6097 results about "Radio frequency signal" patented technology

An electrosurgical system comprises a generator and an instrument including a first electrode, a second electrode, and an insulating spacer separating the first and second electrodes. The generator repeatedly measures a characteristic of the radio frequency output such as the impedance between the first and second electrodes. The generator analyses the impedance measurements, and interrupts the radio frequency signal when the rate of change of the impedance is such as to indicate the onset of a “flare-out”. In this way, the power is reduced before the flare-out leads to permanent damage or failure of the instrument.

Sensor assembly capable of obtaining and providing a measurement of a physical quantity, e.g., measurement of temperature and/or pressure of a vehicular tire, includes an antenna capable of receiving a radio frequency signal, a radio frequency identification (RFID) device coupled to the antenna, a sensor coupled to the RFID device arranged to generate a measurement of the physical quantity or quantities, and a switch coupled to the RFID device and arranged to connect or disconnect the sensor from a circuit with the antenna dependent on whether the antenna receives a particular signal associated with the RFID device. When the antenna receives the particular signal associated with the RFID device, the RFID device causes the switch to close and connect the sensor in the circuit with the antenna to enable the measurement generated by the sensor to be directed to and transmitted by the antenna.

A cordless cautery and cutting surgical device includes a modular battery and a surgical handle operable to removably hold the battery thereto. The handle has a cordless radio-frequency-signal-generation assembly and a surgical bipolar end effector having jaws and a cutting blade therebetween. The signal-generation assembly selectively supplies radio-frequency signal to the end effector when powered for electrocautery of tissue between the jaws. The handle defines therein an aseptically sealable battery-holding compartment selectively exposed to the environment and removably holding therein the battery. A motor assembly is disposed in the handle and is electrically connected to the battery and/or the signal-generation assembly and is powered and controlled thereby. The motor assembly physically couples to the blade and/or at least one jaw for moving the blade/jaw(s). The second connector part electrically connects the battery to the signal-generation assembly and/or the motor assembly when the battery is removably disposed in the compartment.

A method of asset control and workstation computer deployment that utilizes a dual port electronic memory identification RFID tag to hold serial number and hardware and software configuration profiles as well as user information. The RFID tag is mapped into the workstation computer memory space and can also be read and written by radio frequency signalling through a wired plug and access flap in a shipping carton. Serial numbers and MAC address is stored on the tag by the manufacturer. User information, workstation profile and software image information is stored onto the tag while the computer is being received for forwarding to the final workstation destination without the need to unpack and power up the computer. The information stored on the tag is used to allow automated system configuration and software downloading to the computer.

A cardiac defibrillator includes a fibrillation detector, which determines when a medical patient requires defibrillation at which time a transmitter produces a radio frequency signal. A first stent electrode is implanted into a blood vessel at a first location in the medical patient and a second stent electrode is implanted into a blood vessel at a second location. The first stent electrode contains an electronic circuit that is electrically connected to the second stent electrode. In response to receiving the radio frequency signal, the electronic circuit uses energy from that signal to apply an electric defibrillation pulse between the first and second stent electrodes.

An abnormally rapid ventricular cardiac rate that results from atrial fibrillation can be reduced by stimulating a vagal nerve of the heart. An apparatus for such stimulation includes a power transmitter that emits a radio frequency signal. A stimulator, implanted in a blood vessel adjacent the vagal nerve, has a pair of electrodes and an electrical circuit thereon. The electrical circuit receives the radio frequency signal and derives an electrical voltage from the energy of that signal. The electrical voltage is applied in the form of pulses to the pair of electrodes, thereby stimulating the vagal nerve. The pattern of that stimulating pulses can be varied in response to characteristics of the atrial fibrillation or the ventricular contractions.

The system includes, at least first and second antennas receiving first and second radio frequency signals, and a multiplexing system converting the first and second radio frequency signals to first and second optical signals and multiplexing the first and second optical signals for transmission over the optical fiber. A central processing base station is adapted for connection to the optical fiber. The central processing base station demultiplexes the first and second optical signals from the optical fiber, converts the first and second optical signals into the first and second radio frequency signals, and processes the first and second radio frequency signals to obtain information signals. In another embodiment, a conductor such as a coaxial cable replaces the optical fiber, and the multiplexer multiplexes the first and second radio frequency signals onto the conductor. In a further embodiment, the central processing base station uses the same techniques to send signals to an access point for transmission.

A system and method for signal distribution within a sensor array uses a coaxial transmission line. Taps are affixed to the outer conductor of the coaxial transmission line and include field coupling portions extending into the internal field region of the coaxial transmission line. Electromagnetic energy propagating within the transmission line can be extracted to power the sensors. Sensor signals can be modulated onto radio frequency signals and propagated along the transmission line to distribute the sensor signals.

The present invention allows remote antenna units for radio frequency signal transmission and receipt to operate without the requirement for remote electrical power supplies or for connecting cables that incorporate electrical conductors. According to an aspect of the present invention, an optical communications system employing radio frequency signals comprises a central unit; at least one remote unit having at least one optoelectronic transducer for converting optical data signals to radio frequency signals and converting radio signals to optical signals and at least one antenna to receive and send radio frequency signals; at least one optical fiber data link between the central unit and the remote unit for transmitting optical data signals therebetween; and at least one optical fiber power link between the central unit and the remote unit for providing electrical power at the remote unit.

A cordless cautery and cutting surgical device includes a modular battery and a surgical handle. The battery has a cordless radio-frequency-signal-generation assembly generating an output radio-frequency signal and a first selectively removable connector part. The surgical handle has a first handle body portion with a bipolar cautery and cutting end effector. The end effector has jaws with bipolar contacts and a cutting blade disposed between the jaws. The handle has a second body portion connected to the first body portion, defines therein an aseptically sealable battery-holding compartment selectively exposed to the environment and removably holding therein the battery, and a second selectively removable connector part operable to removably hold the first connector part thereto. The second connector part has conductors electrically connecting the RF assembly to the bipolar contacts for supplying the radio-frequency signal to the bipolar contacts when the first and second connector parts are removably secured together.

Embodiments in accordance with the invention provide communication between vehicles and traffic control devices and/or other vehicles. The communication system provides for communication of system variables such as: signal setting (e.g., red/yellow/green light), signal direction, time to signal change, signal sequence (e.g., next traffic flow), red light runner alert, signal failure, driver urgency, vehicle presence, absolute vehicle location, toll collection information, vehicle speed, roadway condition (e.g., ice on bridge surface), traffic impairments (e.g., delay ahead). The communication system also provides for communication of system variables such as: speed, acceleration/deceleration, braking, lane change with direction, malfunction (e.g., stall). The system communicates utilizing wireless optical, acoustic and/or radio frequency signaling methods.

Methods and apparatus for generating and processing a signal are disclosed. The signal may comprise a plurality of mutually orthogonal subcarriers constituting a plurality of bands. The signal may be either an optical or a radio frequency signal.

A multiple-mode multiple band transceiver is disclosed. Some embodiments include a multiple-channel transmitter including a plurality of selectable transmit-channel components, the plurality of selectable transmit-channel components sharing at least one element coupled to a modulator, the plurality of selectable transmit channel components forming at least first and second transmit channels configured to generate radio-frequency signals using at least a first and a second multiple-access modulation technique, and a first switch configured to enable at least one of the first and second transmit channels to transmit a communication signal using at least one of the first and the second multiple-access modulation techniques.

A monitoring and location system for mobile objects is shown for monitoring the presence or absence of items of personal value packed by a traveler within a suitcase or other item of luggage which away from home on a trip. Each item of personal value is provided with an electronic signally device or chip, such as a separate RFID tag, which has a unique electronic indicia stored thereon for transmission by a radio frequency signal upon request from an RFID interrogation unit. The interrogation unit is mounted on the interior of the item of luggage and monitors the presence of each RFID tag as the item of personal value is placed within the item of luggage.

An apparatus and a method for outputting a location of a wireless charging device in a portable terminal are provided. A radio frequency signal is received from the wireless charging device. A strength and a reception direction of the radio frequency signal are determined by analyzing the radio frequency signal. The location of the wireless charging device is estimated based on the strength and the reception direction of the radio frequency signal. The estimated location is output using a pre-designated location notification scheme.

A surgical device includes a radio-frequency-signal-generation assembly including a radio-frequency-signal-generation circuit operable to generate a radio-frequency signal at an output and adapted to couple to a switch-mode power supply and a surgical handle including an end effector having at least one jaw with at least one electrical contact, the end effector including at least one signal input that electrically connects to the output to provide the radio-frequency signal at the at least one electrical contact.

A mobile station is configured to detect entry into a premises of an enterprise in response to short range or near field radio-frequency signals. The mobile station receives signals from one or more short range wireless beacons located in the premises, and the mobile station sends identifiers from the beacon signals to a location server. The location server processes the identifiers to determine location of the mobile station within the premises and sends information to the mobile station, for presentation to the user of a map of the premises showing the determined location of the mobile station within the premises. Entry detection also may be used to automatically check-in a customer/user of the mobile station with a system of the enterprise used by personnel of the enterprise at the premises to enable the personnel to customize interactions the customer while the customer is at the premises.

An optical line terminal, a passive optical network and a radio frequency signal transmission method in the communication technical field are provided. The passive optical network comprises: an OLT, an ODN and at least one ONU. The OLT comprises: at least one transmitting unit, which provides one dedicated downstream optical carrier and two dedicated upstream optical carriers for ONU; the two dedicated optical carriers for ONU are configured to carry ONU upstream radio frequency signals; a multiplexing/demultiplexing unit; and at least one receiving unit which obtains the upstream signal from the demultiplexed upstream optical signal. The bandwidth of wireless access network is enhanced, and the design of ONU is simple.

In a method and apparatus for magnetic resonance imaging of an interconnected region of a human body on the basis of a partially parallel acquisition (PPA) by excitation of nuclear spins and measurement of the radio-frequency signals produced by the excited nuclear spins, a number of spin excitations and measurements of an RF response signal are implemented simultaneously in every component coil of a number of RF reception coils. As a result a number of response signals are acquired that form a reduced dataset of received RF signals for each component coil. Additional calibration data points are acquired for each reduced dataset. A complete image dataset is formed for each component coil on the basis of the reduced dataset for that component coil and at least one further, reduced dataset of a different component coil. A spatial transformation of the image dataset of each component coil is implemented in order to form a complete image of each component coil.

A biometric identification system which uses a UHF radio frequency identification (RFID) tag storing a first set of specified biometric information on an identity card; which bears a facial picture of the card carrier. An identification system comprising an antenna using radio frequency signals and a reader is used to read the first set of specified biometric information from the tag when the identify card is within sensing range of the identification system. A camera captures and digitalizes the facial features of the card carrier when the card carrier approaches a designated area and transmits this digital data to a computer which compares the first set of specified biometric information obtained by the reader from the identity card and the second set of digital facial information obtained from the camera to the stored biometric information to determine if the two sets of biometric information are a match.

A transceiver architecture for wireless base stations wherein a broadband radio frequency signal is carried between at least one tower-mounted unit and a ground-based unit via optical fibers, or other non-distortive media, in either digital or analog format. Each tower-mounted unit (for both reception and transmission) has an antenna, analog amplifier and an electro-optical converter. The ground unit has ultrafast data converters and digital frequency translators, as well as signal linearizers, to compensate for nonlinear distortion in the amplifiers and optical links in both directions. In one embodiment of the invention, at least one of the digital data converters, frequency translators, and linearizers includes superconducting elements mounted on a cryocooler.

In one embodiment, the present invention is a method and apparatus for identifying wireless transmitters. In one embodiment, a method for identifying a transmitter in a wireless computing network includes extracting one or more radio frequency signal characteristics from a communication from the transmitter and generating a fingerprint of the transmitter in accordance at least one of the extracted radio frequency signal characteristics.

A system and method for identifying geographical areas which distribute poor radio frequency coverage is provided. The method includes measuring a radio frequency signal of a mobile unit in response to a trigger. The method continues with mapping the location data of the radio frequency signal which represents the positioning of the mobile unit at a given time. The method continues with recording the location data of the mobile unit and storing the location data in a database. The trigger, which prompts the radio frequency measurement, may be a timer expiring, a dropped call, or a mobile power increase signaling a weak signal. In any form, a post processing module may be configured in order to record, store and organize the location data into a report, such as a coverage map. Embodiments of this disclosure will display geographic areas that have poor radio frequency and allow for an administrator to identify trouble spots by a geographical region.

A radio frequency identification system (20) generally includes at least one container (22), a radio frequency identification tag (24) capable of transmitting a radio frequency signal associated with the container, and a radio frequency device, such as a repeater (26) associated with the radio frequency identification tag or the container for enhancing readability of the radio frequency signal.

A system and method for receiving a signal, comprising an input adapted to receive a radio frequency signal having a strong interferer; a signal generator, adapted to produce a representation of the interferer as an analog signal generated based on an oversampled digital representation thereof; and a component adapted to cancel the strong interferer from radio frequency signal based on the generated analog signal to produce a modified radio frequency signal substantially absent the interferer. The system typically has a nonlinear component that either saturates or produces distortion from the strong interferer, which is thereby reduced. The system preferably employs high speed circuits which digitize and process radio frequency signals without analog mixers.

A beam formation circuit and an apparatus and a method of receiving radio frequency signals making use of a smart antenna are described in which the amount of computation tasks required for the weight calculation is significantly reduced. In realizing the directivity of the smart antenna, the output signals corresponding to a plurality of sub-carriers are weighted with a common antenna weight for each of the antenna elements.

A radio frequency (RF) demodulation circuit comprising a harmonic rejection mixing stage capable of receiving and mixing an incoming radio frequency (RF) signal having a frequency RF and a reference local oscillator (LO) signal having a frequency LO and generating an output signal in which out-of-band harmonic signals are suppressed. The harmonic rejection mixing stage comprises 1) a multiphase local oscillator (LO) generator for receiving the reference LO signal and generating M phase-shifted local oscillator signals having frequencies LO and 2) M mixers, each of the M mixers receiving the incoming radio frequency signal and one of the M phase-shifted local oscillator signals. Each of the M mixers generates a subcomponent signal. The subcomponent signals are then scaled and combined to produce the output signal.

A radio over fiber link apparatus for transmitting/receiving radio frequency up/downlink signals in a TDD mobile communication system. The radio over fiber link apparatus includes a center site for receiving radio frequency signals from an access point of the mobile communication system. The center site has a first electro-optic converter for converting the radio frequency signals into optical signals, bias control of the first electro-optic converter being performed based on the switching of TDD signals; and a remote for transmitting the radio frequency signals to a mobile communication terminal through an antenna. The remote site has a first photoelectric converter for converting the optical signals transmitted through an optical fiber from the center site into radio frequency signals.

Systems and methods for providing radio frequency transceiver user equipment in a packet based radio frequency signaling communication system are disclosed. User equipment is provided with closed subscriber group “CSG” capability including permanent storage for a CSG whitelist, the whitelist including identifiers of CSGs the user equipment is a member of. Base stations transmit signals including identifiers corresponding to CSGs the base station supports. The base station or cell selection process performed by the user equipment includes selecting cells that are part of the CSG whitelist. In additional embodiments, the user equipment includes user alterable storage for a user controlled CSG whitelist. The user alterable storage may further be partitioned into permanent and temporary portions. In an exemplary method, the user controls the cell selection process using the CSG whitelist information stored in the user equipment. Methods for managing the CSG whitelist are described.

A solar panel system includes a plurality of the panels connected together in one or more panel strings. An embodiment includes a signal generator module connected to the photovoltaic panel strings injecting a multiple radio frequency signal onto each of the strings and a detector module analyzing a frequency response echo from the panel strings. The signal generator may include a string coupling module communicating with a controller. The detector module analyzes the echo to obtain an analog fingerprint for each panel string and determine whether the fingerprint for each panel string is within an acceptable range. The detector module initiates an alarm when one of the fingerprints is outside the acceptable range. During night time, when no current is being produced by the photovoltaic cells, a DC or AC source may be connected to the panel strings to inject a signal onto the strings for the same purpose.