693 results about "Rf system" patented technology

A dual-chamber plasma processing apparatus comprises two reaction spaces which are equipped with different gas inlet lines and different RF systems. Each reaction space is provided with an RF wave entry path and an RF wave return path to supply RF power from an RF power source and return RF power to the same RF power source.

A radio frequency (RF) system and method for determining the location of a wireless node in a wireless mesh sensor network is disclosed. The wireless node can be a wireless terminal, a wireless transceiver, or a wireless transmitter. The wireless network includes a plurality of wireless nodes linked to a digital computer, such as, for example, a server or a location processor, via a communications link. The method comprises deploying a plurality of identifier wireless nodes each at a predetermined location. Node-to-node data for the wireless nodes are generated, the node-to-done data providing information regarding a wireless node's communication with other wireless nodes. The node-to-node data is transmitted to the digital computer where the node-to-node data is processed to generate a map identifying the locations of the wireless nodes.

The Wrist-Mounted Electrical Computer Components (WECC) invention comprises an Electrical Computer Component (ECC), a wrist or watch band, an attachment or integrating system that connects the ECC with the wristband, and a communication port, either a hardwire system is used such as a USB compatible connection or radio frequency (RF) system is used to interface with an external host computer. The WECC is a significant enhancement due to its implementation of universal adapters to interface with various computers, which will provide a more secure and stable form of transport for electronic computer components and their data. The WECC will (1) prevent loss of individual computer components thereby enhancing security and protecting loss of important electronic information, (2) provide a novel form for transporting electronic computer components, and (3) enhance the adaptation of universal adapters to interface with multiple computers. The WECC can carry electronic keys, medical history, calendars, credit card information, along with files from school or work. Storing electronic information on a person's wrist could greatly reduce the need current state of the art methods for transporting data through Personal Data Assistants (PDAs), Laptop computers, Zip(TM) drives, Compact Disks, and Smart Cards.

A linearizer reduces nonlinear intermodulation distortion in radio frequency and microwave systems by first directly generating in-phase and quadrature nonlinear intermodulation products of the system input. Controllable amounts of each phase are then added back into the system such that the vector sum of nonlinear intermodulation products at the output is reduced or eliminated by destructive interference, while the fundamentals are substantially unaffected. The quadrature distorted signals are generated with two lightly-biased and thus overdriven differential pairs having gain-determining degeneration impedances that are in quadrature with each other. The amount of each quadrature phase summed to the output is controlled with electronically tunable four-quadrant variable attenuators. The quadrature phasing enables rapidly convergent tuning to minimize distortion using conventional scalar spectral analysis. The advantages of a linearizer using rectangular vector coordinate system are significant.

A Radio Frequency Identification (RFID) tag according to one embodiment includes a controller for setting one or more alarm states upon occurrence of one or more alarm conditions, and a visual display device under control of the controller, the visual display device providing a visual, audible, and/or tactile indicator of an alarm condition when an alarm state is set. The visual, audible, and/or tactile indicator of the alarm condition optionally can only be reset by an authorized entity, or cannot be reset.

The electrosurgical systems and corresponding methods of the present disclosure involve an electrosurgical generator, sensing circuitry, and a controller. The electrosurgical generator includes a radio frequency (RF) output stage that supplies power to tissue. The sensing circuitry measures impedance of tissue. The controller controls the power supplied from the RF output stage to track a nonlinear power curve until the power supplied from the RF output stage has reached a predetermined peak power of the nonlinear power curve. The controller further determines whether a tissue reaction has occurred based on impedance measured by the sensing circuitry and controls the power supplied from the RF output stage during a cooling phase if the controller determines that a tissue reaction has occurred. The controller may further control the power supplied from the RF output stage to track a linear power curve.

Power consumption management for a radio frequency identification (RFID) reader for a radio frequency (RF) transponder system. The RF system includes an RFID device and a host. The RFID reader includes an RFID controller, an excitation signal transmitter, a response signal receiver, an optional RFID device detector, a host interface input/output, and a user interface. The method includes establishing a first power consumption level for the RFID reader, establishing a second power consumption level that is different from the first, and changing between the first level and the second level. The difference between the first level and the second level is derived from at least one technique for power consumption management. A plurality of techniques are presented. Among the potential benefits to reduced power consumption are increased energy efficiency and reduced radiated emissions. The option of choosing between power consumption levels presents unique opportunities in system design, implementation, and operation.

The invention discloses a synchronization and time delay compensation method between base band unit and radio system, wherein a high-speed chain between a base band unit BBU and a radio unit RRU realizes synchronization of BBU and RRU via ascending and descending time marks, at descending direction, via two stages of time delay of BBU and RRU, adjusting the compensation of chain time delay, at ascending direction, using data driving to generate base band receiving interruption to compensate chain time delay. The inventive method can realize the synchronization between base band and radio system, and realize the accurate compensation of time delay. The invention can apply the signals of GSM/EDGE between base band and radio for different transmission protocols, while the invention can be used for data transmission with fixed frame.

A millimeter-wave radio frequency (RF) system, and method thereof for transferring multiple signals over a single transmission line connected between modules of a millimeter-wave RF system. The system comprises a single transmission line for connecting a first part of the RF system and a second part of the RF system, the single transmission line transfers a multiplexed signal between the first part and second part, wherein the multiplexed signal includes intermediate frequency (IF) signal, a local oscillator (LO) signal, a control signal, and a power signal; the first part includes a baseband module and a chip-to-line interface module for interfacing between the baseband module and the single transmission line; and the second part includes a RF module and a line-to-chip interface module for interfacing between the RF module and the single transmission line, wherein the first part and the second part are located away from each other.

A linearizer reduces nonlinear intermodulation distortion in radio frequency and microwave systems by first directly generating in-phase and quadrature nonlinear intermodulation products of the system input. Controllable amounts of each phase are then added back into the system such that the vector sum of nonlinear intermodulation products at the output is reduced or eliminated by destructive interference, while the fundamentals are substantially unaffected. The quadrature distorted signals are generated with two lightly-biased and thus overdriven differential pairs having gain-determining degeneration impedances that are in quadrature with each other The amount of each quadrature phase summed to the output is controlled with electronically tunable four-quadrant variable attenuators. The quadrature phasing enables rapidly convergent tuning to minimize distortion using conventional scalar spectral analysis. The advantages of a linearizer using rectangular vector coordinate system are significant.

The INERTIAL SENSOR TRACKING SYSTEM is an overall system installation consisting of wireless body pack transmitters, broadband telemetry transceivers, computer and monitoring equipment, and emergency power generation for tracking personnel in an underground mine environment. The system is designed to function with normal primary power and on battery operation in the event of an emergency. In the past inertial sensors have been large spinning mass gyroscopes and large mass-based accelerometers. These inertial sensors have required high voltage three phase electrical supplies. The “wearable” body pack must be battery operated and the sensors must be small and lightweight. Micro-Electro-Mechanical (MEM) sensors fulfill both the requirements of low weight and low power consumption. The accuracy of the MEM sensor has been developed sufficiently to incorporate, with de-noising algorithms, an accurate position-sensing device. The proliferation of broadband TCP/IP protocol based RF systems provides a standardized medium of transmission, which will work in an underground environment.

The embodiment of the invention discloses a radio frequency system and electronic equipment. The radio frequency system comprises a radio frequency transceiver, a radio frequency processing circuit, aselector switch module, a first antenna, a second antenna, a third antenna and a fourth antenna; the radio frequency processing circuit comprises a first transmitting module, a second transmitting module, a first receiving module, a second receiving module, a first duplexer, a second duplexer, a first selection switch and a first filtering module. A radio frequency system works in a non-independent networking mode; the first antenna is used for transmitting a first low-frequency band and receiving a main set of the first low-frequency band; the second antenna is used for transmitting in a second low-frequency band and receiving in a main set of the second low-frequency band; the third antenna is used for receiving in a diversity manner in the second low-frequency band, the fourth antennais used for receiving in a diversity manner in a first low-frequency band, and the first filter is used for filtering frequency bands except the first low-frequency band. According to the embodiment of the invention, the system can ensure the reliability of an uplink signal.

A simple RF system tracks a missile, bullet or artillery round and determines the instantaneous attitude of the spinning projectile while in flight. The system is particularly useful in command-guided weapons systems where line-of-sight is maintained from the launch platform to the target. The system includes a first pair of linearly polarized transmit antennas spaced apart on the projectile for transmitting a signal and a harmonic of that signal. A receiver on the launch platform determines the roll angle and either the yaw or pitch angle from the received signals. To determine the remaining angle, either the receiver samples the received signals ninety degrees out of phase or a second pair of transmit antennas are mounted on the projectile, preferably ninety degrees from the first pair, for transmitting another pair of harmonic signals.

A radio frequency (RF) transceiver having improved low power operating modes. The RF transceiver comprises: 1) a radio frequency (RF) modem section comprising: a) receive path circuitry for receiving and down-converting an incoming RF signal to thereby produce an incoming baseband signal; and b) transmit path circuitry for receiving and up-converting an outgoing baseband signal to thereby produce an outgoing RF signal; 2) a baseband section comprising baseband circuitry for receiving and processing the incoming baseband signal and for generating the outgoing baseband signal; and 3) a power-saving apparatus for determining that the baseband section is idle and, in response to the determination, reducing a power supply voltage providing power to the baseband section.

The invention provides for a magnetic resonance imaging system (100) for acquiring magnetic resonance data (142,144) from an imaging zone (108). Execution of the instructions causes a processor (133) controlling the MRI system to: acquire (200) imaging magnetic resonance data (142) with radio frequency excitation of the radio frequency system enabled; acquire (202) noise radio frequency data (148) using at least one RF noise detection coil, wherein the noise radio frequency data is acquired simultaneously with the imaging magnetic resonance data; acquire (204) calibration magnetic resonance data (144) with radio frequency excitation of the radio frequency system disabled; acquire (206) reference radio frequency data (146) using the at least one RF noise detection coil, wherein the reference radio frequency data is acquired simultaneously with the calibration magnetic resonance data; and calculate (208) a noise calibration (150) using the reference radio frequency data and the calibration magnetic resonance data.

Described are RF tracking system and method. The RF system may include a shell for holding a plurality of containers which store a material that interferes with RF communications. The shell includes a bottom container supporting surface and a plurality of leg extensions attached thereto; the shell extends away from the bottom surface. The tracking system also includes at least one RF tag attached to a first one of the leg extensions. The tag has a memory arrangement storing data relating to at least one of an identity of the shell, an identity of the containers held in the shell and a material stored in the containers. Furthermore, the tracking system includes at least one RF scanner communicating with the tag to collect the data and a computing arrangement which includes a database and communicating with the scanner to update the database as a function of the collected data. The tag is situated at a predetermined distance away from the containers held in the shell to overcome an electromagnetic dampening effect of the material.

A system and method of inventorying multiple objects utilizing a multi-level or a chained radio frequency identification system. The system includes a master tag and a plurality of upper level tags and lower level tags associated with respective objects. The upper and lower level tags communicate with each other and the master tag so that reading of the master tag reveals the presence and absence of upper and lower level tags. In the chained RF system, the upper and lower level tags communicate locally with each other in a manner so that more remote tags that are out of range of some of the upper and lower level tags have their information relayed through adjacent tags to the master tag and thence to a controller.