Matches 151 - 200 out of 251 < 1 2 3 4 5 6 >
Match Document Document Title
5491715 Automatic antenna tuning method and circuit  
A method of matching the resonant frequency of an antenna resonant circuit (18, 46) to the output frequency of a transmitter output stage (26), the method includes the step of providing a powering...
5483680 Tuning method for automatic antenna couplers  
A method and circuit for detecting and reducing the impedance mismatch between the directional coupler and the antenna of an RF communications system exposed to externally generated RF signals. The...
5477089 Automotive electronic control systems  
A method of increasing the immunity of an automotive electronic control system to electromagnetic interference, comprises the steps of measuring the impedance of means conducting an input to a...
5473291 Solid state plasma chamber tuner  
A solid state automatic tuner is used in a plasma processing system for measuring and adjusting a voltage standing wave ratio of the system. The tuner has a switched variable inductor circuit...
5467455 Data processing system and method for performing dynamic bus termination  
A data processing system and a method for performing dynamic bus signal termination uses a dynamic bus termination circuitry (14 or 16) with a device (10 or 12). The circuitry is enabled when data...
5467453 Circuit for providing automatic SCSI bus termination  
Disclosed are a circuit and method for providing automatic termination for a small computer systems interface ("SCSI") bus. The circuit resides within a bus controller comprising (1) a control...
5459440 Automatic impedance matching with potential monitoring means  
A method and apparatus for impedance matching a transmitter to a transmission medium of a communication system during normal operation of the system. The method comprises feeding signals from the...
5444564 Optoelectronic controlled RF matching circuit  
A photonic RF impedance matching system that includes an RF photonically controlled impedance matching circuit having adjustable impedance and power transfer characteristics, and feedback control...
5424691 Apparatus and method for electronically controlled admittance matching network  
An apparatus for dynamically matching a radio-frequency source for semiconductor processing to a load, and particularly adapted for plasma sputtering and etching processes, comprises an admittance...
5422608 Adaptive transmission line termination  
An adaptive transmission line termination which includes a variable voltage controlled resistor (16) connected either in series with the sending end of transmission line (10) or in parallel with...
5408690 Antenna supervising apparatus comprising a standing wave ratio measuring unit  
In an antenna supervising apparatus for supplying a multiplexed signal comprised of a plurality of carrier wave signals respectively outputted from a plurality of transmitters through a...
5399977 Microwave power source apparatus for microwave oscillator comprising means for automatically adjusting progressive wave power and control method therefor  
In a microwave power source apparatus for a microwave oscillator for generating a microwave, a DC power source supplies a DC power for generating the microwave to the microwave oscillator. A...
5398261 Integrated circuit having controller impedances and application to transceivers, in particular for communication between units of a system  
The invention relates to an integrated circuit including impedances having precise values. To compensate for process variations and drift in impedances, the circuit includes automatic control means...
5347222 Signal/noise ratio optimization tuning system  
A signal/noise ratio optimization tuning system, which can be used for tuning receiver antennas in Magnetic Resonance Imaging receiver systems, has a switch-controlled noise source means that is...
5225847 Automatic antenna tuning system  
In an automatic tuning system for an antenna having a single variable reactance element, the power transmitted to the antenna and the power reflected from the antenna on the feedline are sensed....
5216392 Automatically controlled varactor tuned matching networks for a crystal filter  
A crystal filter network comprises at least one variable impedance network (103a, 103b), at least one crystal filter (103c), and a control circuit (110). Each variable impedance network (103a,...
5195045 Automatic impedance matching apparatus and method  
An automatic impedance matching apparatus for matching an RF-signal generator to a load, such as a plasma etching chamber, is disclosed. The matching apparatus comprises a matching network having...
5187454 Electronically tuned matching network using predictor-corrector control system  
A method, and corresponding apparatus, for matching a generator impedance with an unknown and possibly changing load impedance, to maximize power transferred to the load. The apparatus includes an...
5159295 Microwave vector modulator and device for matching a microwave load  
A microwave vector modulator (4) of the reflective type is used to match a microwave load. The adjustable reflection of the vector modulator is obtained by semiconducting surfaces (18, 19, 20, 21),...
5149931 Power source for electric discharge machining  
A power source for electric discharge machining, which performs a semi-mirror-finish machining operation with a surface roughness of 1 μm Rmax or less. The power source includes either a resonance...
5079507 Automatic impedance adjusting apparatus for microwave load and automatic impedance adjusting method therefor  
There are disclosed an automatic microwave impedance adjusting apparatus for a microwave load connected to a microwave oscillator through a microwave transmission line, and an automatic microwave...
5057783 Automatic impedance matching  
Apparatus (1) for performing an electrical test on a cable (3) used in local area networks (LAN's). A source (37) produces electrical signals transmitted through the cable. A resistance circuit...
5053725 Circuit configuration for the automatic tuning of a matching network  
The invention relates to a circuit configuration for the automatic tuning of a matching network (2) disposed between an electrical energy source (1) and a load (3). Herein two measured signals (U E...
5041803 Automatic load matching circuit for microwaves using multi-element matching device  
An automatic load-matching circuit for microwaves, disposed on a transmission line between a signal source and a load. Signal detection means for detecting a travelling wave component and a...
4965607 Antenna coupler  
An automatic antenna coupler is disclosed. The antenna coupler automatically matches the output impedance of a 50-ohm transmitter to the input impedance of a non-broad-band antenna, such as a whip,...
4951009 Tuning method and control system for automatic matching network  
A matching network matches an output impedance of a generator with an input impedance of a load. The matching network includes a first variable impedance element, a second variable impedance...
4855695 Automated microwave tuning system for de-emulsifier systems  
Apparatus for automatic tuning of microwave energy in a de-emulsifier system usng a wave guide applicator with impedance matching element wherein microwave energy incident on and reflected from the...
4843634 High power systems and method of tuning same  
A method of automatically tuning a high power system by measuring the gardient of component value against efficiency for each component impedance in turn and, for each component, finding two points...
4798982 Active symmetrical balance hybrid circuit  
The invention relates to an active symmetrical balance hybrid circuit. The hybrid circuit includes an input, an output and an in/output as well an impedance circuit per half section connected to...
4682176 Active matching transmit/receive module  
A transmit/receive module is disclosed that provides selectable impedance matching between: a power amplifier and the antenna of a phased array when the radar is transmitting, and selectable...
4679007 Matching circuit for delivering radio frequency electromagnetic energy to a variable impedance load  
A matching circuit is provided for delivering radio frequency electromagnetic energy from a radio frequency power supply to a variable impedance load such as a gas plasma. The matching network...
4647871 Adaptive impedance mismatch detector system  
An adaptive impedance mismatch detector system is provided for determining whether or not a particular load impedance is matched or mismatched to the characteristic impedance of a transmission...
4629940 Plasma emission source  
An impedance matching network for continuously and automatically maximizing RF power transfer to a plasma emission torch includes a dual phase detector network. Signals from the detector network...
4621242 R.F. impedance match control system  
An R.F. impedance match control system. The reflection coefficient of the system is compared to a threshold to determine a mismatch condition which is corrected by selectively changing in...
4612669 Antenna matching system  
A system for adjusting the antenna matching network of a radio system in the presence of an interfering signal in the matching network being adjusted comprises a loop from which the interfering...
4502025 High speed PIN diode switched antenna coupler and method  
A high speed antenna coupler and method for rapidly switching binary weighted values of inductance and capacitance into and out of the circuit between an antenna and a utilization circuit without...
4499358 Driving circuit for radio frequency dryer  
A driving circuit for supplying a radio frequency electrical signal to the applicator section of a radio frequency dryer includes a voltage controlled oscillator, supplying a signal to an amplifier...
4493112 Antenna tuner discriminator  
A simple technique and circuit is disclosed to replace prior Z-θ type discriminators in supplying the loading and phasing control signals to the impedance matching network in an automatic antenna...
4486723 Diode switching system for a selectable impedance matching network  
A pair of oppositely poled PIN diodes is connected in series across a reactive element. First and second switching circuits responsive to a common control network are serially connected between...
4486722 Pin diode switched impedance matching network having diode driver circuits transparent to RF potential  
A coupler network with pin diode switches receives biasing and control information through a biasing network that is essentially transparent to the RF operation of the coupler network.
4485360 Apparatus for and method of impedance matching  
An rf load is matched to an rf source by a matching network having series and shunt impedances connected between the source and load. A network coupled to the load derives a first rf signal...
4477817 Switching circuit including pin diodes for impedance matching  
An impedance matching network suitable for tuning an antenna includes a plurality of reactive elements and control circuits for selectively switching these elements into and out of the circuit....
4476578 Device for detecting the optimum anode load impedance of a tube transmitter in a high frequency transmission chain  
A device for detecting the optimum anode load impedence of a transmitter tube in a high frequency transmission chain. A phase shift circuit phase shifts by kπ/2 (with k being a positive or...
RE31638 Wideband transceiver with EMI suppression  
A data communications transceiver for transmitting signals to and from the communicating medium, with the transceiver including an input terminal, a short time constant differentiator connected to...
4430619 Adaptive radio frequency intermodulation minimizing apparatus  
Apparatus is provided for inhibiting the generation of intermodulation products in a radio frequency amplifier coupled to a circulator. A control circuit generates a control signal exhibiting...
4382252 Intrusion warning system  
An intrusion warning system for indicating the presence of an intruder to a given area includes an antenna provided around the area and which is insulated from the ground. An oscillator is provided...
4380822 Transmit-receive switching circuit for radio frequency circulators  
A transmit-receive switching circuit is provided for switching a transmitter and a receiver to common antenna via a common signal path. A circulator is employed in the common signal path. The flow...
4375051 Automatic impedance matching between source and load  
An R.F. generator for providing power to a load via a transmission line wherein load impedance is automatically matched to the surge impedance of the transmission to provide maximum transfer of...
4373581 Apparatus and method for radio frequency heating of hydrocarbonaceous earth formations including an impedance matching technique  
The disclosure relates to a technique for radio frequency heating of hydrocarbonaceous earth formations in which a high power radio frequency transmitter is impedance matched to a transmission line...
4356458 Automatic impedance matching apparatus  
Automatic impedance matching apparatus in which a matching unit is connected between a radio frequency source and a load and which comprises variable capacitors and inductor, the capacitors being...
Matches 151 - 200 out of 251 < 1 2 3 4 5 6 >