Abstract: A frequency source, such as for a wireless communications device, configured to have a duty cycle adjustment. A selected harmonic spur resulting from operation of the frequency source at one duty cycle may be avoided or minimized by operating the frequency source at a second duty cycle. Determination of the appropriate duty cycle may be based on measuring the amplitude of the harmonic spur as it appears in the output of a receive chain of the wireless device. Alternatively, the duty cycle may be set to desired value to avoid or minimize a given harmonic.

Abstract: In embodiments of variable antenna match linearity, a wireless device includes a first transceiver and a second transceiver, an antenna via which signals are received, and a linearity controller that varies a linearity of an antenna match circuit associated with the antenna. The linearity controller can determine whether a frequency of an intermodulated signal that includes transmissions from the first and second transceivers is within one of a respective receive band of the first transceiver or the second transceiver. The linearity controller can increase a linearity of the antenna match circuit to mitigate an amplitude of the intermodulated signal in the receive band.

Abstract: A method and apparatus provide a wireless communication device multiband tunable radio architecture. The apparatus can include a multiband transceiver configured to transmit and receive wireless communication signals. The apparatus can include a tunable transmit notch filter coupled to the multiband transceiver. The tunable transmit notch filter can provide low insertion loss in a transmit band and attenuation at a receive frequency. The apparatus can include a tunable circulator coupled to the tunable transmit notch filter. The tunable circulator can provide transmit to receive isolation. The apparatus can include a tunable receive filter coupled to the multiband transceiver. The tunable receive filter can provide low insertion loss at a receive frequency and attenuation at other frequencies.

Abstract: Real-time calibration of a tunable matching network that matches the dynamic impedance of an antenna in a radio frequency receiver system. The radio frequency receiver system includes two non-linear equations that may be solved to determine the reflection coefficient of the antenna. The tunable matching network is repeatedly perturbed and the power received by the antenna is measured after each perturbation at the same node in the matching network. The measured power values are used by an optimizer in converging to a solution that provides the reflection coefficient of the antenna. The reflection coefficient of the antenna may be used to determine the input impedance of the antenna. The elements of the matching circuit are then adjusted to match the input impedance of the antenna.

Abstract: There is provided a communication apparatus including a voltage detection unit for detecting an antenna end voltage of a reader or a non-contact type IC card when non-contact communicating using a load modulation of the non-contact type IC card with respect to a magnetic field signal from the reader/writer; and a characteristics control unit for changing characteristics of the antenna of the reader/writer or the non-contact type IC card when the antenna end voltage detected by the voltage detection unit reaches a predetermined first threshold value.

Abstract: A method for tuning an antenna comprising determining an operating frequency band of the antenna, and adjusting a capacitance of a tunable load according to the operating frequency band, wherein the tunable load is electromagnetically coupled to the antenna via a parasitic arm, and wherein the operating frequency band depends on the capacitance.

Abstract: A system that incorporates teachings of the present disclosure may include, for example, a non-transitory computer-readable storage medium, which can include computer instructions to determine a subset of use cases from a group of use cases stored in a memory of a communication device, and to determine a target use case from among the subset of use cases based on an operational parameter associated with a transceiver of the communication device. Additional embodiments are disclosed.

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

Abstract: A circuit includes an oscillation generation circuit, a distribution circuit, and a transceiver circuit. The oscillation generation circuit is configured to generate a first oscillation signal having a first frequency. The distribution circuit includes a voltage to current stage, a transmission portion and a current to voltage stage. The voltage to current stage is configured to receive the first oscillation signal, and convert the first oscillation signal into a current form. The transmission portion is configured to transmit the first oscillation signal in the current form. The current to voltage stage is configured to receive the first oscillation signal in the current form and generate a second oscillation signal having a sub-harmonic frequency of the first frequency, such as half of the first frequency. The transceiver circuit is configured to operate in a frequency band responsive to the second oscillation signal.

Abstract: An input device for switchable use between first and second computer systems. A controller of the input device can execute switching logic to direct a radio transceiver of the input device to switch an operating channel of the radio transceiver to a first channel monitored by the first computer system in response to a first event, and thereby, the input device can be utilized to insert data into the first computer system. The controller can execute switching logic to direct the radio transceiver to switch the operating channel to a second channel monitored by the second computer system in response to a second event, and thereby, the input device can be utilized to insert data into the second computer system.

Abstract: A wireless communication apparatus is provided that performs wireless communication using a specified wireless channel and forms part of an ad hoc wireless network. The device includes a recording portion that records country ID information and recording-time information in to a storage medium, where the recording-time information indicates the time at which the country ID information was recorded in to the storage medium, a time determination portion that uses the recording-time information to determine whether a predetermined time period has elapsed from the time at which the country ID information was recorded, and a channel setting portion that, when the predetermined time period has not elapsed from the time at which the country ID information was recorded in the storage medium, sets a wireless channel to a frequency channel that can be used in the country indicated by the country ID information recorded in the storage medium.

Abstract: Tunable radio front end systems and methods are disclosed in which the tunable radio front end includes a first tunable impedance matching network, a second tunable impedance matching network, a transmission signal path, and a reception signal path. The transmission signal path can include a first tunable filter in communication with the first tunable impedance matching network, a tunable power amplifier connected to the first tunable filter, and a radio transmitter connected to the tunable power amplifier. The reception signal path can include a second tunable filter in communication with the second tunable impedance matching network, a tunable low-noise amplifier connected to the second tunable filter, and a radio receiver connected to the tunable low-noise amplifier.

Abstract: A method comprises: disposing an on-board unit at a preset relative position with respect to a road-side unit; transmitting a signal by the road-side unit; receiving the signal by the on-board unit and detecting a strength of the received signal; calculating, by the on-board unit, a calculated strength of the received signal according to the detected strength of the received signal; storing the calculated strength of the received signal in a memory accessible by the on-board unit; using the stored calculated strength of the received signal to determine if payment of a toll should be made.

Abstract: A device system is provided, comprising: a stylus comprising a first antenna; a receptacle for the stylus; a second antenna; and, at least one antenna tuning circuit enabled to: perform RF (radio-frequency) matching with the first antenna when the stylus is present in the receptacle to at least one of transmit and receive data via the first antenna; and, perform RF matching with the second antenna when the stylus is not present in the receptacle to at least one of transmit and receive the data via the second antenna.

Abstract: A mobile device includes an antenna, an ESD (Electrostatic Discharge) protection component, a plurality of branches, and a switch. The antenna is configured to transmit and receive an RF (Radio Frequency) signal. The branches provide different inductances or different capacitances, and are respectively coupled to a ground voltage terminal. The switch is coupled through the ESD protection component to the antenna, and switches between the branches according to a control signal such that the antenna is capable of operating in a plurality of frequency intervals. The ESD protection component is configured to protect the switch from being damaged.

Abstract: A transmitting and receiving device includes: a transmission circuit that transmits a signal by FM-modulating a carrier wave of the signal; an FM demodulation circuit that generates a demodulation signal by FM-demodulating the received signal; and a first filter circuit that changes a pass-band for letting the received signal pass through according to the demodulation signal, wherein the transmitting and receiving device perform a power supply line communication through the power supply line in which a signal is transmitted and received among a plurality of the transmitting and receiving devices.

Abstract: 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.

Abstract: Embodiments are directed to a transceiver comprising a first section and a second section, and a controller configured to: receive an uplink reflected power measurement and a downlink power measurement at the same time, calculate an impedance associated with the first section based on the uplink power measurement and the downlink power measurement, and provide a tuning parameter to the second section to match an impedance of the second section with the impedance of the first section.

Abstract: A system that incorporates teachings of the present disclosure may include, for example, a non-transitory computer-readable storage medium, which can include computer instructions to determine a subset of use cases from a group of use cases stored in a memory of a communication device, and to determine a target use case from among the subset of use cases based on an operational parameter associated with a transceiver of the communication device. Additional embodiments are disclosed.

Abstract: The control of an antenna tuner for a portable electronic device includes closed loop tuning when sufficient transmit power is present. The closed loop tuning commences using a predetermined antenna tuner configuration for an operational band and device state. The closed loop tuning may be constrained by a tuning range associated with the predetermined antenna tuner configuration for the operational band and device state. Also, when transmit power is low or when a transceiver is in a receive only state, open loop tuning may be conducted by placing the antenna tuner in the predetermined (or default) configuration for the operational band and phone state.

Abstract: A wireless communication device uses operational parameters stored in a capabilities list to control operation of the device. The device may also provide auxiliary services, such as reception of broadcast television signals and location detection using network assisted GPS. When auxiliary services are selected, the cellular operation may cause interference with the auxiliary services. The wireless communication device includes a reduced set of capabilities to control operation of the wireless communication device when an auxiliary service is requested. The particular set of reduced capabilities may depend on the specific type of auxiliary service that has been requested. Upon termination of the auxiliary services, the full capabilities list may be restored and the operation of the wireless communication device is thereafter controlled by the full set of operational capabilities.

Abstract: Systems and methods are provided for adjusting a noise figure in a radio receiver. An example method includes receiving a radio frequency (RF) signal at a RF receiver section. The RF receiver section includes at least one RF receiver element. The RF receiver element is controllable by at least one tuning variable. The RF signal is processed to generate a processed analog signal, which is converted to a digital signal. The digital signal is used to determine a performance parameter. The at least one tuning variable of the at least one RF receiver element is controlled to adjust the noise figure based on the performance parameter. In another aspect of the invention, an example radio receiver is provided. The radio receiver includes a RF receiver section having at least one RF receiver element. A controller determines a performance parameter using the digital signal and controls the at least one tuning variable to adjust the noise figure based on the performance parameter.

Abstract: According to one embodiment, an antenna apparatus comprises a first antenna element, a first lumped constant element, a first lumped constant element, a switch and at least one second lumped constant element. The first antenna element comprises a forward part, a folded part and a backward part, the forward part includes a start point connected to a feeding point, and the backward part includes an end point connected to ground. The first lumped constant element is inserted in the backward part. The switch is configured to select a current path in accordance with a control signal. The at least one second lumped constant element is to be selectively connected in parallel to the first lumped constant element through the switch.

Abstract: An adaptive antenna system for mobile applications where the mode of the antenna is optimized dynamically to optimize link quality with intended sources. Interfering signals are suppressed by mode selection to minimize link quality by altering antenna radiation pattern characteristics. A single driven antenna is configured such that the radiating mode can be dynamically adjusted and optimized based on link metrics.

Abstract: The present disclosure relates to a multi-band RF power amplifier (PA) module, which is used to receive, filter, and amplify a first RF input signal to provide a first RF output signal using a first tunable bandpass and notch filter. The multi-band RF PA module may include a supporting substrate having at least a first inductive element that provides a first portion of the first tunable bandpass and notch filter. Further, the multi-band RF PA module may include at least a first semiconductor die, which is attached to the supporting substrate and provides a second portion of the first tunable bandpass and notch filter. A transceiver module may provide the first RF input signal.

Abstract: A radio circuit includes an adjustable RF front-end module on an IC die, a liquid MEMS component on a board, and a processing module on the IC die. The adjustable RF front-end module adjusts processing of an inbound or an outbound RF signal based on a compensation control signal. The liquid MEMS component changes an operational characteristic as temperature of the radio circuit varies. The processing module generates the compensation signal based on the changing of the operational characteristic of the liquid MEMS component. The liquid MEMS component includes a channel within the board, a liquid droplet contained within the channel, and one or more conductive elements proximal to the channel.

Abstract: A method of performing a service scan for available channels across a bandwidth of an input signal, the method comprising the steps of: acquiring a power spectrum of the input signal bandwidth; analyzing the power spectrum to identify a list of candidate channels, each candidate channel being identified by at least a center frequency; processing each of the candidate channels in a receiver unit to extract service information, if present, relating to the candidate channel; and storing the service information for the channel in a memory.

Abstract: A plug-and-play antenna may be used with many different types of wireless communication devices. An antenna may be coupled to an impedance tuning component and a waveform generator. A calibration control module receives radio status information, controls the waveform generator to vary a response of the antenna, and tunes the impedance tuning component to match impedances between a radio and the antenna.

Abstract: According to an embodiment, a chip card communication arrangement is provided comprising a matching network and a chip card communication circuit comprising at least one matching network terminal, a receiver coupled to the matching network via the at least one matching network terminal and an active transmitter coupled to the matching network via the at least one matching network terminal.

Abstract: A filtering circuit with BAW type acoustic resonators having at least a first quadripole and a second quadripole connected in cascade, each quadripole having a branch series with a first acoustic resonator of type BAW and a branch parallel with each branch having an acoustic resonator of type BAW, the first acoustic resonator having a frequency of resonance series approximately equal to the frequency of parallel resonance of the second acoustic resonator, the branch parallel of the first quadripole having a first capacitance connected in series with the second resonator and, in parallel with the capacitance, a first switching transistor to short circuit the capacitance.

Abstract: Some embodiments of the present disclosure relate to a feedback receiver comprising a threshold comparator configured to determine if the amplitude of a baseband signal is within a selection corridor (e.g., defined by an upper and lower threshold value). If the amplitude is within the selection corridor, a feedback receiver is configured to accumulate RF signal samples (e.g., amplitude and phase samples) over a time period. The accumulated RF signal samples, which correspond to substantially constant baseband amplitude values, are then averaged. The calculated averages are utilized for impedance measurements used tune an antenna tuner to limit impedance mismatch. By limiting RF amplitude and phase sample collection to associated baseband signals having an amplitude falling within the selection corridor, substantially equal average amplitudes and phases can be achieved over a relatively short measurement period (i.e., without the need for long measurement period).

Abstract: A mobile device including an antenna structure is provided. The antenna structure includes a main radiation element, a parasitical element, and a tunable element. The main radiation element has a feeding pin coupled to a signal source, wherein the feeding pin is substantially located at an end of the main radiation element. The parasitical element is close to the main radiation element, and has a parasitical pin which is substantially located at an end of the parasitical element. The tunable element includes a switch and a plurality of paths, wherein the switch selectively couples one of the paths to the parasitical pin in such a manner that the antenna structure operates in multiple bands.

Abstract: A wireless communication device includes a processing module, a receiver section, a transmitter section, and an antenna system. The processing module is operable to generate tuning information and configuration information of a given wireless communication protocol. The receiver section is configurable in accordance with the configuration information to convert an inbound radio frequency (RF) signal into an inbound symbol stream in accordance with the tuning information. The transmitter section is configurable in accordance with the configuration information to convert an outbound symbol stream into an outbound RF signal in accordance with the turning information. The antenna system is operable to provide an antenna structure in accordance with the configuration information to transceive the inbound and outbound RF signals.

Abstract: A system that incorporates teachings of the present disclosure may include, for example, a non-transitory computer-readable storage medium including computer instructions to obtain at least one operational parameter associated with a communication device and to adjust a steerable antenna of the communication device when the communication device does not satisfy an impedance threshold, where the satisfying of the impedance threshold is determined based on the at least one operational parameter. Additional embodiments are disclosed.

Abstract: The wireless transceiver includes: a liquid crystal display (LCD) which includes a display screen; an LCD control unit which controls the LCD to display a frequency distribution of a signal strength in a predetermined frequency range including an operating frequency on the display screen; a touch panel and a touch panel control unit which detect a manipulation of a user on the display screen; an operating frequency storage unit which stores reception frequency information corresponding to a reception frequency and transmission frequency information corresponding to a transmission frequency; and a control unit which updates the reception frequency information stored in the operating frequency storage unit or the transmission frequency information stored in the operating frequency storage unit based on information about a frequency corresponding to a manipulation location of the manipulation detected by the touch panel and the touch panel control unit.

Abstract: A high-frequency front-end circuit includes a first variable filter and a second variable filter. One end of each of the variable filters is connected to a common terminal. The other end of the first variable filter is connected to a transmission individual terminal and the other end of the second variable filter is connected to a reception individual terminal. At the time of transmission of a transmission signal, the impedance of the second variable filter is adjusted such that the impedance seen on the second variable filter side from a connection point between the variable filters is open. At the time of transmission of a reception signal, the impedance of the first variable filter is adjusted such that the impedance seen on the first variable filter side from a connection point between the variable filters is open.

Abstract: A method of directing a recipient of video content items employing a mobile device to at least one video content item of interest to the recipient comprises: storing a plurality of predetermined pattern identifiers and corresponding pattern data, the pattern identifiers and pattern data generated by reference to data predictive of recipient interest; detecting a predetermined pattern in at least one video content item by reference to the stored pattern data; and in response to the detection, transmitting an indication of the at least one video content item and the pattern identifier corresponding to the stored pattern data used to detect the predetermined pattern in the video content item to a plurality of mobile devices including the mobile device employed by the recipient, the indication directing the recipient to the video content item that is associated with the detected predetermined pattern that is of interest to the recipient.

Abstract: A system that incorporates teachings of the subject disclosure may include, for example, method for initiating a mode of operation of a communication device, measuring a signal to determine an adverse operational effect on the communication device, determining a tuning state from the signal to compensate for the adverse operational effect, tuning a circuit of the communication device having a variable reactance according to the tuning state, storing the tuning state in a memory of the communication device, and tuning the circuit according to the tuning state retrieved from the memory responsive to detecting a reoccurrence of the mode of operation of the communication device. Other embodiments are disclosed.

Abstract: A method and device for providing impedance tuning to compensate for capacitive loading effects on an antenna which are associated with conductive or physical components in close proximity to the antenna is provided. A dynamic impedance tuning (DIT) controller periodically receives information that indicates that one or more functions of a physical component and/or a particular device operating state are currently active. In response to one or more functions of the physical component being activated, the DIT controller configures the tunable impedance to a pre-set impedance level to compensate for capacitive loading effects on the antenna. In addition, the controller triggers a switch to connect the tunable impedance to the ground signal line to provide antenna tuning corresponding to the preset impedance level. The tunable impedance adjusts the terminal impedance of the ground signal line to minimize capacitive loading effects associated with the signal line.

Abstract: Systems and methods for a self-optimizing distributed antenna system are provided. In certain embodiments, a distributed antenna system comprises a host unit configured to control the operation of the distributed antenna system; and a plurality of remote units coupled to the host unit. In at least one embodiment, a remote unit in the plurality of remote antenna units comprises a scanning receiver configured to receive signals in a plurality of frequency bands; at least one transceiver configured to transmit and receive signals in a frequency band in the plurality of frequency bands; and a remote unit controller configured to control an uplink gain level of the at least one transceiver and tune the scanning receiver to a frequency band in the plurality of frequency bands.

Abstract: A system that incorporates teachings of the subject disclosure may include, for example, a controller that determines a radiated throughput for at least one of an uplink throughput or a downlink throughput of the communication device, reduces transmit power for the communication device responsive to the radiated throughput satisfying a throughput threshold, and tunes a matching network of the communication device responsive to the radiated throughput not satisfying the throughput threshold. Other embodiments are disclosed.

Abstract: A system that incorporates teachings of the present disclosure may include, for example, a tuning system for a communication device having an antenna where the tuning system includes at least one first tunable element connected with at least one radiating element of the antenna for tuning the antenna where the adjusting of the at least one first tunable element is based on a closed loop process, and a matching network having at least one second tunable element coupled at a feed point of the antenna for tuning the matching network based on an operational parameter of the communication device. Additional embodiments are disclosed.

Abstract: A time-variant antenna is disclosed that uses a switched capacitor array in silicon to improve the performance and integration options of the time-variant antenna. Parasitic effects of the interface between the on-board antenna and on-silicon switched capacitor array are considered and the antenna is tuned to compensate for these effects. The switched capacitor array provides high linearity, lower cost, and reduced size, relative to prior art antenna implementations.

Abstract: A system that incorporates teachings of the present disclosure can include, for example, determining from nodal voltages sampled at an input port of a matching network an impedance of a variable load coupled to an output port of the matching network, generating at least one control signal according to the nodal voltage, and tuning the matching network with the at least one control signal. Additional embodiments are disclosed.

Abstract: A system that incorporates teachings of the present disclosure can include, for example, determining at a port of a matching network reflection information from a signal sampled across at least one predetermined fixed-value reactance component, generating at least one control signal according to the reflection information, and tuning the matching network with the at least one control signal, where the matching network comprises one or more controllable variable reactive elements each with an independent control voltage. Additional embodiments are disclosed.

Abstract: 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.

Abstract: Numeric values “a” representing a respective order of transmission by a plurality of transmitting units, and a numeric value N representing the total number of transmitting units, are set for each of the transmitting units. At startup, a transmitting unit for which the value “a” representing the order of transmission of the unit has been set to 1 sets a trigger value to N and transmits information about the value “a” of the unit and detection information from a sensor, and, when the value N is detected from a received signal, transmits the value “a” of the unit and detection information. When a value of a?1 is detected from a received signal, the transmitting unit for which the value “a” representing the order of transmission of the unit has been set to other than 1 transmits the information of the value “a” of the unit and detection information.

Abstract: Techniques for controlling transmit power and adjusting an antenna tuning network of a wireless device are disclosed. In an exemplary design, an apparatus (e.g., a wireless device or a circuit module) includes a directional coupler and at least one detector. The directional coupler receives an input radio frequency (RF) signal at a first port, provides an output RF signal at a second port, and provides a coupled RF signal at a third port. The detector(s) receive at least one RF signal on at least one port of the directional coupler, measure the at least one RF signal, and provide measurements that are used to control the transmit power of the wireless device and adjust an antenna tuning network. For example, the measurements may be used to determine incident power, reflected power, delivered power, etc., which may be used to control the transmit power and/or adjust the antenna tuning network.

Abstract: Embodiments of systems and methods for the efficient implementation of tuners are generally described herein. Other embodiments may be described and claimed.

Abstract: A transceiver including a transceiver component with a first and second inputs and an output. The transceiver is configured to (i) receive an input signal having packets via the first input and (ii) generate output signals at the output based on the input signal. The transceiver further includes a first comparator configured to compare the output signals and generate a first comparison signal; a register configured to store the first comparison signal; a calibration circuit is configured to generate a current signal based on the first comparison signal to adjust a current in the transceiver component; and a signal generator is configured to generate a reference signal based on the current signal. The transceiver component is configured to (i) based on the current signal, adjust a performance parameter of the transceiver at times synchronized with the packets and (ii) generate the output signals based on the current signal and the reference signal.