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| Number | Title | Issue Date |
| 7414424 | Directional power detection by quadrature sampling Power measurement and control in transmission systems are affected by changes in load conditions. A method and system are provided for detecting and controlling power levels independent of such load conditions. ... | 08/19/2008 |
| 7353771 | Method and apparatus of providing power to ignite and sustain a plasma in a reactive gas generator According to a first aspect, a power supply and a method of providing power for igniting a plasma in a reactive gas generator is provided that includes (i) coupling a series resonant circuit that comprises a resonant inductor and a resonant capacitor between a switc... | 04/08/2008 |
| 7327984 | Device and method for measuring receive sensitivity of communication system including receive-only path Disclosed is a device (200) and a method for measuring a receive sensitivity of a communication system having a transmit and receive path and a receive-only path, like a base station (100) employing space diversity by means of one transmit and receive ... | 02/05/2008 |
| 7194390 | Predictor of minimal noise figure for wideband amplifier A predictor allows the computation of the greatest lower bound of the noise figure pertaining uniformly over the operating band of a wideband amplifier. This computation is done directly from noise-parameter data of the amplifier. ... | 03/20/2007 |
| 7155267 | Apparatus and method for monitoring antenna state of mobile station An apparatus and method are provided for monitoring an antenna state of a mobile station. A resister may be provided between a battery voltage terminal and a power source voltage terminal of a power amplifier. A voltage level corresponding to a dropped amount of a v... | 12/26/2006 |
| 7151382 | Apparatus and method for radio frequency power and standing wave ratio measurement A magnitude of radio frequency voltage and current, input into a load from a radio frequency power source, are measured at a single point along a transmission line. Phase difference between voltage and current is also measured. These measurements are used to compute... | 12/19/2006 |
| 7141991 | Instrumentation current loop An instrumentation current loop, including a transducer having transducer output terminals. A power source is connected in series to the transducer. A bridge has a first arm and a second arm extending between a pair of input terminals, where the input terminals of t... | 11/28/2006 |
| 7088089 | Power detector with constant voltage decoupling A power detector for measuring the average power, without constant voltage, of modulated or unmodulated high frequency or microwave signals is described. The power detector includes a signal line connected to a high frequency input. A detection line is capacitively ... | 08/08/2006 |
| 7076213 | Apparatus and method for testing voltage standing wave ratio in a W-CDMA mobile communication system An apparatus and method for testing a voltage standing wave ratio (VSWR) in a wideband code division multiple access (W-CDMA) mobile communication system. Upon detecting a VSWR test request, a controller determines an oscillation frequency information and a power le... | 07/11/2006 |
| 7071700 | Characterizing analog and digital telephone circuits and other types of wiring systems using frequency domain reflectometry (FDR) The structural and termination characteristics of a telephone or other wiring circuit can be determined by generating a continuous stream of low-energy electrical signals, injecting these into the circuit under test, and analyzing the energy reflected at impedance c... | 07/04/2006 |
| 7058555 | Predictor for optimal selective power transfer A predictor for optimal transducer power gain computes the maximum transducer power gain attainable by a lossless matching network for a given load operating over selected non-overlapping (disjoint) sub-bands within a frequency band of operation. ... | 06/06/2006 |
| 7053628 | High reflection microwave tuner using metal-dielectric probe and method Combination metal-dielectric microwave probes are sliding on the central conductor of an electro-mechanical microwave two-probe load pull tuner and create higher reflection factor over a wider frequency bandwidth than was previously possible using pure dielectric pr... | 05/30/2006 |
| 6989676 | Apparatus and method for sensing particle and water concentrations in a medium A method and apparatus for detecting soot and/or water concentrations in diesel engine oil having a dielectric constant may include a device for measuring a change in the dielectric constant at a first frequency, a device for measuring a change in the dielectric con... | 01/24/2006 |
| 6925616 | Method to test power distribution system A method for testing a core power distribution system for an integrated circuit chip which includes arranging a plurality of experiments for an integrated circuit chip, performing the plurality of experiments for the integrated circuit chip over a range of frequenci... | 08/02/2005 |
| 6882162 | System for the wireless transmission of information and/or energy between a removable vehicle seat and the vehicle body A system for the wireless transmission of information and energy between a removable vehicle seat and the vehicle body, in which the vehicle seat is detected by measuring the inductance. In this connection, the period of an oscillating circuit is determined, in whic... | 04/19/2005 |
| 6853181 | Silicon-on-insulator channel architecture for automatic test equipment A channel architecture for use in automatic test equipment is disclosed. The channel architecture comprises pattern generation circuitry and timing circuitry responsive to the pattern generation circuitry to generate timing signals. Formatting circuitry coupled to t... | 02/08/2005 |
| 6788072 | Apparatus and method for sensing particle accumulation in a medium A method and apparatus for detecting an accumulation of particles with a medium such as the soot content in diesel engine oil including generating a first waveform at a first frequency and a first voltage level to produce a standing wave having a voltage null point ... | 09/07/2004 |
| 6657440 | Propagation of waves through materials A method for creating a full or partial transparency in a material comprising the steps of creating a first electromagnetic wave adjacent to the material, saturating the material with the first electromagnetic wave, creating a second electromagnetic wave ... | 12/02/2003 |
| 6411106 | Method and apparatus for moisture sensing using microwave technologies This invention provides a method and apparatus for the sensing of moisture using microwave technology. The apparatus provides a wave guide having a linear array of slots in its broadwall. A detector detects reflected energy of microwave signals over a fre... | 06/25/2002 |
| 6380748 | Apparatus and method for diagnosing antennas using switches An apparatus and method for diagnosing antennas using switches, wherein a system is configured in such a manner that a plurality of switches determine a data flow of a signal for test. Therefore, the antenna diagnosing apparatus can be so simplified in ci... | 04/30/2002 |
| 6313644 | Apparatus and method for measuring voltage standing wave ratio in antenna of base station An apparatus for measuring a voltage standing wave ratio of a base station. The apparatus comprises: a unit for measuring the voltage standing wave ratio of a transmitting terminal by coupling an input signal from the base station, and by comparing the di... | 11/06/2001 |
| 6192318 | Apparatus and method for automatically matching microwave impedance A recording medium suitable for use in an impedance matching apparatus adapted to a waveguide transmitting a microwave to a load. The apparatus includes detecting diodes and a computer. The recording medium includes a program, which includes predetermined... | 02/20/2001 |
| 5982251 | Tuner for radio frequency transmission lines A tuner for radio frequency coaxial cable transmission lines is provided. It requires only one micrometer adjusting screw since the capacitor electrode that mates with the central conductor of the coaxial line is not only curved to give a large area in pr... | 11/09/1999 |
| 5804976 | Device for determining the ratio of substances A measurement device and a method for indicating the ratio of two or more substances having different dielectric constants which form a body of material is described. The measurement device comprises an oscillator (1), a transmission line (5) connected at... | 09/08/1998 |
| 5796322 | Apparatus to seal against leakage of high frequency radiation through a slot In high frequency apparatus such as for example an rf resonant cavity or a waveguide, it is often necessary to include a slot to permit a probe or other member to be located in the high frequency region and be moveable along the slot. Sealing means arrang... | 08/18/1998 |
| 5659253 | Temperature compensated radio frequency detector circuit An RF detector circuit (28), which may be utilized in an output power control loop (10) for an RF transmitter, includes a bridge circuit (50) including a first arm (52) containing a first diode (D2) which rectifies the RF signal and a second arm (54) whic... | 08/19/1997 |
| 5621331 | Automatic impedance matching apparatus and method Methods for rapidly adjusting the impedance of a variable impedance apparatus to match the impedance of a source to the impedance of a load, where the load impedance is a nonlinear function of the power delivered to the load, are described. In addition, a... | 04/15/1997 |
| 5539322 | Calibrated microwave dielectric coating thickness gauge The present invention relates to a method and related apparatus for the nondestructive determination of n layers of coating of a target having n layers of dielectric coating applied to an electrically conductive base material, comprising; a generator of e... | 07/23/1996 |
| 5507010 | Arrangement for measuring at frequencies actually used for signalling, the condition of a receiving antenna positioned apart from other base station equipment at a base station of a radio system An arrangement for measuring the condition of a receiver antenna at a base station, utilizing an antenna amplifier positioned in connection with an antenna apart from other base station equipments, e.g., at a mast. A measuring signal is generated in conne... | 04/09/1996 |
| 5498863 | Wavelength-sensitive detectors based on absorbers in standing waves An optoelectronic detector includes multilayered semiconductor structures that are placed at particular positions in a standing wave pattern in order to measure the intensity of the light beams passing through said structures' layers. The detector is made... | 03/12/1996 |
| 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 measuring section of a voltage standing wave detector is mounted... | 03/21/1995 |
| 5365391 | Magnetic reproducing head having a distributed-constant circuit type magnetic field detector A distributed-constant circuit type magnetic field detector which includes a magnetic member whose permeability varies with changes in a magnetic field applied thereto disposed at a point where a magnetic field is produced in a distributed-constant circui... | 11/15/1994 |
| 5216372 | Microwave steel belt location sensor for tires The thickness of the layers of rubber covering the steel belts within a tire can be measured by transmitting a microwave signal toward the outer surface of the tire and measuring the phase shift of the signal reflected by the tire. In the preferred embodi... | 06/01/1993 |
| 5103181 | Composition monitor and monitoring process using impedance measurements Radio frequency bridge techniques are used to parameterize the complex dielectric properties of solids, liquids, gasses and mixtures thereof. This parameterization is performed in an electrically isolated, physically open structure which allows continuous... | 04/07/1992 |
| 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 impedance adjusting method therefor. In the apparatus and m... | 01/07/1992 |
| 5069070 | Method for determining the alcohol content and/or the calorific value of fuels via propagation parameters Especially precise and reliable measurements and evaluations are obtained by measuring one or more propagation parameters of electromagnetic waves in a wave guide or resonator at least partially filled with fuel and evaluated in an evaluating circuit as t... | 12/03/1991 |
| 5039949 | RF absorber test system A method of testing the reflectivity of RF absorber materials utilizes an elongated chamber lined with RF absorber material and having a source antenna at one end, with the other end terminating in either a "short circuit", or a piece of RF absorber mater... | 08/13/1991 |
| 4996491 | Measurement of the position of an elongated element The linear position of an elongated element (1) is measured using a transmission medium (2). The transmission medium comprises an emitter (3) of microwaves and a receiver (4) of microwaves and has at its one end the elongated element (1) and at its other ... | 02/26/1991 |
| 4739515 | Voltage standing wave ratio bridge measuring circuit A method and apparatus for measuring the voltage standing wave ratio on a radio frequency transmission line. The bandwidth of radio frequency signals over which the apparatus accurately operates is improved by the use of a filter to unload terminating res... | 04/19/1988 |
| 4345202 | Method of detecting soot in engine oil using microwaves To measure the percentage of soot in a diesel engine crankcase oil without any significant influence by oil additives or contaminants which build up in the oil during usage. The relative permittivity of the oil is measured in the microwave region of 8-12 ... | 08/17/1982 |
