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| Number | Title | Issue Date |
| 7592794 | Integrated low power received signal strength indicator (RSSI) with linear characteristic An RSS indicator with a linear characteristic that is of a simple configuration, low current consumption and small die area requirements, comprises a pair of input transistors with coupled emitters and base electrodes to which an input signal is differentially appli... | 09/22/2009 |
| 7477050 | Magnetic sensor having a coil around a permeable magnetic core A differential wireless sensing device includes a first resonant device impinged on a substrate having a predetermined natural frequency, the first resonant device having a changeable resonant frequency in response to an environmental condition, and a second resonan... | 01/13/2009 |
| 7402794 | Radiometer imaging system and method thereof A radiometer imaging system includes an antenna array having a plurality of sub-arrays, each being formed of a plurality of antenna elements arranged in a sub-Y-type, a receiver array having the same number of receivers as the antenna elements, each receiver being a... | 07/22/2008 |
| 7356074 | Estimation of multipath channel with sub-chip resolution The present invention provides a method and apparatus for estimating a multipath channel with sub-chip resolution. In general, secondary signals are characterized based on correlating a received signal including multipath signals, which include a main and the second... | 04/08/2008 |
| 7339363 | Variable gain received signal strength indicator An RSSI circuit provides a relatively inexpensive technique for accurately measuring received signal strength over a wide dynamic range. A received signal is processed by a rectifier circuit that generates a series of DC offsets of increasing magnitude. The DC offse... | 03/04/2008 |
| 7253737 | Automated antenna trim for transmitting and receiving semiconductor devices A radio frequency communication device and methods of testing and tuning an antenna attached thereto are disclosed. A radio frequency communication device comprises internal circuitry and an antenna having a plurality of antenna segments associated therewith. Each a... | 08/07/2007 |
| 7250747 | Radiometer measurement linearization system and method A radiometer system includes a dual channel, quadrature hybrid amplifier circuit that receives an antenna signal and a known reference signal to equalize gain in two parallel gain stages. A detector circuit receives a signal from the quadrature hybrid amplifier circ... | 07/31/2007 |
| 7239122 | Multi-channel radiometer imaging system A radiometer system includes a housing and an RF board contained within the housing. Balanced radiometer channels receive an unknown signal and known reference. Each balanced radiometer channel includes at least one quadrature hybrid and amplifier circuit to provide... | 07/03/2007 |
| 7221139 | Multi-channel radiometer imaging system A radiometer system includes a housing and an RF board contained within the housing. Balanced radiometer channels receive an unknown signal and known reference. Each balanced radiometer channel includes at least one quadrature hybrid and amplifier circuit to provide... | 05/22/2007 |
| 7199570 | Multi-channel radiometer imaging system A radiometer includes a housing and an RF board carried by the housing. A hybrid and amplifier circuit receives an unknown signal and a known reference signal. A switch receives signals as inputs from the hybrid and amplifier circuit and switches between the inputs.... | 04/03/2007 |
| 7170929 | Digital signal transmission system and method of displaying transmission condition in digital signal transmission system A digital signal transmission system using a digital modulation system comprising a digital signal transmitter having a first digital signal processing unit and a digital signal receiver receiving a digital signal from the transmitter, wherein the digital signal rec... | 01/30/2007 |
| 7135848 | Highly integrated radiometer sensor cell A highly integrated radiometer sensor cell includes a base having opposing surfaces with one surface adapted for surface mounting on a board. A radio frequency (RF) feed receives RF signals and at least one MMIC is operatively connected to the RF feed and receives t... | 11/14/2006 |
| 7116703 | Multipath signal strength indicator A multipath signal strength indicator is included in a communications receiver which is responsive to a communications channel subject to a multipath signal. The multipath signal strength indicator includes circuitry for estimating the characteristics of the communi... | 10/03/2006 |
| 7088086 | Multi-channel radiometer imaging system A radiometer includes a housing and an RF board carried by the housing. A hybrid and amplifier circuit receives an unknown signal and a known reference signal. A switch receives signals as inputs from the hybrid and amplifier circuit and switches between the inputs.... | 08/08/2006 |
| 7054396 | Method and apparatus for multipath signal compensation in spread-spectrum communications systems The equalizer of the present invention operates on input multipath signal samples, preferably at chip or sub-chip resolution, to remove or substantially cancel the effects of one or more secondary signals from the main path signal. Using predetermined path informati... | 05/30/2006 |
| 7049805 | Radio frequency power measurement An unknown RF power is converted to a voltage by a detector (11). The voltage is converted to a number by a digitiser (12). A separate and fixed RF power reference (14) drives a second detector (15), whose voltage output is also converted... | 05/23/2006 |
| 7034516 | Multi-channel radiometer imaging system A radiometer system includes a housing and an RF board contained within the housing. Balanced radiometer channels receive an unknown signal and known reference. Each balanced radiometer channel includes at least one quadrature hybrid and amplifier circuit to provide... | 04/25/2006 |
| 7030600 | Broadband microwave power sensor A circuit for sensing radio frequency energy. The circuit includes a Wheatstone bridge having at least one element thereof thermally responsive to the radio frequency energy passing therethough differently from radio frequency energy passing though at least one othe... | 04/18/2006 |
| 6999726 | Radio station and radio system A radio system (10) and radio system (1, 2) in which the value of parameters for a model of a received multipath signal transmitted by a remote station (20) are estimated. A sounding signal transmitted and received by the radio station is used t... | 02/14/2006 |
| 6970002 | Tube measurement and calibration system A tube measurement and calibration system including a network analyzer for measuring tube radio frequency phase, a calibration adapter for calibrating tube radio frequency power and phase, an amplifier for amplifying input radio frequency power into the tube, and a ... | 11/29/2005 |
| 6912247 | Digital signal transmission system and method of displaying transmission condition in digital signal transmission system A digital signal transmission system using a digital modulation system comprising a digital signal transmitter having a first digital signal processing unit and a digital signal receiver receiving a digital signal from the transmitter, wherein the digital signal rec... | 06/28/2005 |
| 6844715 | Synthetic RF detection system and method Outputs of a linear RF detector and a logarithmic RF detector are multiplexed individually to a single digitizer or simultaneously to a respective digitizers. A process generates a composite waveform from the resulting digitized data, either at a later time in the f... | 01/18/2005 |
| 6806812 | Automated antenna trim for transmitting and receiving semiconductor devices A radio frequency communication device and methods of testing and tuning an antenna attached thereto are disclosed. A radio frequency communication device according to the present invention is disclosed comprising internal circuitry and an antenna having a plurality... | 10/19/2004 |
| 6801029 | Microwave dielectric spectroscopy method and apparatus Dielectric spectroscopy is carried out by coupling non-radiated microwave energy from an antenna to a sample to detect changes in the permittivity of the sample within the antenna's near field. The frequency response of the antenna exhibits resonant frequencies in a... | 10/05/2004 |
| 6719068 | Probing device with microwave transmission Geological probing device comprising a hollow probing rod to be extended into the geological matter to be probed, and a measuring probe fitted to the probing rod, said measuring probe comprising sensors for obtaining information about the matter. The measurin... | 04/13/2004 |
| 6720757 | Variable gain received signal strength indicator An RSSI circuit provides a relatively inexpensive technique for accurately measuring received signal strength over a wide dynamic range. A received signal is processed by a rectifier circuit that generates a series of DC offsets of increasing magnitude. The DC offse... | 04/13/2004 |
| 6700929 | Method and apparatus for multipath parameter estimation in spread-spectrum communications systems A training method provides an advantageous technique for estimating secondary propagation path parameters based on learning propagation path characteristics for a selected number of secondary propagation path signals. In a multipath environment, a receive... | 03/02/2004 |
| 6662125 | Electromagnetic wave analyzer and program for same An electromagnetic wave analyzer and program which can handle non-uniform cells with smaller computation errors. A given computational domain is divided into a plurality of cells for the purpose of finite difference approximation. For each space point, a ... | 12/09/2003 |
| 6541950 | Multipath meter The invention is a multipath meter that analyses estimates of parameters associated with a direct signal component and one or more multipath signal components of a signal received by an antenna. The meter analyses the parameter estimates in order to facil... | 04/01/2003 |
| 6407540 | Switched attenuator diode microwave power sensor The present invention relates to a switched attenuator diode microwave power sensor and more particularly to a true average, wide dynamic range microwave power sensor utilizing a switched step attenuator on the sensor input. The present invention provides... | 06/18/2002 |
| 6382762 | Peltier humidity determination system for inkjet printing A humidity determination system for a hardcopy device, such as an inkjet printing mechanism, determines ambient humidity so printing routines may be adjusted to provide fast, high quality output in all environments. The system includes a thermal device ha... | 05/07/2002 |
| 6257049 | Ambient humidity measurement using microwaves A humidity sensor which utilizes microwave energy to determine a particular humidity value, e.g., a relative humidity, a specific humidity, or a dew point, without the need for delicate moving parts. The microwave humidity sensor requires little if any ma... | 07/10/2001 |
| 6242901 | True average wide dynamic range microwave power sensor using diode stack attenuator-diode stack The invention provides a true average, wide dynamic range microwave power sensor using a diode-stack-attenuator diode stack technology. The invention provides a diode stack microwave power sensor which includes an RF signals receiver having wide dynamic p... | 06/05/2001 |
| 6154682 | Self-checking circuit in microwave equipment A self-checking circuit in a microwave equipment comprising: directional couplers each for separating and extracting a portion of a microwave signal from each monitoring point on a microwave main signal path; detectors each for detecting an extracted sign... | 11/28/2000 |
| 5856803 | Method and apparatus for detecting radio-frequency weapon use An apparatus for detecting abnormal radio-frequency signals has an antenna responsive to a radio-frequency signal. The radio frequency signal has a plurality of signal components, each of which has an associated amplitude. A circuit attenuates each of the... | 01/05/1999 |
| 5734579 | Rotational-device method and system A rotational-device test system and method is provided to classify a rotational device according to the type of drive sound thereof. A divider divides the time-series data of an amplitude of the drive sound of an HDD digitized in a converter at intervals ... | 03/31/1998 |
| 5025208 | Method of measuring radio-frequency interfering voltages For fast measurement of radio-frequency interference voltages (also called RFI voltages) within a predetermined frequency range in conformity with rating standards, the maximum and minimum peak voltage levels are measured during tuning of the frequency ra... | 06/18/1991 |
| 4890055 | Compensated chirp fourier transformer A method and circuit for compensating a chirp Fourier transformer wherein alignment tones of known frequency are provided in the input signal, and the transforms of the alignment tones in the output signal are measured. The output signal is converted to b... | 12/26/1989 |
| 4859934 | Apparatus for measuring the frequency of microwave signals A microwave frequency detection receiver utilizing a prescaler comprised of one or a plurality of cascaded analog frequency dividers for down-converting received microwave signals to a predetermined compressed radio frequency bandwidth, connected to a com... | 08/22/1989 |
| 4818949 | Microwave and millimeter-wave spectrum analyzer An apparatus is described which performs real time spectrum analysis of large bandwidth radio frequency signals. The apparatus allows the simultaneous monitoring of all frequencies within the band of interest, and operates in the presence of multiple freq... | 04/04/1989 |
