12941results about "Waveguide type devices" patented technology

A dielectric polyrod having at least one tapered section, where a section exposed outside of the waveguide is tapered a long a curve that depends on the dielectric constant of the material used. The invention also relates to an aperture matched polyrod antenna which includes the same and an inductive tuning element used to achieve wideband impedance match and to create a Gaussian beam in the radiating near field of the antenna, suitable to mimic a small region plane wave.

A communications apparatus comprising a first antenna, a first serial configuration of a first power amplifier and a first matching network, a second serial configuration of a second power amplifier and a second matching network, a switching element for switchably selecting the first or the second serial configuration for supplying a signal to the first antenna, the first and the second power amplifiers supplying a respective first signal of a first power and a second signal of a second power different than the first power to the first antenna for transmitting and the first and the second matching networks presenting respective first and second impedances to the respective first and second power amplifiers, the first and the second impedances responsive respectively to a power-related parameter of the first and the second signals.

A mixed-signal, multilayer printed wiring board fabricated in a single lamination step is described. The PWB includes one or more radio frequency (RF) interconnects between different circuit layers on different circuit boards which make up the PWB. The PWB includes a number of unit cells with radiating elements and an RF cage disposed around each unit cell to isolate the unit cell. A plurality of flip-chip circuits are disposed on an external surface of the PWB and a heat sink can be disposed over the flip chip components.

A millimeter-wave transmitter-receiver uses an NRD guide as a fundamental configuration and includes a millimeter-wave signal oscillator, a pulse modulator, a circulator, an antenna and a mixer. In the millimeter-wave transmitter-receiver, a line length of a third dielectric guide is set so that δ=±π in which δ is a phase difference at a center frequency between a portion of a transmission millimeter-wave signal, which is reflected via a third dielectric guide on the leading end portion of the third dielectric guide and returned to leak to a third connecting portion of the circulator, and another portion of the millimeter-wave signal, which leaks from a first connecting portion to the third connecting portion of the circulator. It is possible to reduce the change in the mixer output and enhance the millimeter-wave transmission / reception performance.

An input method that is based on bidirectional strokes that are segmented by tactile landmarks. By giving the user tactile feedback about the length of a stroke during input, dependence on visual display is greatly reduced. By concatenating separate strokes into multi-strokes, complex commands may be entered, which may encode commands, data content, or both simultaneously. Multi-strokes can be used to traverse a menu hierarchy quickly. Inter-landmark segments may be used for continuous and discrete parameter entry, resulting in a multifunctional interaction paradigm. This approach to input does not depend on material displayed visually to the user, and, due to tactile guidance, may be used as an eyes-free user interface. The method is especially suitable for wearable computer systems that use a head-worn display and wrist-worn watch-style devices.

A dual band, higher and lower frequency range transducer with a circular coaxial waveguide feed is described having a first junction for connection of a lower frequency range outer waveguide of the coaxial waveguide feed to at least two rectangular or ridge waveguides offset from the longitudinal axis of the transducer and a second junction for connection of the at least two rectangular or ridge waveguides to a further waveguide. A third junction is provided for connecting an inner waveguide of the coaxial waveguide feed to a higher frequency range waveguide. The transducer comprises at least first and second parts joined across a first plane substantially perpendicular to the longitudinal axis and including at least a portion of the higher frequency range waveguide extending within the first plane of the join. A seal such as an "O" ring seal may be placed easily in the plane of the join thus preventing moisture ingress. Similarly, a feed horn and input and output ports may be sealingly attached to the first and second parts of the transducer. The first and second junctions are preferably impedance matched turnstile junctions.

A sensor system having a sharply defined zone of active sensing comprising a compound antenna system comprising an antenna structure disposed in relation to a shield structure and spaced from the shield structure, the shield structure having an open aperture in front of the antenna structure in the direction of a lobe of sensitivity of the antenna structure. In various embodiments, the shield structure may be layered on the inside between the antenna and the shield structure with an RF absorbing material. The aperture may be formed in part by adjustable panels and the antenna spacing from the aperture may be adjustable by adjusting an antenna mounting position within the shield. The compound antenna system may be coupled to a receiver having a threshold response based on the compound antenna system response characteristic.

An enclosure for the open end of a reflector antenna includes a cylindrical shroud coupled to a distal end of the reflector antenna, the shroud generally coaxial with a longitudinal axis of the reflector antenna. A retaining band is coupled to an inner diameter of the shroud, proximate a distal end of the shroud. The retaining band is provided with a retaining groove open radially inward towards the longitudinal axis. The retaining groove provided with a bottom extending radially outward beyond an outer diameter of the shroud. A radome is seated within the retaining groove.

The antenna includes an electrically conductive antenna body having a polyhedral shape with opposing first and second ends and a medial portion therebetween. The medial portion of the electrically conductive antenna body is wider than the opposing first and second ends thereof, and the electrically conductive antenna body has a slot therein extending from at least adjacent the first end to at least adjacent the second end. The polyhedral antenna has an omnidirectional pattern, is horizontally polarized and broad in bandwidth above a lower cutoff frequency.

An F-inverted compact antenna for ultra-low volume Wireless Sensor Networks is developed with a volume of 0.024λ×0.06λ×0.076λ, ground plane included, where λ is a resonating frequency of the antenna. The radiation efficiency attained is 48.53% and the peak gain is −1.38 dB. The antenna is easily scaled to higher operating frequencies up to 2500 MHz bands with comparable performance. The antenna successfully transmits and receives signals with tolerable errors. It includes a standard PCB board with dielectric block thereon and helically contoured antenna wound from a copper wire attached to the dielectric block and oriented with the helix axis parallel to the PCB. The antenna demonstrates omnidirectional radiation patterns and is highly integratable with WSN, specifically in Smart Dust sensors. The antenna balances the trade offs between performance and overall size and may be manufactured with the use of milling technique and laser cutters.

An antenna system that includes a directional antenna designed to reduce the occurrence of side lobes, thus reducing the possibility of interference with other radio frequencies is disclosed. The directional antenna includes an antenna member and a reflecting tube. The reflective tube is sleeved over the antenna member. The reflective serves to block unwanted radial side lobes. The directional antenna can also include provisions that assist in suspending the antenna member within the reflective tube.

An improved 90° waveguide bend has the following features:the waveguide bend has two waveguide connectors located perpendicularly to each other,the waveguide connectors have a square internal cross section having an edge length (a),between the two waveguide connectors there is provided an angular portion producing the 90° change in direction,the angular portion has externally to the 90° change in direction a chamfer as a delimiting wall for the waveguide bend, the waveguide channel being outwardly delimited by the chamfer, andthe chamfer has in the plane of curvature a length corresponding to the edge length (a) of the waveguide connectors which are square in cross section, ±less than 0.5%.

A universal joint comprising a pair of circular waveguide ball-joints and a slip-joint allows for simultaneous 3-axis rotation and 3-dimensional translation between an antenna and a stationary source. As such, the universal joint does not have to be physically aligned with the azimuth, and elevation, rotation axis of the antenna and mounted on the gimbal support, greatly simplifying the antenna steering mechanism. The universal joint allows the antenna to be mass-balanced in relation to the azimuth and elevation axis without adding any additional counter weights, thus reducing the size and power requirements of the azimuth and elevation rotation drive systems. Additional ball-joints may be provided to increase the allowed range of motion of the antenna.

A switch is used in circuits which interact with electromagnetic radiation. The switch includes a substrate for supporting components of the switch. A first conductive element on the substrate is provided for connecting to a first component of the circuit, and a second conductive element on the substrate serves to connect to a second component of the circuit. A switch element is made up of a switching material on the substrate and connects the first conductive element to the second conductive element. The switching material is a compound which exhibits a bi-stable phase behavior and is switchable between a first impedance state value and a second impedance state value upon the application of energy thereto. A circuit consisting of a plurality of conductive elements includes the switch for varying current flow which has been induced by the application of electromagnetic radiation.

The invention discloses a megawatt corrugated waveguide attenuator. A first standard corrugated waveguide segment, a second smooth waveguide segment, a third mode changing waveguide segment, a fourth main attenuation waveguide segment, a fifth mode changing waveguide segment, a sixth smooth waveguide segment, a seventh mode changing waveguide segment and an eighth standard corrugated waveguide segment are sequentially arranged on a waveguide tube, wherein the first standard corrugated waveguide segment supports HE11 mode transmission, the second smooth waveguide segment achieves conversion from an HE11 mode to a TE11 and TM11 hybrid mode, the third mode changing waveguide segment achieves conversion from the TE11 and TM11 hybrid mode to an EH11 mode, the fourth main attenuation waveguide segment conducts attenuation on power, the fifth mode changing waveguide segment achieves conversion from the EH11 in the surplus power to a TE11 mode, the sixth smooth waveguide segment is used for TE11 mode transmission, the seventh mode changing waveguide segment achieves conversion from the TE11 mode to an HE11 mode, and the eighth standard corrugated waveguide segment supports HE11 mode transmission. According to the megawatt corrugated waveguide attenuator, the uniformity of the power attenuation magnitude per unit length inside the whole main attenuation segment can be achieved due to the design of periodic corrugations; due to the special design of waterways, the impact of high-flow-rate cooling water on waveguide walls can be reduced, and the consistency of the flow rate of the water in the whole water jacket can also be ensured.

In a wireless IC tag, metallic antennas are deposited as thin films on the front and back surfaces of a spacer, made of a heat-resistant glass epoxy material having a desired dielectric constant, to form a first antenna and a second antenna. An IC chip is mounted in the center of the first antenna. The second antenna functions as an auxiliary antenna for resonating to a desired frequency of a transmission radio wave of the first antenna to strengthen the intensity of the radio wave. Accordingly, even when the IC tag is mounted to a cable or the like, the tag can be mounted in the interior of the enclosure of the cable and thus the radio wave intensity of the first antenna can be prevented from being weakened by a metallic member in the cable.

A vertically stacked array antenna structure is described. The structure comprises a radiating layer, a passive layer disposed under said radiating layer, an active layer disposed under said passive layer, and an interface assembly. The radiating layer comprises an array of radiating elements. The passive layer has only passive components. At least a part of the passive components includes an array of RF duplexers corresponding to the array of radiating elements. The active layer comprises RF amplifiers. The interface assembly comprises at least one metallic frame which is in direct thermal coupling with the RF amplifiers. The interface assembly is configured for providing thermal communication of the active layer with a heat exchanger.

An antenna, including a planar dielectric substrate and a conductive ground plane formed on the substrate. A conductive monopole is formed on the substrate and has an end point located in proximity to a feed region of the ground plane. A conductive coupling element is formed on the substrate and is coupled to the ground plane at a coupling region of the ground plane. The coupling element is folded around the monopole.

The invention relates to a semiconductor device, a method of manufacturing semiconductor device, and an antenna switch module. Disclosed is a semiconductor device having a radio frequency switch. Also disclosed are an antenna switch module and a method of manufacturing the semiconductor device. The semiconductor device includes a metal wiring insulating film bonded to a silicon substrate. In the semiconductor device, a crystal defect layer extends into the silicon substrate from a surface of the silicon substrate. Crystal defects are throughout the crystal defect layer. The semiconductor device and an integrated circuit are in the antenna switch module. The integrated circuit in the antenna switch module is mounted with the radio-frequency switch device and the silicon substrate. The method of manufacturing the semiconductor device includes a step of forming crystal defects throughout a silicon substrate. Radiation or a diffusion is used to form the crystal defects. After the step of forming the crystal defects, the method includes a step of implanting ions into a surface of the silicon substrate to form a crystal defect layer.

A front feed reflector antenna with a dish reflector has a wave guide is coupled to a proximal end of the dish reflector, projecting into the dish reflector along a longitudinal axis. A dielectric block may be coupled to a distal end of the waveguide and a sub-reflector coupled to a distal end of the dielectric block. A shield is coupled to the periphery of the dish reflector. A subtended angle between the longitudinal axis and a line between the focal point and a distal periphery of the shield is 50 degrees or less.

An apparatus and method for automatically tuning a resonant circuit in a chiroptical measurement system. A sample cell holds a sample being measured for a chiroptical property as the sample is modulated by the resonant circuit. A signal source coupled to the resonant circuit generates a driving signal at one of a plurality of frequencies to modulate the resonant circuit. The frequencies are within a range of expected resonant frequencies for the resonant circuit. A feedback loop circuit coupled to the signal source is used to adjust the frequency of the driving signal to another of the frequencies in response to a feedback signal associated with a measured parameter of the driving signal. In this way, the frequency of the driving signal is adjusted to create a resonant condition. The driving signal may also be applied at a reduced power level so that the resonant circuit can be driven at off-resonant frequencies within the range of frequencies.

A printed circuit board is disclosed. A top layer power supply pattern and a top layer ground pattern are formed. The top layer power supply pattern and the top layer ground pattern are connected to a power supply layer and a ground layer through a plurality of viaholes, respectively. A plurality of capacitors or a plurality of capacitor resistor series circuits are disposed at predetermined intervals between the top layer power supply pattern and the top layer ground pattern.

A modular broadband transmission system and method include an input signal connector that receives an input signal which is then divided into N parts and amplified with an amplifier have N power amplifier modules. Outputs of the N power amplifier modules are passed through transmission lines and to a radial combiner that combines the outputs. The radial combiner, transmission lines and power amplifier modules are configured such that if one of the power amplifier modules fails, the other power amplifier modules may still operate acceptable well, with minimal impact on total output power. An output of the amplifier is provided to a coupler that measures a power level of the output signal and feeds the measured power level back to a controller where the controller adjust an overall output power based on the number of the power amplifier modules that are functioning properly. Each of the power amplifier modules have a processor such that respective of the power amplifier modules may be taken off-line, and replaced while the other power amplifier modules continue to operate in a transmit mode of operation. The modular broadband transmission system and method may conveniently be used as either a broadband booster for amplifying a plurality of input signals, or a head and transmitter configured to amplify one or more different input signals.

This disclosure provides systems, methods and apparatus for a display device with at least one transparent antenna. In one aspect, a transparent antenna is formed on the surface of a transparent substrate and is cooperatively coupled with a second antenna. The transparent antenna can avoid substantial interference with images produced by the display device.

One-dimensional, two-dimensional and three-dimensional negative refractive index (NRI) and / or opto-magnetic materials operating in spectral ranges spanning from the visible to far IR wavelength ranges is disclosed. Said materials are comprised of metal or metal / dielectric wire pairs arranged in a number of sublattices (one for one dimensional material, two for two-dimensional and three or more for three dimensional material), such that in each lattice, said wire pairs are essentially parallel to each other. Such a materials are useful and practical in obtaining previously unachievable important optical functions in these spectral ranges. Such optical properties are highly desired for many applications. A practical means of manufacture that is compatible with cost-effective and large-scale production methods is also provided.

A compact, agile polarization diversity, multiple frequency band antenna with integrated electronics for terrestrial terminal use in satellite communications systems is disclosed. The antenna includes an antenna feed having highly integrated microwave electronics that are mechanically and electromagnetically coupled thereto in a distributed arrangement so that diverse polarization senses having a low axial ratio and electronic switching control of the polarization senses is provided. The arrangement of the integrated distributed transceiver configuration enables the mechanical rotation of the orientation of a first transceiver for skew alignment while a second transceiver remains stationary relative to the antenna feed assembly. The first transceiver can be a high-band transmitter and receiver pair that supports linear polarization senses and the second transceiver can be a low-band transmitter and receiver pair that supports circular polarization senses. The antenna system presented is highly compact and offers improved polarization performance previously achievable by only larger devices.