi antenna (4) composed of an active vibrator (17) and a passive vibrator (18). An electromagnetic wave can reach the quasi-yagi antennas in an in-phase mode to be irradiated, and the polarization direction of a radiation field is parallel to the substrate. According to the antenna, a thin substrate can be used for manufacturing the antenna, and the antenna is high in gain, low in cost and compact in structure.

An antenna subsystem of a communication device has an open cavity including an inner opening and lateral and outer sides that define a cavity. The cavity is sized less than required for cavity mode resonance at a millimeter-wave operating frequency. A millimeter-wave antenna element placed at the inner opening of the hollowed section cavity excites evanescent electromagnetic fields in the cavity. A slot antenna is formed in a metallic layer of the outer side of the cavity. A metallic sectioned proximity post has a first section positioned adjacent to and spaced apart from the millimeter-wave antenna element to couple to, and conduct, the evanescent electromagnetic field. The metallic proximity post has a second section positioned adjacent to and spaced apart from the slot antenna to couple at the millimeter-wave operating frequency, enabling re-radiation by the slot antenna.

The invention discloses a thin-substrate phase amplitude correction oscillator planar horn antenna, and relates to a horn antenna. The thin-substrate phase amplitude correction oscillator planar horn antenna comprises a micro-strip feeder (2), a horn antenna body (3) and a plurality of oscillators (4), wherein the micro-strip feeder (2), the horn antenna body (3) and the oscillators (4) are arranged on a dielectric substrate (1), the horn antenna body (3) comprises a first metal plane (7), a second metal plane (8) and two metallization through hole horn side walls (9), the horn antenna body (3) is provided with metallization through hole arrays (11) and dielectric-loaded waveguides (12), on an aperture surface (10) of the horn antenna body (3), the widths of the dielectric-loaded waveguides (12) are equal, and each dielectric-loaded waveguide (12) is connected with the corresponding oscillator (4). Electromagnetic waves can reach the oscillators (4) in an equal-amplitude and in-phase mode and then carry out radiation, and the direction of polarization of a radiation field is parallel to the dielectric substrate; the thin-substrate phase amplitude correction oscillator planar horn antenna can be manufactured with the thin substrate, and is high in gain, low in cost and compact in structure.

Disclosed are an antenna provided with a resonant frequency control circuit and having a design which suppresses emission (reradiation) of harmonic signals generated when the antenna receives radio waves from the outside, and a wireless communication apparatus provided with the same. A first radiating electrode (21) and a second radiating electrode (22) are provided with comb sections (COM) which generate capacitance by facing each other. If emissions of transmission radio waves from a different antenna near the antenna (101) are received, a portion will be emitted to the antenna (101), and harmonic signals will be generated by a variable capacitance element inside the resonant frequency control circuit (31). However, an LC resonant circuit (tank circuit) is formed by the inductance component of the first radiating electrode (21) and second radiating electrode (22) and the capacitance component generated at the comb sections (COM), so even if emissions from the different antenna are received, the radio waves of the basic mode are confined by the resonant frequency of the LC resonant circuit, and harmonic reradiation (spurious emission) power is reduced.

The invention provides a thin-substrate amplitude correction regular yagi planar horn antenna and relates to a horn antenna. The thin-substrate amplitude correction regular yagi planar horn antenna comprises a micro-strip feeder line (2), a horn antenna body (3) and multiple regular yagi antennas (4) which are located on a dielectric substrate (1), wherein the horn antenna body (3) consists of a first metal plane (7), a second metal plane (8) and two rows of metalized via hole horn side walls (9). The horn antenna body (3) is provided with metalized via hole arrays (11) and dielectric-loaded waveguides (14), and the dielectric-loaded waveguides (14) on the caliber face (10) of the horn antenna body (3) are identical in width and respectively connected with one of the regular yagi antennas (4) consisting of active oscillators (18) and passive oscillators (19). Electromagnetic waves can reach to the regular yagi antennas in a constant-amplitude mode and then are radiated, and the polarization direction of a radiation field is parallel to the substrate. The thin-substrate amplitude correction regular yagi planar horn antenna can be manufactured by using the thin substrate and is high in gain, low in cost and compact in structure.