2619 results about "Double frequency" patented technology

A multi-band planar antenna applicable as an internal antenna in small-sized mobile stations, and to a radio device including an antenna according to the invention. The basis is a conventional dual band PIFA with its feeding and shorting conductors and a non-conducting slot. The planar element (220) has a second slot (232) known as such, which starts at the edge of the planar element on the other side of the feeding conductor (221) and shorting conductor (211) than the above-mentioned slot (231). In addition the structure comprises a second shorting conductor (212) on the other side of the second slot, than the feeding conductor. The second slot acts as a radiator, which for instance broadens the upper band of a dual band antenna. The second shorting conductor facilitates a better matching of a multi-band antenna than in corresponding prior art antennas. The antenna is simple, and its manufacturing costs are relatively low.

A low-profile dual-band antenna includes a ground plane. An “E”-shaped metal plate is located a first distance from the ground plane and includes first and second outer extensions and an inner extension of the metal plate. A feed tab connects the inner extension and the ground plane. A shorting tab connects the inner extension and the ground plane. The low-profile dual-band antenna communicates first radio frequency (RF) signals in a first RF band and second RF signals in a second RF band. The first RF signals and the second RF signals are vertical polarized signals. The low-profile dual-band antenna produces a radiation pattern that is omnidirectional in the azimuth plane and vertically polarized in a horizontal plane when communicating the first RF signals and the second RF signals. The first RF band and the second RF band can be independently tuned.

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.

The antenna of said transmitter is a microstrip antenna. A rear edge of its patch is provided with a short circuit by means of which a quarter-wave primary resonance can be excited by a coplanar line formed by two coupling slots in an area. Separator slots separate said area from another area in which a secondary resonance can be established at twice the frequency of the primary resonance from a slotted line extending one slot of the coplanar line. The invention applies in particular to the production of a dual-mode mobile telephone to the GSM and DCS standards.

An apparatus of antenna with heat slug and its fabricating process are provided, in which the antenna with heat slug can be realized with a single sheet or double sheets of metal. A dual-band antenna module with a mask cover is taken as an example to realize the apparatus. Each single sheet of metal can be achieved by simply cutting and bending a metal plate. Thereby, it is a simple and low-cost fabricating process. In the known fabricating process of integrated circuit, the heat slug and the antenna can be combined in a module at the same step. Therefore, integrating the antenna with heat slug in a fabricating process needs not to develop a new process.

Disclosed are various embodiments of circuitry for coupling first and second transceivers of a dual band radio telephone to integral and external antennas. The circuitry uses impedance matching lengths of transmission lines and switches arranged to provide a minimum insertion loss. Also disclosed is an embodiment for use with a single band radio telephone, such as a digital TDMA radio telephone that either transmits or receives at any given time. Also disclosed is an antenna switching arrangement for a dual band phone that eliminates a requirement for duplexers.

An electronic device is disclosed which has a diversity type of antenna unit constituted by three antennas and comprises a dual-band wireless communication function. The antenna unit has two transmission-receiving antennas adapted to each of different frequency bands, and one receive-dedicated antenna.

A multiple mode feed horn is provided for transmitting and receiving signals. The feed horn includes a transverse electric throat section, a transverse electric profile section, and a transverse electric aperture section. The transverse electric profile section propagates a first transverse electric (TE) mode. The transverse electric aperture section propagates a second TE mode. The multiple mode feed horn prevents propagation of traverse magnetic modes from said throat section to said aperture section.

The present invention relates to the field of biomedical engineering and medical treatment of diseases and disorders. Methods, devices, and systems for in vivo treatment of cell proliferative disorders are provided. In embodiments, the methods comprise the delivery of high-frequency bursts of bipolar pulses to achieve the desired modality of cell death. More specifically, embodiments of the invention relate to a device and method for destroying aberrant cells, including tumor tissues, using high-frequency, bipolar electrical pulses having a burst width on the order of microseconds and duration of single polarity on the microsecond to nanosecond scale. In embodiments, the methods rely on conventional electroporation with adjuvant drugs or irreversible electroporation to cause cell death in treated tumors. The invention can be used to treat solid tumors, such as brain tumors.

A bistable nematic liquid crystal device cell (1) is provided with a surface alignment grating on at least one cell wall (3) and a surface treatment on the other wall (4). Such treatment may be a homeotropic alignment or a planar alignment with or without an alignment direction, and zero or a non zero pretilt. The surface profile on the monograting is asymmetric with its grove height to width selected to give approximately equal energy within nematic material (2) in its two allowed alignment arrangements. The monograting may be formed by a photolithographic process or by embossing of a plastics material. The cell (1) is switched by dc pulses coupling to a flexoelectric coefficient in the material (2), or by use of a two frequency addressing scheme and a suitable two frequency material. Polarizers (13,13') either side of the cell (1) distinguish between the two switched states. The cell walls (3,4) may be rigid or flexible, and are coated with electrode structures (6,7), e.g. in row and column format giving an x,y matrix of addressable pixels on the cell (1).

A cellular radio telecommunications system and method of operating the same is described which includes a first cellular radio telecommunications network for providing frequency division duplex radio transmissions over an air interface to one or more fixed or mobile terminals and a second cellular unidirectional radio telecommunications network which at least partly overlaps the first cellular radio telecommunications network for providing unidirectional simplex radio transmissions over an air interface to the one or more fixed or mobile terminals. At least one of access to the unidirectional second cellular network and handover of a communication supported by the unidirectional second cellular network is managed by the first cellular network. A special dedicated uplink channel may be provided in the first network for trasmitting uplink control and / or error messages of the second network.

In a mobile telephone apparatus corresponding to dual-band provided with an RF power module to operate in two kinds of different frequencies, a common harmonics control circuit is provided to the output circuit of such RF power module to realize higher efficiency in view of controlling respective harmonics power for both band frequencies. Moreover, a means for selectively setting the bias is also provided so that the maximum efficiency can be attained depending on the output power required with respective communication systems with the bias control signal output from the CPU of the control unit interlocking with selection of frequency of the mobile telephone apparatus body.

A high-frequency circuit for use in a dual-band wireless communications apparatus selectively using first and second frequency bands, comprising a diplexer connected to the output of a power amplifier for sending either one of transmission signals in the first and second frequency bands to an antenna, a coupler having a primary line connected to a common end of the diplexer and a secondary line, a detector comprising a detection diode for detecting a transmission power of a high-frequency signal sent from the secondary line of the coupler, and a harmonics-suppressing circuit disposed between the secondary line of the coupler and the detection diode.

The present invention discloses an architecture for a concurrent dual-band high-frequency receiver. The invention combines a concurrent dual-band front-end subsystem having a dual-band antenna, dual-band pre-amplifier filter and concurrent dual-band LNA with a novel image rejection downconverter to provide the functions of a typical receiver, including reception, amplification and downconversion of a signal in two discrete desired frequency bands simultaneously.

An antenna with stacked resonant structures includes: a guide line for guiding electromagnetic waves formed in a conductive layer lying in a plane, and two resonant structures having different resonant frequencies, the two structures being formed on respective opposite sides of the plane so that both are coupled directly to the line and substantially decoupled from one another by the conductive layer. The guide line is preferably of the coplanar type and the two resonant structure are preferably of the quarter-wave type. The invention applies in particular to dual-band mobile telephones.

The invention relates to a dual-band inverted-F antenna with shorted parasitic elements. The antenna of the invention comprises a ground plane, a first radiating arm placed above an edge of the ground plane, a second radiating arm placed above the edge of the ground plane, a shorting arm with a substantially inverted-L shape for electrically connecting the first radiating arm and the second radiating arm to the ground plane, a shorted parasitic arm placed above the edge of the ground plane, and a feeding coaxial cable for transmitting signals. There is a distance between the shorted parasitic arm and the first radiating arm so as to induce extra capacitive reactance to compensate the inductive reactance induced by inserting the feeding coaxial cable. The present invention is suitable for the wireless local area network (WLAN) applications in the 2.4 GHz (2.4–2.484 GHz) and 5 GHz (5.15–5.35, 5.725–5.875 GHz) bands.

PCT No. PCT / JP97 / 02660 Sec. 371 Date Jan. 20, 1999 Sec. 102(e) Date Jan. 20, 1999 PCT Filed Jul. 31, 1997 PCT Pub. No. WO98 / 05120 PCT Pub. Date Feb. 5, 1998A dual-band multilayer bandpass filter having a first filter unit (18) for filtering a first signal having a first frequency and a second filter unit (19) for filtering a second signal having a second frequency. First and second filter units are arranged in stacked ceramic layers. A first blocking element (20a, 20b; 25a, 25b; 25a', 25b'; 46a, 46b) is coupled to the first filter unit (18) for blocking the second signal from being applied to the first filter unit (18). A second blocking element (21a, 21b; 26a, 26b; 25c, 25d; 27a, 27b) is coupled to the second filter unit (19) for blocking the first signal from being applied to the second filter unit (19).

The device according to the invention provides a non-contacting temperature sensing device incorporating micro-bolometric detectors as the suitable infrared sensors for automotive applications. A first and second infrared sensors each include an active infrared sensing element and a temperature drift compensating element. A current bias is applied to the active infrared sensing element as well as to the temperature drift compensating element, which is identical in structure with the active infrared sensing element, and the voltage outputs of these two elements pass through a differential amplifier. The fluctuation in the substrate temperature or the ambient temperature affects the active sensing element and the compensating element in the same way, thus it is cancelled out. Instead of using one spectral band of the infrared radiation, as in the prior art, two spectral bands are used resulting in a first and second signal generated by the first and second infrared sensors. A ratio of the first and second signals is obtained. The ratio of the signals is emissivity independent, so that the device of the present invention provides a more accurate measurement of temperature. The need to compensate for window contamination is also eliminated by this two band approach. The filtering elements for the two bands can be multi-layer thin film filters either coated on flat windows or on diffractive micro-lenses. The use of diffractive micro-lenses further reduces the size of the device, and eliminates the need for a separate optical lens.

A dielectric resonator antenna having a resonator formed from a dielectric material mounted on a ground plane with a conductive skirt. The ground plane is formed from a conductive material. First and second probes are electrically coupled to the resonator for providing first and second signals, respectively, to or receiving from the resonator. The first and second probes are spaced apart from each other. The first and second probes are formed of conductive strips that are electrically connected to the perimeter of the resonator and are substantially orthogonal with respect to the ground plane. A dual band antenna can be constructed by positioning and connecting two dielectric resonator antennas together. Each resonator in the dual band configuration resonates at a particular frequency, thereby providing dual band operation. The resonators can be positioned either side by side or vertically. Further advantage is obtained by mounting the dual antenna stack within a radome.

A Parasitic Element (202) for use in combination with a Planer Inverted “F” Antenna (PIFA) (100) that creates an additional band of efficient operation for the combined antenna structure (200). The parasitic element (202) is able to be made to conform to surfaces (704) that are near the PIFA, such as of a case (704) of a cellular telephone (706). The parasitic element (202) is positioned so as to radiantly couple with the PIFA (100) in order to create the additional band of efficient operation. A parasitic element (202) is used with a dual band PIFA that operates in two RF bands, such as in the region near 800 MHz and 1.9 GHz, and adds a third band such as in the region near 1.575 GHz to support reception of Global Positioning System signals. This parasitic element (202) can conform to a case (704) of the cellular telephone (706).

The invention discloses a tolling highway network traffic information acquisition and induction system based on a path identification system. The tolling highway network traffic information acquisition and induction system comprises a tolling highway outlet, inlet tolling lane system, a networking tolling center system, a 5.8G path identification station, a 5.8G path identification station monitoring system, a MTC vehicle double-frequency passing card, an ETC vehicle OBU and noncash payment card, an on-board multimedia terminal, and a traffic information processing system. The tolling highway network traffic information acquisition and induction system is advantageous in that by adopting the 5.8G Hz path identification station, the double-frequency passing card provided with the Bluetooth module, the OBU, and the on-board multimedia terminal, the path identification and traffic information acquisition and the traffic information push can be realized; by adopting the combination between the cloud calculation and the 5.8G path identification station distributed calculation, the processing and the prediction of the information such as the traveling time, the traffic flow, the travel speed, the traffic state, and the vehicle position of the tolling highway segment can be realized, and therefore the accurate and reliable front traffic information can be provided for the highway user.

A microstrip patch antenna is provided having a high gain performance with a smaller size compared to existing approaches. The antenna includes a patch having a polygon shape, such as a convex polygon, and a modified V-slot in the polygon patch including high-frequency control segments. Such an antenna has a dual band performance, such as in the Ka and Ku bands. An array of antenna elements is also described, as well as an ultra low profile phased array antenna system.

The invention discloses a double-frequency grating interferometer displacement measurement system. The system comprises a double-frequency laser device, an interferometer, a measuring grating and an electrical signal processing portion. The measurement system achieves displacement measurement based on optical grating diffraction, the optical doppler principle and an optical beat frequency principle. The double-frequency laser device transmits double-frequency laser, the laser is divided into reference light and measuring light through a polarizing beam splitter, the measuring light transmits into a position of the measuring grating, positive and negative first-order diffraction occurs, diffraction light and the reference light form a beat frequency signal which contains displacement information in two directions at the position of a light detection unit, and linear displacement output is achieved through signal processing. According to the system, the sub-nanometer-grade or even higher grade of resolution ratio and accuracy can be achieved, and horizontal large-stroke displacement and horizontal displacement can be measured at the same time. The system has the advantages of being insensitive to the environment, high in measuring accuracy, small in volume and light in weight. The system serves as a lithography machine ultraprecise workpiece platform position measurement system, the comprehensive performance of the workpiece platform can be improved.

The invention provides a watch antenna and an intelligent watch with GPS (global position system) and Bluetooth functions. The watch antenna comprises a PCB (printed circuit board), a connecting part and a metal edge frame, wherein the metal edge frame is used as an antenna radiation body, and is arranged around the PCB, a first gap is formed between the metal edge frame and the PCB, the metal edge frame is provided with an electric feeding part and a grounding part which are connected with the PCB through the first gap, a metal shielding layer of a display screen is suspended above the PCB, the metal shielding layer and the PCB are connected and grounded through the connecting part, a second gap is formed between the metal shielding layer of the display screen and the metal edge frame, and the metal shielding layer of the display screen and the connecting part form a parasitic part. The watch antenna has the advantages that the double-frequency resonance is generated by the gap between the metal edge frame and the PCB of the watch, and the intelligent watch with the GPS and Bluetooth functions is designed.

A dielectric-patch resonator antenna having a resonator formed from a dielectric material mounted on a ground plane with a conductive skirt, and a patch element disposed inbetween. The ground plane and patch are formed from conductive materials. First and second probes are electrically coupled to the resonator for providing first and second signals, respectively, to or receiving from the resonator. The first and second probes are spaced apart from each other. The first and second probes are formed of conductive strips that are electrically connected to the perimeter of the resonator and are substantially orthogonal with respect to the ground plane. A dual band antenna can be constructed by positioning and connecting two dielectric resonator antennas together. Each resonator in the dual band configuration resonates at a particular frequency, thereby providing dual band operation. The resonators can be positioned either side by side or vertically.

A dual band direct conversion architecture for both the receive (RX) and transmit (TX) path of a communications transceiver that minimizes the transceiver area by sharing common circuits used in both RX and TX paths is disclosed. The transceiver also allows the use of extensive digital calibration in order to achieve performance adequate to support high bit rate modulation schemes.

The invention relates to a device for measuring a frequency scanning absolute distance based on a femtosecond optical frequency comb and a method for measuring the absolute distance based on the device. The device comprises: a tunable laser (1), a polarization maintaining fiber system (2), a double-frequency heterodyne interferometer (3) and a system for measuring a laser frequency and an interferometric phase (4); the tunable laser (1) is used for generating single-frequency, single-line polarization laser, and an output laser frequency can be controlled by the working voltage and current ofthe tunable laser; the polarization maintaining fiber system (2) is used for coupling space laser with a polarization maintaining fiber in an unreflected way, and dividing the space laser into three paths of optical signals with equal optical intensity, and keeping an output laser polarization direction the same as an input laser polarization direction; the double-frequency heterodyne interferometer (3) is used for converting single-frequency laser into double-frequency orthogonal polarization laser, and converting distance information to be measured into phase information of a laser beat signal; and the system for measuring the laser frequency and the interferometric phase (4) is used for precisely measuring and locking and inputting the frequency of the laser, and measuring a phase different between the two paths of alternating current signals.

The invention relates to a dual-band inverted-F antenna with shorted parasitic elements. The antenna of the invention comprises a ground plane, a first radiating arm placed above an edge of the ground plane, a second radiating arm placed above the edge of the ground plane, a shorting arm with a substantially inverted-L shape for electrically connecting the first radiating arm and the second radiating arm to the ground plane, a shorted parasitic arm placed above the edge of the ground plane, and a feeding coaxial cable for transmitting signals. There is a distance between the shorted parasitic arm and the first radiating arm so as to induce extra capacitive reactance to compensate the inductive reactance induced by inserting the feeding coaxial cable. The present invention is suitable for the wireless local area network (WLAN) applications in the 2.4 GHz (2.4-2.484 GHz) and 5 GHz (5.15-5.35, 5.725-5.875 GHz) bands.

A digital dual-band detector functions as an imaging platform capable of extracting hard and soft tissue images, for example. The detector has a first detector system comprising a first scintillator for converting x-rays from a sample to an first optical signal, and a first detector for detecting the first optical signal in combination with a second detector system comprising a second scintillator for converting x-rays from the sample and passing through the first scintillator to a second optical signal, and a second detector for detecting the second optical signal. The detector can facilitate the implementation and deployment of recent developments and can permit low cost practical deployment in clinical applications as well as biomedical research applications where significant improvement in spatial resolution and image contrast is required.