633 results about "Radiation mode" patented technology

An RFID system includes a hybrid backscatter-based RFID tag protocol-compatible with existing 802.11x/Bluetooth Standards as well as RFID standards. The tag is linked to a multi-protocol Interrogator via a generated RF Continuous Wave (CW) field. The tag includes an antenna coupled to an RFID and a Bluetooth/802.11x transceiver section. A Protocol Processor services RFID and transceiver sections and is coupled to the antenna via a backscatter switch. The Interrogator can switch the tag to an RFID backscatter radiation mode where the processor switches the antenna impedance to reflect the CW signal. For transceiver operation the processor switches antenna impedance in synchronization with a frame organized bit stream. For reception, the RFID section utilizes demodulation techniques, typically Amplitude Shift Keying (ASK), and provides a wake up mode within a predetermined distance of the Interrogator. The transceiver may operate in a backscatter or regular mode as directed by an Access Point.

The invention discloses a dipole antenna of an RF chip, comprising two metal sheets, a feeder line and an earth wire, wherein two tabulate metal sheets are mutually parallel and are both provided with short circuit points which are respectively used for connecting the feeder line and the earth wire. The dipole antenna of the RF chip of the invention integrates novel artificial electromagnetic materials, thus the dipole antenna has abundant chromatic dispersion characteristics so as to form various radioactive modes, which not only can avoid fussy impedance matching network, but also can tune by adjusting a feeder line feeding and coupling mode, an earth wire accessing mode, the topological structure of metal microstructure, the position of metalizing through holes as well as the short circuit point position among the feeder line, the earth wire, an upper layer of sheet metal and a lower layer of sheet metal, thus providing great convenience for multiple frequency point impedance matching; meanwhile, the dipole antenna of the invention adopts a chip mode to fully utilize radiating area to approach to the Chu Limit antenna dimension limit principle, the construction of double chips also brings technical advantages for limiting electromagnetic wave and reducing effect on antenna operation by the outside.

A solid state (light emitting diode) lamp in numerous configurations have improved thermal management by providing a direct thermal pathway from the plurality of LED chips to the threaded screw base (standard 100˜240 VAC lamp socket), or power coupling. The control circuitry is disposed opposite the printed circuit board and LED chips with respect to the heat sink so that the heat sink is interposed between the printed circuit board and the control circuitry. The LED chips are powered using a high voltage/high current configuration. The light radiation pattern is infinitely adjustable (very wide through very narrow) via a system of easily interchangeable lenses. The solid state lamps can be mass produced rapidly at significantly lower cost with very high luminous intensity. ESD protection may be included to protect the LED chips from electrostatic discharge damage.

An embodiment of the invention relates to a digital integrated antenna array system having one or more antenna modules, one or more transceiver modules each having one or more signal processing paths for transmitting data to or receiving data from the one or more antenna modules, a signal processing unit able to process data for each the one or more signal processing paths of the one or more transceiver modules such that the data transmitted from the one or more transceiver modules to the one or more antenna modules is radiated by the one or more antenna modules into one or more radiation patterns.

A device for directing energy to a target volume of tissue includes an antenna assembly and an elongated body member. The elongated body member includes a proximal end portion and a distal end portion, wherein the proximal and distal end portions define a longitudinal axis. The elongated body member has a chamber defined therein that extends along the longitudinal axis, and a body wall surrounding the chamber. An antenna assembly is disposed in the chamber. The elongated body member also includes an opening in the body wall to allow energy radiated from the antenna assembly to transfer into the target volume of tissue.

Proposed is an illumination device (1), comprising a semiconductor light source (10) for generating light, a primary optical system (20) for feeding the light to a secondary optical system (30), which is provided for radiating the light and for achieving a desired radiation pattern. The semiconductor light source may comprise LEDs and/or Laser-Diodes. The primary optical system comprises a light-guide with a mirrored end-face (24) and an out-coupling structure (25) for directing light into the secondary optical system. The mirrored end-face optically folds the light-guide, effectively extending the length over which the light is advantageously homogenized inside the light guide. Furthermore, optically folding the light-guide makes more economical use of the space inside the secondary optical system. This is especially advantageous when designing an LED based retrofit for existing form factors of halogen based illumination devices.

A device for a wireless RF link to a remote receiving device can radiate at different radiation patterns in response to detecting a change in the device position. As the device is moved, displaced, or re-positioned, a position sensor in the device detects the change in position and provides position information to a processor. The processor receives the position information from the position sensor, selects an antenna configuration and physical data rate based on the position information, and provides an RF signal associated with the selected antenna configuration through the antenna elements of the selected antenna configuration.

A dual polarized variable beam tilt antenna (10) having a plurality of offset element trays (12) each supporting pairs of dipole elements (14) to orient the dipole element pattern boresight at a downtilt. The maximum squint level of the antenna is a consistent downtilt off of boresight and which is at the midpoint of the antenna tilt range. The antenna provides a high roll-off radiation pattern through the use of Yagi dipole elements configured in this arrangement, having a beam front-to-side ratio exceeding 20 dB, a horizontal beam front-to-back ratio exceeding 40 dB, and is operable over an expanded frequency range.

A backhaul radio is disclosed that includes one or more antenna structures collectively having a plurality of selectable radiation patterns for detecting alignment signals; one or more receivers configured to receive the alignment signals from the one or more antenna structures and provide received signals; one or more processors for processing the received signals to determine signal properties, wherein at least one of the one or more processors are coupled to at least one of the one or more receivers to receive said received signals; and an interface to couple at least one of the one or more processors to an alignment assisting device. The alignment assisting device coordinates between the backhaul radio and the second backhaul radio during the alignment process. The alignment assisting device further provides an indication of an improved alignment adjustment to a user of the alignment assisting device.

In a wireless network comprising access points deployed within a designated zone of coverage, the radio frequency field strength resulting from radiation from the access points is optimised as a function of location by means of control of the transmission power and/or radiation pattern of the access points in response to measurements from sensors at defined locations that measure received signal power, the received power being related to radio frequency field strength. Sensors may be deployed within the designated zone of coverage, at the edge of the zone and/or outside the zone and optimisation of the transmission parameters of the access points in terms of transmission power and/or radiation pattern is carried out taking into account the location of the sensors in addition to the received power at the sensors.

Provided is a light emitting structure which can emit light having a plurality of wavelength distributions from a single light emitting structure, can be integrated at high density, and can control a radiation mode pattern of radiation light and polarization thereof. A stacked three-dimensional photonic crystal is composed of a plurality of three-dimensional photonic crystals having photonic band gaps different from one another, which are stacked. Each of the plurality of three-dimensional photonic crystals includes a resonator in which a point defect is formed.

The invention presented relates to wireless handsfree head worn headset computing devices including a microdisplay device and spatially diverse antenna system. The spatially diverse antenna system provides an effective headset computing device radiation pattern that enables arbitrary user movement and promotes freedom of mobility. Disclosed is a headset computing device including a head worn frame having a profile relatively low in height with respect to a user's head, the user's head creating a RF shadow region along the headset profile by blocking line-of-sight RF propagation paths, the headset includes two or more antennas integrated with the headset frame to sufficiently maintained its low profile. Each antenna has a radiation pattern and are collectively arranged to form an omnidirectional radiation pattern, where at least a first radiation pattern provides coverage in the line-of-sight propagation path while the at least second radiation antenna pattern is in the RF shadow region.

An active antenna system and algorithm is described that provides for improved performance from LTE communication systems operating in Category 1 mode, where one antenna is used. For the LTE SISO case (category 1), a modal antenna capable of generating multiple radiation patterns will provide improved throughput due to improved resistance to fading. Modal (Null Steering) antenna technology is implemented in a multi-antenna system to provide for single and multiple antenna operation wherein one or more antennas have two or more radiation modes. An algorithm has been developed that determines when to switch from SISO to MIMO operation.

A modal antenna is proposed that provides for dynamic tuning and optimization of antenna system parameters for SAR (Specific Absorption Rate) management in mobile wireless devices. A modular approach is described where the radiator and active components are integrated into a module, allowing the fixed radiator to be used across multiple wireless products and form factors. Multiple radiation modes can be generated by a single antenna structure with one or several of the modes designed to minimize SAR while maintaining efficient communication link performance. Proximity sensors or other sensors provide indicators to determine when mode selection is necessary.

The invention relates to a radiation refrigeration fiber, a preparation method thereof and an application of the fiber. The radiation refrigeration fiber comprises a base and functional fillers fixedly distributed in the base, the mass percent of the functional fillers in the radiation refrigeration fiber is 1%-17%, the linear density of the radiation refrigeration fiber is 0.3dtex-10dtex, the radiation refrigeration fiber can reflect visible light and near-infrared light, and heat is emitted by an atmospheric window in an infrared radiation mode. The visible light and near-infrared light reflectivity of a radiation refrigeration fabric prepared from the radiation refrigeration fiber is higher than or equal to 60%, and the emissivity of 7-14 micrometers is higher than or equal to 80%. Therefore, the radiation refrigeration fabric can be further used for preparing textile products such as clothes, curtains, tents, sunshades, hats, scarves, car covers and hoods with cooling requirements,comfort and breathability of the textile products are kept, cooling can be realized by the aid of the textile products, comfortable feeling is increased, energy consumption is omitted, energy is saved, and environments are protected.

The invention provides an optical modulator wherein appearance of radiation mode light can be suppressed to improve performances as a device. The optical modulator includes a multiplexing waveguide which in turn includes two input waveguides to which propagation lights from a linear waveguide are inputted, a waveguide coupling element, and two output waveguides. The width of the waveguide coupling element on the input side is greater than the total width of the two input waveguides, and the width of the waveguide coupling element on the output side is greater than the total width of the two output waveguides. The device of the present invention is applied typically to an optical communication system.

The invention discloses a drilling machine, which comprises a motor and a machine needle, wherein the machine needle is provided with a point heating device, and is made of stainless steel; and the point heating device gradually heats in a radiation mode. The drilling machine has the advantages that: good marks can be left, and the influence of the loose degree of cloth is avoided.

The instant invention concerns optical fibers that have complex-valued Vc-parameters due to gain g established by active dopants that are doped into the fiber core in accordance with a doping profile. In particular, the doping levels are very high, such that the gain g makes a sufficiently large contribution to an imaginary part of the complex-valued Vc-parameter to define at least one gain-guided mode, e.g., the fundamental mode or several low-order modes of radiation in the optical fiber. The fiber does not require any index-guiding effects to a single mode or just a few of the lowest-order modes in large cross-section cores having diameters in the range from 50 mum to 500 mum in diameter and yield kilowatt level output power. The fiber may, in addition to gain-guiding, take advantage of a refractive index profile to provide for index-guiding or index-antiguiding effects in addition to gain-guiding.

A dual radiation patterns antenna is provided in the present invention. The dual radiation patterns antenna includes a substrate, a first antenna unit and a second antenna unit. The substrate has a first surface and a second surface opposite to the first surface. The first antenna is formed on the first surface of the substrate and used to radiate a first radiation pattern. The second antenna is formed on the second surface of the substrate and used to radiate a second radiation pattern. A first vertical projecting plane of the first antenna unit on the second surface is overlapped with the second antenna unit completely or partially. A second vertical projecting plane of the second antenna unit on the first surface is overlapped with the first antenna unit completely or partially. The first radiation pattern and the second radiation pattern are perpendicular each other.