163 results about "Antenna tuner" patented technology

The present invention concerns a wireless emergency alarm notification system for detecting a signal produced by a pre-existing smoke detector in a structure and for notifying persons in the immediate vicinity of a structure and in the surrounding area, as well as emergency personnel, of an emergency situation. The system includes a wireless sensor unit positioned nearby to a smoke detector for detecting an audible signal produced by the smoke detector in an emergency situation and a wireless receiver unit positioned on the exterior of the structure for receiving sensor signals from the sensor unit and activating an audible alarm and/or visible indicators. The sensor unit is comprised of a microphone for detecting a signal from the smoke detector, a control unit for determining the quality and/or quantity of the pre-existing smoke detector audible signal, a transmitter for transmitting an FM signal to a receiver, and a independent power source such as a battery. The receiver unit is comprised of an antenna, a FM tuner, FM receiver, power source, and a control unit for generating audible and/or visible alarms. In larger structures there may be numerous smoke detection systems each preferably having both a sensor unit and a receiver unit.

A method, transceiver integrated circuit (IC), and communications device for generating antenna tuning states derived from a pre-established trajectory of tuning states to adjust a detected signal level towards a preset, given value. A tuning state generation (TSG) controller determines whether a detected signal level matches a given value. If the detected signal level does not match the given value, the TSG controller selects an initial preset tuning state from a pre-established trajectory corresponding to a pre-identified operating condition that best matches a current operating condition. The TSG logic forwards the initial preset tuning state to the antenna tuner to trigger impedance transformation. Following generation of the initial preset tuning state, the controller receives an updated detected signal level. If the updated detected signal level fails to match the given value, the controller generates an incremental tuning state that is interpolated between the initial and a final preset tuning states.

The invention discloses an intelligent campus security management system capable of realizing functions of user management, automatic identity recognition, GPS (global position system) application, on-campus consumption, student information management and the like based on the internet of things according to a basic idea of effective integration of various functions of intelligent security campus and convenience of user. The system is composed of related software and a hardware device, wherein the related software comprises application software and embedded software for acquiring, recognizing, processing and transmitting the information; the hardware device is composed of an emitting antenna, a receiving antenna, an antenna tuner, a reader and a radio frequency card and is used for acquiring and recognizing the information, thereby realizing the predetermined system function and information management target.

The invention relates to a method for rapidly tuning impedance matching of an antenna tuner. An initial impedance value of matching turning is provided through impedance detection; an optimized threshold value of a matching network is provided through standing-wave ratio detection, and the matching conditions of a circuit are balanced; the matching network is an n-type matching network, a front n capacitor C1 and an inductor L are formed through binary cell arrays, and a fixed value is adopted to a back n capacitor C2; a binary cell array circuit is characterized by 1 being formed by connecting a plurality of branches in parallel, wherein each branch is formed by connecting a switch and a capacitor C in series; 2 being formed by connecting branches in series, wherein each branch is formed by connecting a switch and an inductor L. The method includes the steps of detecting the initial impedance, judging whether the capacitor C2 is connected or not, conducting impedance detection again, calculating the value of the inductor L and the value of the capacitor C1, and judging increased or decreased stepping magnitude according to the impedance deviation degree and the turning frequency band. The method has the advantages of being capable of achieving rapid matching of the input impedance of an antenna, fast in adjusting speed, simple in operation and capable of ensuring the turning speed .

Embodiments operate to reduce impedance mismatch between the PA and the antenna in a transceiver, thereby reducing the VSWR at the PA output and improving both the delivered power to the antenna and receiver sensitivity. In embodiments, an antenna tuner is placed between the PA and the antenna. The antenna tuner includes programmable components that can be tuned in order to effect an impedance translation between the antenna and the PA output, thereby reducing reflections seen by the PA. In an embodiment, the antenna tuner is adapted dynamically based on changes in the impedance of the antenna. Accordingly, the PA is operated very close to its optimal load impedance. In another embodiment, the antenna tuner is controlled based on measurement of the voltage reflection coefficient S11.

Provided is a variable shortwave antenna tuner matching network structure circuit. A set of series inductor is connected with a radio frequency antenna, the two ends of the series inductor are connected with a set of first grounding capacitor and a set of second grounding capacitor in parallel respectively, switches controlled by a relay are connected on the first capacitor and the second capacitor in series, and a short circuit switch controlled by the relay is also connected on the inductor in parallel. The second grounding capacitor connected with the radio frequency antenna is selected to be in grounding connection through a switching switch or to be directly connected with the radio frequency antenna through a wire. The radio frequency antenna is also connected with a switching switch which is used for selecting the connecting positions of the series inductor and the parallel grounding capacitors or being connected with the second grounding capacitor which is directly connected with the radio frequency antenna through the wire. When the circuit is in parallel connection, the circuit can be used as the auxiliary network of an LC network structure, and when the circuit is in series connection, the circuit can be used as the main network of a CC network structure. The circuit is flexible in use, strong in adaption capacity and small in power loss.

Adaptive self-tunable antenna systems and methods are provided including a closed-loop system for sensing near-field RF signals of transmitted RF signals and tuning an antenna or switching between multiple antennas, so that the strength of the transmitted RF signals is maximized. A sensing antenna detects the near-field RF signal, which is filtered and converted to an RF strength control signal that can be used to generate an antenna tuning control signal. An antenna tuner uses the antenna tuning control signal to keep the antenna in resonance by dynamically changing the electrical length of the antenna or switching between multiple antennas to maximize the strength of the radiated RF signal. Such antennas may be less prone to detuning due to interaction with human bodies or other objects. Dynamically matching the antennas to an RF power amplifier and low noise amplifier can improve stability, power efficiency, gain, noise figure, and receiver sensitivity.

The invention discloses a radio frequency transmitting circuit, comprising a radio frequency transmitter, an antenna switch and an antenna. A bidirectional coupler and an antenna tuner are arranged between the antenna switch and the antenna. The bidirectional coupler comprises a directional coupler and a switch, and forward or reverse transmission power is detected by switching the switch. The directional coupler is provided with a plurality of connected coupling lines, which are respectively located at any one or more positions of the upper side, the lower side, the outer side and the inner side of a main signal line. The bidirectional coupler is both used for detecting the transmitting power and is used for detecting the reflected power and outputting a detection value to the radio frequency transmitter. The radio frequency transmitter is both used for calibrating the transmitting power and is used for adjusting the input impedance of the antenna to realize the impedance matching of the antenna. The invention further discloses a bidirectional coupler, which has the advantages of simple structure, small volume, low cost, and easy integration with the manufacturing process of integrated circuits. The invention further discloses a directional coupler, which has high coupling degree and low insertion loss.

The invention provides an antenna circuit, a control method and a device of a mobile terminal. The antenna circuit comprises at least two antennas, wherein, each antenna is respectively connected withan antenna tuner; a radio frequency circuit electrically connected to a first antenna of the at least two antennas; a power detection module connected with a radio frequency circuit; a receiving path, wherein each of the at least two antennas other than the first antenna is connected to the receiving path through a switching switch, and each switching switch is connected to a power detection module; a controller respectively connected with the power detection module and the antenna tuner. Therefore, the scheme of the invention solves the problem that the isolation between the multiple antennas is too low and the antenna efficiency is poor.

An ‘L’ shaped dynamically configurable impedance matching circuit is presented herein. The circuit can include a series element and a shunt element. The shunt element in the L-shaped impedance matching circuit can be moved or modified based on the impedance of the circuit elements in electrical communication with each side of the impedance matching circuit. Thus, in some cases, the impedance matching circuit may be a flexible circuit that can be dynamically modified based on the environment or configuration of the wireless device that includes the impedance matching circuit.

The invention relates to a tunable antenna installed inside a mobile communication terminal to process multiple bands according to selection of reception frequency of a signal, and a control unit therefor. The tunable antenna includes an antenna for processing at least two different RF signals and an RF processor for receiving the RF signal from the antenna through a data signal line to convert the signal to a baseband signal. The tunable antenna further includes an antenna controller for providing a direct-current control signal for converting a band processed by the antenna through the data signal line, and an antenna tuner for receiving the direct-current control signal to convert the band processed by the antenna.

An automatic antenna tuner system for radio frequency identification system includes a pulse width modulator, a microprocessor for controlling the generation of a source signal from the modulator, capacitors for receiving the source signal from amplifiers and transmitting it to an inductor, a gate communicating with the capacitors for transmitting a resonating signal from the inductor and capacitors as a carrier signal and means for gating the carrier signal with the source signal to produce a compared signal to produce a string of pulses and means for varying capacitance to increase or decrease the count of the string of pulses.

A method, antenna switching integrated circuit (IC), and communications device that connect a transmitter to a selected antenna to propagate at least one transmission signal to the selected one of at least two antennas, based on feedback information associated with one or more antennas. An antenna tuning and switching (ATS) controller receives feedback information about a current status of an antenna tuner, wherein the current status of the antenna tuner is either locked or unlocked. In response to the current status of the antenna tuner being in a locked state, the ATS controller triggers an antenna selection switch to connect the antenna (that is associated with the antenna tuner) to the transmitter in order to propagate the transmission signal(s) from the transmitter to the antenna. If the antenna tuner is in an unlocked state, the ATS controller selects a different antenna that is not associated with an antenna tuner.

A method and system performs antenna tuning which enhances radio frequency (RF) tuner reliability within a wireless communication device (WCD). The WCD, in response to receiving a request to change an active RF tuning state, retrieves component usage data corresponding to components of a tuning circuit that is tunable to an RF operating channel. The WCD selectively determines, using device environment state data and/or RF state data and the component usage data, an RF tuning state tuned to the RF operating channel. The selected RF tuning state (a) satisfies tuning performance specifications and (b) enhances component reliability performance by minimizing an operational wear on tuning circuit components. The WCD configures the tuning circuit using the selected RF tuning state and tracks session parameter values for tuning circuit components during a corresponding communication session. Following completion of the communication session, the WCD uses the tracked session parameter values to update component usage data.

A video encoding device capable of recording a plurality of videos at the same time is provided. It is a device capable of performing simultaneous compression encoding and recording of programs of at least one or more channels selected by using, for example, a video encoding method such as an MPEG-2 format, comprises an antenna, a tuner unit, a synchronizing signal generating unit, a recording channel control unit, a multichannel encoder, a recording unit, a monitor, a loudspeaker, a GUI and an overall control unit, and controls the recording channel control unit so that the encoding processing by the multichannel encoder is decreased.

Disclosed herein are various examples of architectures, circuits, devices and methods that provide a simplex architecture so that an antenna serves only transmission or reception signals but not both at the same time. The architecture can include transmit and receive ports that can be dynamically coupled to first and second antenna ports to provide a transmit path and a receive path. The disclosed systems can include a controller configured to provide an antenna select signal to the architecture to control operation of the paths between the signal ports and the antenna ports. The architecture can include antenna tuners associated with individual antennas, the antenna tuners being separately controllable by the controller. The architecture can dynamically switch between a simplex configuration and a configuration that uses a single antenna for transmit and receive operations.

Methods, systems, and devices are described for wireless communication at a UE. The UE may communicate using a shared antenna communicatively coupled with a first radio and a second radio. When the UE identifies an upcoming transition to a sleep mode for the first radio, a tune code for the shared antenna may be adjusted for the second radio. A tune code query may be transmitted to the second radio which may respond with a tune code response. Adjusting the tune code may be based on the tune code response. This allows the second radio to communicate using the shared antenna while the first radio is in the sleep mode. When the UE identifies a transition from the sleep mode for the first radio, the UE may adjust the tune code for the shared antenna for the first radio, allowing the first radio to communicate using the shared antenna.

Disclosed are an antenna tuner and a method for adjusting antenna impedance. The antenna tuner includes a reference impedance resistor, a first coupler having an isolated port connected to one end of the reference impedance resistor, a second coupler having an input port connected to an output port of the first coupler and an output port connected to the antenna, and an impedance adjusting device group connected to the second coupler to adjust impedance of the antenna. An impedance controller generates an impedance adjustment control signal according to a first voltage applied to a coupled port of the first coupler, and a second voltage applied to a coupled port of the second coupler to provide the impedance adjustment control signal to the impedance adjusting device group.

The invention relates to a short wave antenna tuner insertion loss measuring device and method. The device comprises an actual transmitter emission and test unit, a signal source and a power amplifier emission and test unit. The method includes the steps that: the actual transmitter emission and test unit is connected, an output power of a transmitter is monitored through a through type power meter, a short wave transmitter emits signals in a frequency point f1 in the constant amplitude, and a through power P1 displayed by the through type power meter and a voltage V1 received by a short wave receiving antenna in the f1 frequency point are recorded; the signal source and the power amplifier emission and test unit are connected, a work frequency point of the signal source is set as f1, and the signal source is set as continuous wave emission, and a through power P2 displayed by the through type power meter and a voltage V2 received by the short wave receiving antenna in the f1 frequency point are obtained; and an insertion loss IL of an antenna tuner in the work frequency point is calculated. According to the invention, the antenna insertion loss is obtained by conversion of an actual antenna emission power value and a receiving value of the receiving antenna when two different emission sources are adopted for emission. The short wave antenna tuner insertion los measuring device and method can be extensionally applied to a scaled model electromagnetic compatibility test, and the measuring precision is improved.

The present disclosure relates to an antenna adjusting method and device. The method may comprise the following steps: determining a working frequency band of an antenna of a mobile terminal; determining a connection state between the mobile terminal and an external device; determining, based on the determined working frequency band of the antenna and the determined connection state, a target matching state of an antenna tuner in a pre-configured matching state corresponding relationship, wherein the matching state corresponding relationship comprises the corresponding relationship among eachworking frequency band of the antenna, each connection state between the mobile terminal and the external device, and each matching state of the antenna tuner; and adjusting the resonant frequency ofthe antenna based on the determined target matching state of the antenna tuner. According to the method and the device provided by the present disclosure, the target matching state of the antenna tuner is determined in the pre-configured matching state corresponding relationship based on the working frequency band of the mobile terminal and the connection state between the mobile terminal and theexternal device, and the mobile phone antenna can be adjusted to the optimized resonant frequency via the antenna tuner.

The invention provides circuitry integrated into a silicon chip that measures aspects of an RF signal on a transmission line in order to provide data that is ultimately used by an antenna tuner circuit to substantially match the impedance of the antenna with that of the transmission line providing the RF frequency to be transmitted.

A novel and useful adaptive antenna tuner and associated calibration mechanism for passive adaptive antenna matching networks. The tuner is suitable for use with cellular antennas and in one embodiment uses MEMS based tunable devices. The tuner contains voltage and current sensors inserted before the antenna matching network. The sensed complex impedance generates one or more update control signals for the tuning algorithm which drives the MEMS-based tunable devices.