2047 results about "Radio frequency circuits" patented technology

An embodiment of the present invention discloses a Wi-Fi device, including a radio frequency circuit, a signal processor, an application processor, and a Wi-Fi chip. The application processor is configured to preset the work mode of the Wi-Fi chip to a single input single output SISO mode, and is further configured to acquire a value of a parameter of an uplink wireless network, and when the value of the parameter of the uplink wireless network is determined to be greater than or equal to a preset value, set the work mode of the Wi-Fi chip to a multiple-input multiple-output MIMO mode. An embodiment of the present invention further discloses a method for setting a communications mode.

Provided is a secure digital memory card for extension of function, including: a flash memory installed in a host device and storing data generated by the host device; a controller controlling an access interface to the flash memory; a radio frequency circuit performing functions of a contactless integrated circuit card and a contactless integrated circuit card reader through a wireless interface control of the controller; an antenna unit connected to the radio frequency circuit to perform a function of a transmission and reception antenna; and a contact integrated circuit card adapter performing the function of the contact integrated circuit card reader through a wire interface control of the controller.

An unlicensed wireless communication base station includes a radio frequency circuit to transmit an unlicensed wireless communication base station identification signal to a subscriber device and to receive licensed wireless communication system security information from the subscriber device responding to the unlicensed wireless communication base station identification signal. A control circuit is connected to the radio frequency circuit. Network interface circuitry is connected to the control circuit. The control circuit conveys the licensed wireless communication system security information to the network interface circuitry for delivery to a network. The network interface circuitry receives from the network an authentication command that is delivered to the control circuit. The control circuit and the radio frequency circuit coordinate unlicensed wireless communication between the subscriber device and the unlicensed wireless communication base station in response to the authentication command.

A multi-part, distributed antenna arrangement including: an antenna element as a first part; and a semiconductor chip as a second part, separated from the first part, wherein the semiconductor chip comprises integrated radio frequency circuitry and a coupling element for wirelessly coupling the integrated radio frequency circuitry with the antenna element.

The invention relates to a method of regulating the power available at the manipulator of an electronic scalpel so as to make said manipulator adapted to be used to obtain blood clotting, said electronic scalpel being of the kind comprising: at least a mains voltage rectifying circuit supplying rectified and direct voltage to at least a radio frequency circuit adapted to emit as output a current carrier signal at a main frequency set by an oscillator, said current signal feeding said manipulator through a radio frequency transformer, wherein said method consists in applying to the manipulator a wave form resulting from the sum of the carrier wave and a modulating wave of such frequency that the energy transmitted to the tissue to be coagulated is such to raise the temperature of the tissue to be coagulated until denaturation of the fibrinogen contained therein is caused and transforming it into fibrin. The invention relates also to the electronic scalpel carrying out such a method

An electrical device configured to install within a wall mounted electrical box includes an antenna bezel frame, an antenna element, and a radio frequency circuitry component. At least a portion of the antenna bezel frame is configured to protrude through an opening in a faceplate. The antenna element is mounted to the antenna bezel frame such that the antenna element is located a distance forward of a plane that contains a front surface of the faceplate when the field configurable electrical device is installed. The radio frequency circuitry component is in electrical communication with the antenna element and is configured to receive a control signal from the antenna element.

Systems and methods are described for a GPS receiver capable of functioning in the presence of interference. A method includes detecting an interfering signal including: tuning a band pass filter over a frequency range; and at each of a plurality of incremental frequencies: computing a set of band pass filter coefficients; sending the set of band pass filter coefficients to a digital filter; repeatedly transforming an analog-to-digital converter output having a quantization level in excess of 2 bits into a band pass filter output with the digital filter to obtain a plurality of samples; computing an average of the plurality of samples; and comparing the average to a threshold to detect peaks that exceed a threshold. An apparatus, comprising: an analog radio frequency circuit; an analog-to-digital converter coupled to the analog radio frequency circuit, the analog-to-digital converter providing a quantization level in excess of 2 bits; a digital filter coupled to the analog-to-digital converter; and a digital circuit coupled to the digital filter.

One aspect of the invention relates to an implantable medical device comprising a device housing (100), at least one radio frequency circuit (104) for radio frequency communication, at least one antenna, at least one terminal to electromagnetically couple said at least one antenna to said at least one radio frequency circuit, and a dielectric compartment (101, 1661) that encompasses at least a portion of said at least one antenna. The antenna comprises a conducting pattern, at least a portion of which is shaped as a curve, wherein said curve comprises at least five segments, wherein each of said at least five segments forms an angle with each adjacent segment in said curve, wherein at least three of the at least five segments of said curve are shorter than one-fifth of the longest free-space operating wavelength of the antenna, wherein each angle between adjacent segments is less than 180°, and at least two of the angles between adjacent sections are less than approximately 115°.

An apparatus for communicating with a RFID tag comprises an antenna for communicating with a RFID circuit element by wireless communication, a signal processing circuit and a radio frequency circuit for accessing an IC circuit part of the RFID circuit element through the antenna based on an access instruction to information in a RFID tag, a storage device for storing at least correlation information of identification information of an object which is to bear a RFID tag containing the RFID circuit element to identification of the RFID circuit element corresponding thereto in a database, a control circuit for accessing the database based on an access instruction to a storage device, a tape feeding roller drive shaft for feeding out a cover film associated with the RFID circuit element, and a print head for printing a print based on a printing instruction.

A system and method for wirelessly communicating using beamswitching is provided. A communications system includes a high-power signal cable coupled to a signal amplifier, a radio frequency circuit coupled to the high-power signal cable, and a control unit coupled to the radio frequency circuit. The high-power signal cable conveys a transmission signal produced by the signal amplifier. The radio frequency circuit includes a plurality of antennas, a passive network having a plurality of output ports and a plurality of input ports, each output port coupled to an antenna of the plurality of antennas, and a plurality of switches coupled to the high-power signal cable, each switch coupled to an input port in the plurality of input ports. The control unit produces the control signal based on a specified coupling of the high-power signal cable to the passive network.

The invention discloses a nuclear magnetic resonance analyzer and a nuclear magnetic resonance measuring method. The analyzer comprises a radio frequency circuit, a magnet, a glass tube, a first coil and a second coil, wherein a sample to be measured is placed in the glass tube; the glass tube is fixedly arranged at a position opposite to the magnet and is placed in a magnetic field produced by the magnet; the first coil and the second coil are wound on the outer surface of the glass tube respectively and are connected with the radio frequency circuit; the first coil is placed at a uniform magnetic field produced by the magnet; and the second coil is placed at a gradient magnetic field produced by the magnet. Through the analyzer, distribution data of transverse relaxation time and longitudinal relaxation time of substances in the sample to be measured can be obtained, and distribution data of diffusion coefficients of the substances in the sample can be obtained.

The invention discloses a calibrating device for a time division duplexing MIMO multi-antenna communication system radio frequency circuit, a method for the same, and a transceiver of the calibrating device. The technical proposal is that: the device comprises: a calibration factor computation module which receives a downlink channel estimation matrix Hdown (k)' and an uplink channel estimation matrix Hup (k)' fed back from the other party, and calculates and outputs the calibration factors AAP (k) and AUE (k) according to Hup (k)'=AAP (k)x(Hdown (k)') <T>x(AUE (k)) -1, wherein the calibration factors AAP (k) and AUE (k) being both diagonal matrixes; a calibration factor memory module which receives and stores the two calibration factors AAP (k) and AUE (k); and a calibration receiving channel estimation matrix module which receives the downlink estimation matrix Hdown (k) requiring calibration, picks up the two calibration factors AAP (k) and AUE (k) from the calibration factor memory module, and works out and outputs a calibrated uplink estimation matrix Hup (k) according to Hup (k)=AAP (k)x(Hdown (k))<T>x(AUE (k)) -1. The invention is applicable to the wireless communication field.

An antenna system for remote control applications comprises a communications module; an antenna assembly; and a radio frequency cable, having a first connection end and a second connection end, wherein the first connection end is coupled to the communications module and the second connection end is coupled to the antenna assembly. The antenna assembly is located a predetermined distance from the communications module, the predetermined distance substantially eliminating null regions in an antenna radiation pattern of the antenna system. An antenna diversity system for remote control applications comprises an antenna assembly; a communications module; an electronic switch assembly, wherein a first RF cable couples the electronic switch assembly to the antenna assembly and a second RF cable couples the electronic switch assembly to the communications module, wherein the antenna assembly, the first RF cable, the second RF cable, the electronic switch assembly and the communications module form a radio frequency circuit; and a diversity RF cable, coupled to the electronic switch assembly, wherein the electronic switch assembly switches the diversity RF cable into and out of the radio frequency circuit.

The invention provides a radio frequency circuit and a terminal. The radio frequency circuit comprises an intelligent processing module connected to a transceiver for receiving emission signals sent by the transceiver, processing the received emission signals to obtain first detection signals and feeding the first detection signals back to the transceiver; the transceiver used for emitting the emission signals and detecting power values of the received first detection signals; and a processor connected to the transceiver for determining whether an emission pathway for transmitting the emission signals in the radio frequency circuit are abnormal according to the power values of the first detection signals, detected by the transceiver. According to the technical scheme, under the condition that a laboratory test environment is not additionally created, fault detection of the radio frequency circuit is realized, the fault analysis time is shortened, and the investment cost is decreased.

The invention provides a radio frequency circuit and a terminal for realizing carrier aggregation. The radio frequency circuit for realizing the carrier aggregation comprises a first antenna used for realizing power transmission and master set receiving of a signal of a first frequency band and a signal of a second frequency band; a second antenna used for receiving power transmission and receiving of a signal of a public frequency band, and realizing power transmission and master set receiving of a signal of a third frequency band and a signal of a fourth frequency band; a third antenna used for realizing diversity receiving of the signal of the first frequency band, the signal of the second frequency band, the signal of the third frequency band and the signal of the forth frequency band; and a transceiver, which is connected to the first antenna, the second antenna and the third antenna through a signal processing circuit, and is used for realizing the carrier aggregation of the first frequency band and the third frequency band, and the carrier aggregation of the second frequency band and the fourth frequency band. The radio frequency circuit and the terminal for realizing the carrier aggregation provided by the invention can realize the carrier aggregation on the premise of not increasing the quantity of existing terminal antennas, and can reduce the power consumption and cost when the terminal realizes the carrier aggregation.

The invention provides an antenna impedance matching device, a semi-conductor chip and an antenna impedance matching method. The device comprises the semi-conductor chip and at least one impedance device, wherein the semi-conductor chip comprises a plurality of adjustable capacitors and a plurality of switches; the impedance device is located outside the semi-conductor chip; the semi-conductor chip is coupled with the impedance device through a plurality of terminals and coupled with the input end and the output end of the antenna impedance matching device; the input end and the output end of the antenna impedance matching device are respectively coupled with a radio frequency circuit and an antenna; the switches are used for switching the connection between the adjustable capacitors and the impedance device under the control of a control signal; the values of the adjustable capacitors are adjusted by adjustment signals so as to tune the impedance matching of the antenna. The embodiment of the invention can improve the frequency coverage of antenna impedance tuning so as to flexibly tune impedance matching as required.

The invention discloses a method for designing a universal ultra wideband impedance matching network. A wideband matching network is added at the radio frequency input end or the radio frequency output end of a radio frequency circuit, and can be one of a T-type matching network, a Pi-type matching network and a hybrid matching network; elements in the matching network can be inductors or capacitors; the input reflection coefficient S11 or the output reflection coefficient S22 of the designed radio frequency circuit is shown in a Smith chart; an S11 curve or an S22 curve changes in the Smith chart by serially or parallelly connecting the inductors or the capacitors in the matching network; and the two curves finally completely fall into a -10dB impedance matching circle, so that the radio frequency circuit realizes impedance matching within an ultra wideband frequency band. An optimal ultra wideband impedance matching network can be conveniently designed by the method; and taking a low noise amplifier (LNA) as an example, for an optionally given LNA structure, an optimized matching network can be acquired by inserting one or more inductors or capacitors into an input and output matching network. In the process of designing the matching network, the positions of the reflection coefficient curves in the Smith chart are adjusted by adjusting the connecting mode and the sizes of the elements, and the reflection coefficient curves can move into reflection coefficient circles such as -10dB and the like in the range of an overall designing frequency band, so that the aim of accomplishing the good impedance matching in a wide frequency band range is fulfilled.

The invention relates to the technical field of radio, in particular to a method and equipment for searching for Bluetooth equipment rapidly. Bluetooth communication connection is built between a Bluetooth radio frequency circuit and the paired target Bluetooth equipment; Bluetooth communication signals are sent to the target Bluetooth equipment; a processor obtains a relative distance value of the equipment and the target Bluetooth equipment according to the intensity of the Bluetooth communication signals fed back by the target Bluetooth equipment; prompting equipment sends out corresponding prompting information according to the relative distance value. According to the rapid searching method and equipment, communication signals of the paired target Bluetooth equipment are received in real time, the relative distance between the equipment and the target Bluetooth equipment is identified according to the intensity of the communication signals, the higher the intensity of the communication signals is, the smaller the relative distance is, the sent promoting information is adjusted according to the relative distance, and the target Bluetooth equipment can be found out rapidly and accurately by people according to the prompting information, operation is simple, and power consumption is low.

The invention provides an antenna system and a mobile terminal. A low-outline antenna system which comprises a first resonance arm, a second resonance arm and a third resonance arm is divided on the metal back shell of the mobile terminal; a first radio frequency circuit and at least two tuning switches are arranged between the first resonance arm, which is positioned between the second resonance arm and the third resonance arm, and the grounding end; and by adjusting switch-on and switch-off of different tuning switches, the communication efficiency and bandwidth of communication frequency bands of the communication antenna formed by the first resonance arm can be adjusted.

The invention relates to a vertical coupled structure applied to a millimeter-wave microstrip antenna. The vertical coupled structure comprises microstrip patch antennae, a bottom-layer medium chip substrate, a substrate cavity forming structure, a grounding plate with a gap, a top-layer chip substrate and a coplanar waveguide adapter microstrip feeder line. The microstrip patch antennae are arranged on the bottom sides of the bottom-layer medium chip substrate and the top-layer chip substrate. The substrate cavity forming structure is formed by forming a cavity in the bottom-layer medium chip substrate. The coupling caliber of the gap is located between a bottom-layer medium chip and a top-layer chip. The coplanar waveguide adapter microstrip feeder line is arranged on the upper surface of the top-layer chip substrate. The interlayer vertical interconnection problem of the antenna and a radio-frequency circuit when working frequency is within a millimeter-wave frequency range can be solved by means of the vertical coupled structure. The vertical coupled structure has the advantages of being free of weld points and parasitic radiation and capable of obtaining an even radiation pattern, overcoming the adverse influence brought by a traditional single feed mode and design limitations and the like.

There is provided a radio frequency circuit device for multi-band and multi-mode which is low in a circuit loss, and a mobile communication terminal using the radio frequency circuit device. The radio frequency circuit device has a first path 110 that includes an amplifier 10a that amplifies signals of at least two modulation techniques in power, a matching network 20 that is connected to the amplifier and a duplexer 50 and allows the matching network to be coupled with an antenna, and a second path 111 that does not include the duplexer and allows the matching network to be coupled with the antenna. The first path is selected when the amplifier amplifies one of the signals of at least two modulation techniques, and the second path is selected when the amplifier amplifies another signal. An output impedance of the amplifier is matched with an impedance when viewing the antenna side from the amplifier in the first path and the second path.

The invention relates to a radio frequency circuit and electronic equipment, the radio frequency circuit comprises a first switch unit, a radio frequency transceiving module, a first diversity receiving module, a first antenna module, a second switch unit, a second diversity reception module and a second antenna module, and the first switch unit is provided with a first end and a second end; the radio frequency transceiving module is connected to the first end of the first switch unit and is used for transceiving a radio frequency signal; the first diversity receiving module is connected to the first end of the first switch unit and is used for receiving a first diversity signal; the first antenna module is connected to the second end of the first switch unit; the second switch unit is provided with a first end and a second end, and the first end of the second switch unit is connected with the second end of the first switch unit; the second diversity receiving module is connected to the first end of the second switch unit and is used for receiving the first diversity signal; and the second antenna module is connected to the second end of the second switch unit.

A system that incorporates teachings of the subject disclosure may include, for example, a method for detecting a plurality of use cases of a communication device, determining an initial tuning state for each of a plurality of tuning algorithms according to the plurality of use cases, configuring each of the plurality of tuning algorithms according to their respective initial tuning state, executing a first tuning algorithm of the plurality of tuning algorithms according to an order of execution of the plurality of tuning algorithms, detecting a stability condition of the first tuning algorithm, and executing a second tuning algorithm of the plurality of tuning algorithms responsive to the detected stability condition of the first tuning algorithm. Each tuning algorithms can control one of a tunable reactive element, a control interface, or both of one of a plurality of circuit components of a radio frequency circuit. Other embodiments are disclosed.

The present invention is directed to a circuit capable of matching variable impedances, and implements the variable impedance matching circuit by varying an electrical length of a transmission line by means of external control signals. In the L or pi type matching circuit using inductance and capacitance as lumped elements, the variable impedance matching circuit is implemented by changing impedance values of the variable inductance and variable capacitance as lumped elements which have been made to be controlled, or by changing a topology of a circuit network by external control signals. Therefore, the variable impedance matching circuit according to the present invention enables it possible to electrically control an impedance of interest from arbitrary impedances, thereby a radio frequency circuit to which the variable impedance matching circuit belongs can be controlled, and the matching circuit can be implemented with arbitrary complex loads from any RF signal sources.

There are included an antenna transmitting and receiving information through a radio communication with a RFID circuit element, a signal processing circuit and a transmission portion of a radio frequency circuit configured to execute write or read of information with respect to an IC circuit part of the RFID circuit element, a tape-feeding-roller drive shaft for feeding out a base tape from a first roll, a cutter configured to cut the base tape fed out by this tape-feeding-roller drive shaft to a predetermined length to produce a RFID label, a print head making a print in a predetermined print region of the base tape, and a control circuit configured to control this print head so as to be capable of being switched between the print in a forward direction and the print in a rotation direction inverting this forward direction with respect to a predetermined print region.

The invention discloses an antenna multiplexing radio frequency device and a terminal. The antenna multiplexing radio frequency device comprises a plurality of radio frequency antennas, a plurality ofwireless antennas, a radio frequency circuit and a gating module. The radio frequency circuit comprises a 4G radio frequency front end module, a 5G radio frequency front end module, a WiFi radio frequency front end module and a GPS radio frequency front end module. And part of the radio frequency antennas are connected with the 4G radio frequency front-end module and the 5G radio frequency front-end module through the gating module. All wireless antennas are connected with the WiFi radio frequency front-end module and the GPS radio frequency front-end module through the gating module. The embodiment of the invention discloses an antenna multiplexing radio frequency device. The 5G radio frequency front-end module and the 4G radio frequency front-end module can multiplex part of radio frequency antennas, and the WiFi radio frequency front-end module and the GPS radio frequency front-end module can multiplex all wireless antennas, so that the requirement of a multimode communication terminal on the number of antennas is reduced, and meanwhile, the cost and the design complexity of the terminal are reduced.

A system that incorporates teachings of the subject disclosure may include, for example, a method for detecting a plurality of use cases of a communication device, determining an initial tuning state for each of a plurality of tuning algorithms according to the plurality of use cases, configuring each of the plurality of tuning algorithms according to their respective initial tuning state, executing a first tuning algorithm of the plurality of tuning algorithms according to an order of execution of the plurality of tuning algorithms, detecting a stability condition of the first tuning algorithm, and executing a second tuning algorithm of the plurality of tuning algorithms responsive to the detected stability condition of the first tuning algorithm. Each tuning algorithms can control one of a tunable reactive element, a control interface, or both of one of a plurality of circuit components of a radio frequency circuit. Other embodiments are disclosed.

The invention discloses a radio frequency circuit of an LTE carrier wave polymerization technology and communication equipment thereof. The radio frequency circuit comprises at least one L*M switch, a combiner and a 1*N switch. When the L*M switch is in a carrier wave polymerization mode, switch logic of the L*M switch is selectively connected to a radio frequency path of the combiner. During non-carrier-wave polymerization mode work, through an L*M switch device and one 1*N switch, the combiner is bypassed so that performance in a non-carrier-wave polymerization work mode is guaranteed. In the invention, the radio frequency circuit of a new LTE carrier wave polymerization technology is adopted, circuit insertion losses of a communication terminal under the non-carrier-wave polymerization work mode are effectively reduced, simultaneously a large occupation space problem of a plurality of antenna circuits is avoided, and through flexibly applying the L*M switch device, the radio frequency circuit can satisfy more scene applications.

System and method for interfacing with a digital computer using a multi-function device. A preferred embodiment comprises a multi-function device comprising a controller configured to process information and regulate operations of the multi-function device, a sensor coupled to the controller, the sensor configured to capture information in a movement of the multi-function device or a movement of an object applied to the multi-function device and to provide the information to the controller, wherein the information is used to determine movement information. The multi-function device further comprises a radio frequency circuit also coupled to the controller, the radio frequency circuit is configured to exchange information with other devices via a plurality of communications networks, wherein one of the other devices is a computer and the information shared is movement information from the multi-function device.