Did You Know...
...that a workman who left the soap mixing machine on too long was responsible for making Ivory Soap? He was so embarrassed by his mistake that he threw the mess in a stream. Imagine his dismay when the evidence of his error floated to the surface! Result: Ivory soap, the soap that floats.
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| Number | Title | Issue Date |
| 6049212 | Connector saving adapters and SWR bridge configuration allowing multiple connector types to be used with a single SWR bridge An SWR bridge with an accompanying set of connector saving adapters for connecting between the test port of the SWR bridge and a test device. The SWR bridge includes a branch opposite the test port which has an impedance set to substantially compensate fo... | 04/11/2000 |
| 6025709 | One port complex transmission and group delay measurements A variable termination load switch (102) is provided to enable transmission and group delay measurements to be made of a device under test (DUT) (103) using only one port of a vector network analyzer (VNA) (100). The variable termination load switch (102)... | 02/15/2000 |
| 5920281 | Radar test system for collision avoidance automotive radar A radar test system for testing a collision avoidance radar system. The radar test system includes circuitry to downconvert a signal from the collision avoidance radar to an intermediate frequency signal, to delay the intermediate frequency signal to simu... | 07/06/1999 |
| 5920609 | Metallic access test extension system architecture A metallic access test extension system architecture for a digital transmission system is provided. The digital transmission system includes a local end and a plurality of remote ends, each of said plurality of remote ends including a digital communicatio... | 07/06/1999 |
| 5909192 | Method of displaying graphs with markers A graph of data samples in a graph field on the display, including a first coordinate axis, a second coordinate axis, a trace indicating characteristics of data samples with respect to the coordinate axes, and a plurality of markers indicating positions o... | 06/01/1999 |
| 5905421 | Apparatus for measuring and/or injecting high frequency signals in integrated systems A device for measuring and/or injecting a high frequency signal, such as a 20 GHz signal from and/or into a system, is provided. The device includes a connector coupled to a coaxial cable at one end. A relatively small, low inductive rectangular member is... | 05/18/1999 |
| 5903698 | Fiber optic connection assembly A connector assembly for optical fiber cables which provides an increased density of optical fiber connections in a confined space. The assembly includes a front panel defining a first plane; and a connection panel having a face defining a plane having an... | 05/11/1999 |
| 5894248 | Controlled loop gain YIG tuned oscillator circuit A YIG oscillator circuit including a closed loop control system which maximizes loop gain during start-up and minimizes loop gain after start-up to minimize gain compression. In one embodiment the closed loop control circuit includes a PIN diode coupled b... | 04/13/1999 |
| 5831440 | SWR bridge configuration enabling extended precision and measurement range when measuring through a precision coax airline A microwave test kit including a SWR bridge with one or more accompanying precision airlines for connecting between the test port of the SWR bridge and a test device. The SWR bridge includes a branch opposite its test port which includes an adapter having... | 11/03/1998 |
| 5832369 | Microwave receiver configured to provide non-referenced distance measurements along with signal magnitude measurements A receiver configured to measure phase change (Ɗ$c;) in a signal transmitted from a microwave signal source, such as a cell site for cellular telephones, the transmitted signal including a carrier signal (F1) added to a modulation signal (F... | 11/03/1998 |
| 5825669 | Method of updating automatic calibration to provide a perceived perfect through connection A method for updating automatic calibration to provide a perfect through connection during the calibration of the VNA. After the VNA is initially calibrated, a user may assess the calibration of the through connection to determine if the quality is suffic... | 10/20/1998 |
| 5821897 | Simulator for testing a collision avoidance radar system A simulator for testing the performance accuracy or calibrating a collision avoidance radar system. The simulator includes circuitry for receiving a signal from the collision avoidance radar system and for generating a signal tracking the frequency of the... | 10/13/1998 |
| 5801525 | Frequency discriminating power sensor A power sensor that enables determination of the frequency of a microwave signal comprises a signal input that receives the microwave signal at a particular frequency, at least one sensor that produces a first and second output corresponding to the power ... | 09/01/1998 |
| 5790062 | Delta modulator with pseudo constant modulation level The present invention is directed to delta modulation in which the modulation level is optimized to improve overall system performance. A delta modulator in accordance with the invention includes a step size controller having a overload detector, a step s... | 08/04/1998 |
| 5773985 | One port complex transmission and group delay measurements An apparatus for characterizing transmission coefficient and group delay for a bi-directional two port device under test (DUT) using only one port of a measurement device, such as a vector network analyzer (VNA). The apparatus in one embodiment includes a... | 06/30/1998 |
| 5764727 | Metallic access test extender A metallic access test extender includes an office unit and a remote unit coupled to the office unit via a digital transmission system. A voltage controlled current source is included in the office unit and a voltage controlled voltage source in the remot... | 06/09/1998 |
| 5734176 | Impedance controlled test fixture for multi-lead surface mounted integrated circuits A test fixture for testing an integrated circuit having leads. The test fixture includes a substrate with top and bottom surfaces and holes extending from the top to the bottom surface. The integrated circuit is mounted on the top surface with each lead l... | 03/31/1998 |
| 5715183 | Internal automatic calibrator for vector network analyzers A calibration technique for a vector network analyzer (VNA) enabling calibration standards to be included internal to the VNA. To calibrate the VNA utilizing the internal calibration standards, error terms a, b and c of two two-port error boxes E are defi... | 02/03/1998 |
| 5708377 | Low power dual sampler utilizing step recovery diodes (SRDS) A low power dual sampler including two sampler switches with a step recovery diode (SRD) in each sampler switch. A local oscillator (LO) signal is provided through a power amplifier and transformer to baluns in the sampler switches without utilizing a pow... | 01/13/1998 |
| 5642039 | Handheld vector network analyzer A handheld vector network analyzer (VNA) providing a wide bandwidth test signal FO utilizing a narrowband test signal synthesizer which provides the test signal through a frequency divider or harmonic generator. With a 550-1100 MHz narrowband t... | 06/24/1997 |
| 5587934 | Automatic VNA calibration apparatus An automatic VNA calibration apparatus is described which requires only a single connection at each of two test ports on a VNA and the pressing of one button. The apparatus comprises a housing for housing electrical components and a multi-throw switch whi... | 12/24/1996 |
| 5576675 | Microwave connector with an inner conductor that provides an axially resilient coaxial connection An inner conductor for a high frequency microwave coaxial connector comprising a cylindrical conducting member with a central bore and slots that form fingers, and a cylindrical pressure contact member that is inserted in the cylindrical conducting member... | 11/19/1996 |
| 5548538 | Internal automatic calibrator for vector network analyzers A calibration technique for a vector network analyzer (VNA) enabling calibration standards to be included internal to the VNA. To calibrate the VNA utilizing the internal calibration standards, error terms a, b and c of two two-port error boxes E are defi... | 08/20/1996 |
| 5524281 | Apparatus and method for measuring the phase and magnitude of microwave signals A measurement system is provided which comprises: source circuit for receiving feedback signals and for providing respective signals at respective discrete frequencies in a prescribed microwave frequency range, wherein the respective provided signals at r... | 06/04/1996 |
| 5374902 | Ultra low phase noise microwave synthesizer An ultra low phase noise microwave synthesizer for providing an output signal having a frequency FO of from 2 GHz to 20 GHz using a first voltage controlled oscillator (VCO), a first frequency comparing circuit for driving said first VCO to a f... | 12/20/1994 |
| 5345193 | Phase locked loop with loop gain stabilization circuit A phase locked loop includes a linear phase detector responsive to a first signal having a predetermined range of frequencies and a second signal for comparing the relative phase of the first signal and the second signal, and a loop gain stabilization cir... | 09/06/1994 |
| 5339049 | Ultra low noise frequency divider/multiplier Frequency divider and multiplier circuits are provided comprising a voltage controlled oscillator, a presteer circuit comprising a frequency comparator, a sampling phase detector circuit comprising a sampler, a pair of prescalers for providing frequencies... | 08/16/1994 |
| 5200713 | Multiple magnetically tuned oscillator YIG oscillator apparatus comprises both an FET-based YIG oscillator circuit and a bipolar transistor-based YIG oscillator circuit inside a single magnetic structure. Both YIG spheres are disposed in the single air gap of the magnetic structure, which is d... | 04/06/1993 |
| 5191294 | Measuring noise figure and y-factor Apparatus for measuring the noise parameters of a device under test (DUT), with full compensation for impedance mismatches between the DUT and the test apparatus. The apparatus includes an S-parameter measuring device, such as vector network analyzer (VNA... | 03/02/1993 |
| 5146171 | Full reversing millimeter test set A full reversing millimeter test set comprising a pair of test head assemblies which are connected to an analyzer by means of coaxial cables enclosed within a sheath. Microwave signals are sent to the test head assemblies and therein frequency-multiplied ... | 09/08/1992 |
| 5115209 | Multiple YIG oscillator YIG oscillator apparatus comprises both an FET-based YIG oscillator circuit and a bipolar transistor-based YIG oscillator circuit inside a single magnetic structure. Both YIG spheres are disposed in the single air gap of the magnetic structure, which is d... | 05/19/1992 |
| 5113094 | Method and apparatus for increasing the high frequency sensitivity response of a sampler frequency converter A method and apparatus comprising a sampler frequency converter having a first and a second diode. A local oscillator having a frequency FLO, a step recovery diode and a balun transformer are used for providing positive and negative sampling pu... | 05/12/1992 |
| 5111165 | Microwave coupler and method of operating same utilizing forward coupling A suspended substrate coupler for operation at frequencies of 26 GHz or higher operated in a forward coupling mode. Coupling tends to improve with increased frequency and coupling as tight as 2 dB is provided for frequencies of 40 to 60 GHz. The first and... | 05/05/1992 |
| 5059915 | Vector network analyzer RF pulse profiling method and apparatus A vector network analyzer comprising a circuit for measuring the real and imaginary components of the central spectral line in an RF pulse from a device-under-test is provided. The circuit comprises a modulator in response to a profiling pulse for modulat... | 10/22/1991 |
| 5055807 | Method and apparatus for multiplexing broad band high frequency signals for use in network analyzers A method and apparatus for multiplexing broad band high frequency signals comprises a microwave coupler. A first source of signals is connected to the through-arm of the coupler and a second source of signals of higher frequency is connected to the coupli... | 10/08/1991 |
| 5053733 | Method and apparatus for multiplexing broad band high frequency signals for use in network analyzers A method and apparatus for multiplexing broad band high frequency signals using either a parallel line contra-directional microwave coupler or forward coupling microwave coupler. A first source of signals comprising multiple decades of frequencies below a... | 10/01/1991 |
| 5047737 | Directional coupler and termination for stripline and coaxial conductors A directional coupler having coupled striplines provided between ground planes includes dielectric layers having a dielectric constant greater than the dielectric constant of air interposed between the stripline conductors and each of the ground planes, t... | 09/10/1991 |
| 5019790 | Method for eliminating subharmonic false locking in sampler and frequency multiplier based source locking systems A method for eliminating subharmonic false locking in a sampler and frequency multiplier phase-locked-loop source locking system comprising the modification of a prior known algorithm for determining the frequency of the first local oscillator used for co... | 05/28/1991 |
| 5010544 | Fault location operating system with loopback A fault-location operating system for use with transmission networks using repeaters with loopback capabilities. A plurality of bidirectional transmission links Li, for i=1 through N, are used for transmission of data between the terminals. A t... | 04/23/1991 |
| 4995006 | Apparatus and method for low-pass equivalent processing Low pass equivalent processing is a method for use with a network analyzer, that gethers a sequence of NDATA samples, each sample including real and imaginary components of a signal, over a frequency range from F1 to f2 in frequency steps of (f2-f1)/(NDAT... | 02/19/1991 |
