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7622932 |
Measuring apparatus, and detection device
A measuring apparatus that measures a characteristic of a device under measurement is provided. The measuring apparatus includes: a signal generating section that outputs a forward signal to the...
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7489141 |
Surface micro sensor and method
The present invention provides a micro sensor for monitoring the cleaning and drying processes of surfaces of dielectric films, micro features in porous dielectric films and biologic or other cells...
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7466144 |
Microwave measurement system for piston displacement
A microwave measurement system is utilized for the determination of displacement of a piston in a fluid filled cylindrical structure. The piston plus cylindrical encasement of the hydraulic system...
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7466143 |
Clearance measurement systems and methods of operation
A method is provided and includes exciting a sensor with an incident signal and generating a reflected signal by reflecting the incident signal from the sensor. The incident signal and the...
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7454242 |
Tissue sensing adaptive radar imaging for breast tumor detection
A tissue-sensing adaptive radar method of detecting tumours in breast tissue uses microwave backscattering to detect tumours which have different electrical properties than healthy breast tissue....
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7315170 |
Calibration apparatus and method using pulse for frequency, phase, and delay characteristic
In a device for measuring the properties of a device under test connected by a signal transmission path having reciprocity, a terminal on the device under test side of the signal transmission path...
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7271575 |
Oscilloscope based return loss analyzer
A system, apparatus and method for performing differential return loss measurements and other measurements as a function of frequency uses a digital storage oscilloscope (DSO) having spectral...
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7129719 |
Apparatus for detecting defect in circuit pattern and defect detecting system having the same
Provided is an apparatus for detecting a defect of a circuit pattern which includes a resonator, a first power supply unit connected to one end of the resonator to apply power to the resonator, a...
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7121719 |
Radio-thermometer system and method for measuring electromagnetic energy radiated from an interior of a human body using the same
A radio-thermometer system, and a method for measuring electromagnetic energy radiated from an interior of a human body, includes an antenna for receiving thermal energy radiated from a target...
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7098672 |
Flash vapor sampling for a trace chemical detector
The presence of trace molecules in air is often determined using high sensitivity gas sensing instruments, such as an ion mobility spectrometer. Such devices are commonly utilized in the fields of...
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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...
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7061221 |
Reduced complexity transmission line and waveguide fault tester
A four-port junction is substituted for a six-port junction in a frequency domain reflectometer, which reduces the parts count and therefore cost and size of the reflectometer while improving...
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7053631 |
VSWR-measurement with error compensation
A method and base station apparatus are presented for calculating the Voltage Standing Wave Ratio of a radio frequency transmission line which is coupled with a first and a second directional...
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7005862 |
Method and apparatus for measuring electric characteristics of cable assembly, and computer product
A propagation delay time of a cable assembly is measured by calculating a half of a time difference between a branch point of time-dependent variations of amplitude of reflection coefficient...
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6903557 |
Microwave moisture sensing via waveguide with slot array
A generator ( 6 ) directs microwave signals to a waveguide ( 1 ) having a linear array of slots ( 2 ), and the signals are received by measuring device ( 5 ). The local permittivity or moisture...
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6882161 |
Method of measuring dielectric constant of PCB for RIMM
Disclosed herein is a method of measuring a dielectric constant of a Printed Circuit Board (PCB) for a Rambus Inline Memory Module (RIMM), which includes the steps of measuring a length of a Rambus...
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6867600 |
Electronic circuit and method for testing a line
The invention relates to an electronic circuit and method for testing a line ( 10 ). According to the invention the signal generator ( 20, 30 ) comprises a random bit series generating means for...
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6798216 |
Resonant microwave sensor
An apparatus for determining the properties of a material, that is to be examined, by applying a swept-frequency high frequency signal and measuring a reflection factor of the resonance signal. The...
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6614240 |
Microwave determination related to a material such as chloride found in a cement based composition
Determinations are made related to the presence of a predetermined material in concrete under test using previously obtained model information. In one embodiment, the predetermined material...
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6597185 |
Apparatus for localized measurements of complex permittivity of a material
An apparatus for localized measurements of complex permittivity of a material is provided. A probe ( 10 ) analyzes the complex permittivity of a sample ( 11 ), the probe ( 10 ) having a balanced...
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6580278 |
Technique for the measurement of reflection coefficients in stored energy systems
Methods and systems for measuring the reflection coefficient of a network are disclosed. The methods and systems measure the reflection coefficient by exciting a device under test with a driving...
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6472885 |
Method and apparatus for measuring and characterizing the frequency dependent electrical properties of dielectric materials
A method and apparatus for measuring complex permittivity of dielectric materials in solid, liquid, or gas form. The apparatus is includes a TEM or quasi-TEM transmission line test fixture, which...
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6404299 |
Devices, methods, and systems for network hub partial termination
The present invention provides a system and device for a network hub that includes a single valued resistor placed in series with each transmission line such that reflected and other unwanted waves...
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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,...
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6348804 |
Vector network analyzer
In a vectorial network analyzer having at least two measuring ports, whose measuring arms respectively have quad gates with the accompanying measuring points, a separate high-frequency generator is...
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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...
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6249128 |
Automated microwave test system with improved accuracy
An automatic test system for microwave components. The test system includes internally switchable calibration references. As part of a calibration routine, incident power from a source is measured....
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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...
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6147502 |
Method and apparatus for measuring butterfat and protein content using microwave absorption techniques
A self calibrating method and apparatus for measuring butterfat and protein content based on measuring the microwave absorption of a sample of milk at several microwave frequencies. A microwave...
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6060888 |
Error correction method for reflection measurements of reciprocal devices in vector network analyzers
An error correction method improves measurement accuracy of a vector network analyzer by reducing reflection measurement errors for a broad class of devices, such as filters, switches, cables,...
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6046594 |
Method and apparatus for monitoring parameters of an RF powered load in the presence of harmonics
A method and apparatus for measuring electrical characteristics (e.g. current, voltage, phase, etc.) between a power source and a load at a set of harmonic frequencies to determine information...
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6005397 |
Microwave thickness measurement and apparatus
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...
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5886534 |
Millimeter wave sensor for on-line inspection of thin sheet dielectrics
A millimeter wave sensor is provided for non-destructive inspection of thin sheet dielectric materials. The millimeter wave sensor includes a Gunn diode oscillator (GDO) source generating a mill...
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5642039 |
Handheld vector network analyzer
A handheld vector network analyzer (VNA) providing a wide bandwidth test signal F O utilizing a narrowband test signal synthesizer which provides the test signal through a frequency divider or...
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5502394 |
Compact, portable device for measuring the reflection coefficient of a structure exposed to microwave radiation
In order to measure the amplitude and the phase of the reflection coefficient of a structure (S) such as a radar protection radome, particularly following a repair, a measuring device is proposed,...
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5488310 |
Return-loss detection for serial digital source
A return-loss detector for a serial digital signal source uses a return-loss bridge circuit to exploit the broadband spectral characteristics of a serial digital signal from the signal source to...
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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...
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5233306 |
Method and apparatus for measuring the permittivity of materials
A method and apparatus for determining the permittivity of a sample is disclosed. The method includes applying an AC electrical signal in the microwave frequency range via a coaxial probe having an...
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5227730 |
Microwave needle dielectric sensors
Method and apparatus for in vivo or in vitro sensing of complex dielectric properties of lossy dielectric materials, particularly biological tissue. Configured as a needle-like dielectric sensor, a...
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5157338 |
Antenna VSWR indicator
The invention described a pocket size antenna VSWR indicator having a self-contained low level wideband RF signal source which is applied to an antenna under test through a four arm RF resistive...
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5150063 |
Bridge for measuring the reflection coefficient
In a reflection-coefficient bridge, the voltage drop across a neutral arm of the bridge is supplied to the indicator via a coaxial cable. The center conductor of the coaxial cable is coupled to the...
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5073756 |
Method and apparatus for measuring the volumetric water content of mineral and/or organic mixtures
A method and an apparatus for determining the volumetric water content of a mineral and/or organic mixture with dielectric measurements. The apparatus includes a probe body having a hollow cylinder...
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5072189 |
Scalar network analyzer
A low cost and portable scalar network analyzer for the simultaneous measurement of forward and reflected scalar scattering parameters of devices under test. Plural UHF oscillators of similar...
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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...
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5034708 |
Programmable broadband electronic tuner
A programmable microwave network test device is capable of establishing a multitude of reflection and transmission coefficients determined by a set of digital inputs. The programmable network...
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4988943 |
VSWR meter arrangement with a display output having a linear scale
A VSWR meter arrangement with a linear scale. The VSWR display is made linear by inputting the V forward and V reverse signals to a first op amp-based circuit to provide a first output=K(V f -V...
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4962359 |
Dual directional bridge and balun used as reflectometer test set
A test set for use in measuring S-parameters with a network analyzer includes a first directional bridge, a second directional bridge and a single balun with two outputs mounted in an RF housing. A...
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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,...
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4795886 |
Temperature control in which the control parameter is the degree of imperfection in the impedance matching
A temperature control system is disclosed for controlling heating current to a heater having an impedance which varies substantially with temperature. The change in impedance of the heater changes...
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4791351 |
Method and apparatus for rapidly testing passive components by reflectometry in the VHF range
An apparatus for testing passive two terminal devices in the VHF range comprises an electrical signal generator whose frequency is variable over the VHF range, a distributed constant line having a...
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