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6690176 Low-loss tunable ferro-electric device and method of characterization  
A tunable ferroelectric component and a narrowband resonant circuit for measuring the loss of the ferroelectric component. The ferroelectric component may be a capacitor integrated in the resonant...
6646450 Method and apparatus for near losslessly measuring inductor current  
The present invention provides an improved measuring circuit for measuring a current of an inductor with minimum losses and errors. According to one embodiment of the invention, the measuring...
6452400 Method of measuring negative ion density of plasma and plasma processing method and apparatus for carrying out the same  
A probe ( 6 ) is brought into contact with a plasma produced by ionizing Ar gas, a saturation current (I es2 ) at which current flowing through the probe is saturated when the potential of the...
5656932 Non-contact type wave signal observation apparatus  
A non-contact type wave signal observation apparatus measures transfer functions of a distributed constant network. A signal is input from a network analyzer to the network to be measured....
5105157 Apparatus for determining the average water film thickness of road surfaces  
A system for determining the average water film thickness on surfaces, and in particular roadways, with the reflection of microwaves on the surface of the film of water being measured. To be able...
5020920 Method and apparatus for millimeter-wave detection of thermal waves for materials evaluation  
A method and apparatus for generating thermal waves in a sample and for measuring thermal inhomogeneities at subsurface levels using millimeter-wave radiometry. An intensity modulated heating...
4823280 Computer-controlled electronic system monitor  
An electric power monitor system for radio communication (trunking and paging repeater base station) systems includes a plurality of input switches, power sensors, a power monitor having a display,...
4816767 Vector network analyzer with integral processor  
An RF network analyzer is disclosed which is suitable for both laboratory and automated production measurements. An important feature of the invention is the ability of the user to completely...
4808913 Asymmetrical coupling circuit  
An asymmetrical coupling circuit for use in a network analyzer is provided with a pair of couplers coupled to the input and output ports of a device under test (DUT) for improving the dynamic range...
4808912 Six-port reflectometer test arrangement and method including calibration  
A test arrangement for testing high frequency electrical devices consisting of two 6-port reflectometers which are both connected to a device under test. In order to calibrate the test arrangement,...
4777429 Test arrangement  
A six-port network for characterizing a microwave or R.F. device includes a signal source (1) capable of generating three signals of the same frequency but relative phase differences, and combines...
4758776 RF interferometer  
An RF interferometer is provided in which a power source is connected via first and second directional couplers to a load or device under test. The second coupler is connected to a second detector...
4727311 Microwave moisture measurement using two microwave signals of different frequency and phase shift determination  
A microwave measurement apparatus is disclosed for measuring an unknown property of a test material, such as moisture content, by transmitting microwave beams through such material so that a...
4680538 Millimeter wave vector network analyzer  
A vector network analyzer system for measuring the complex impedance of devices and components at millimeter wavelengths is disclosed. A pair of directional couplers provide samples of the signal...
4674325 Microwave moisture sensor  
A microwave moisture sensor operates on the principle that an emitted microwave is attenuated in rotary resonance with water molecules. The microwave moisture sensor includes measurement and...
4621226 Apparatus and method for determining an input electrical characteristic of a device under test  
Apparatus and method for determining an input electrical characteristic of a device under test by power-related measurements made by the device under test, wherein the input characteristic to be...
4571545 Six-port reflectometer  
A six-port reflectometer includes first, second and third forward directional couplers to transmit power from a source for reflection at a measurement port. The couplers also divert incident and...
4486627 Cable load status detector  
An arrangement for monitoring the admittance of a line during a frequency sweep is disclosed which upon detection of the characteristic admittance level determines the loaded or unloaded status of...
4434397 Remote load current sensor  
Antenna arrays with more than one radiating element often require a calibration or adaptive technique to monitor the individual antenna currents and provide some form of correction. This invention...
4219770 Insertion loss and phase shift measurement system and method  
Insertion loss measurement at microwave frequencies is achieved using an improved IF substitution technique wherein the IF test signal is applied to a feedback loop which generates a feedback...
3835379 DETECTOR CIRCUITS FOR SIGNAL TRANSMISSION  
Standing wave ratio (VSWR) detector provides sensing and monitoring of antenna tuning for broad band signal transmission of 2 to 80 MHz by sampling of forward and reflected signals to produce a...
3796948 STANDING WAVE DETECTOR  
A system and a method for determining the impedance of a given microwave device by measuring the standing wave in a transmission line is disclosed. A section of transmission line having a plurality...
3794941 AUTOMATIC ANTENNA IMPEDANCE TUNER INCLUDING DIGITAL CONTROL CIRCUITS  
An automatic antenna tuner includes digital control circuits for selecting reactive tuning elements of an antenna impedance matching network. The tuner arrangement provides for rapid transforming...
3789301 METHOD AND APPARATUS FOR MEASURING THE PARAMETERS OF A TRANSISTOR OR OTHER TWO-PORT DEVICE AT MICROWAVE FREQUENCIES  
A first sinusoidal signal at a microwave frequency is applied to the input port of a transistor while simultaneously therewith a second sinusoidal signal at the same frequency is applied to the...
3571702 APPARATUS FOR THE WIDE-BAND IMPEDANCE MEASUREMENT OF MICRO-WAVE CIRCUITS IN MICRO-WAVE MULTIPLE-POLE ARRANGEMENTS  
A process for the wideband measurement of the impedance of microwave current circuits in microwave multiple pole arrangements, i.e., N ports. Into at least one cavity resonator comprised by the N...
3416077 Multifunction high frequency testing apparatus in which r.f. signals are converted to intermediate frequencies and processed by common electronic circuits  
3278840 Radio-frequency bridge having a delta input matching circuit  
3268807 Instrumentation for displaying characteristics of electromagnetic wave devices  
3233172 Method of determining the dielectric constant of a material using calibrated standards  
3145338 Combination transmission system phase and impedance sensor having a single center-tapped probe  
2961605 Combination loading detector and standing wave indicator circuit  
2939076 Microwave amplitude and phase measurement  
2822517 Standing wave detector  
2818547 Impedance measuring devices  
2818546 Oscillographic impedance indicators  
2806994 Ratio and product meter  
2786180 Servo regulated microwave energy source  
2775737 Standing wave measuring system  
2762972 Automatic impedance measuring device  
2756387 Microwave apparatus for measuring the impedance of waveguide components  
2746015 Method of and means for measuring impedance and related quantities  
2746014 Transmission meter  
2680837 Apparatus for measuring impedance in the microwave region  
2654863 Microwave test equipment  
2639317 Apparatus for determining impedance characteristics of transmission lines  
2630475 Means for measuring impedance at radio frequencies  
2630474 Transmission line measuring system  
2630473 Transmission line measuring apparatus  
2580679 High-frequency directional coupler apparatus  
2557811 Impedance measurement at ultra high frequencies  
Matches 1 - 50 out of 56 1 2 >