Did You Know...
...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7356309 | Directional coupler for communication system An improved directional coupler that significantly reduces the signal degradation problems associated with distortion caused by circuit elements used to measure the transmitted power. In a selected embodiment, the directional coupler of the present invention compris... | 04/08/2008 |
| 7072636 | Printed circuit doubly balanced mixer for upconverter A doubly balanced upconverter mixer includes a local oscillator balun circuit comprising juxtaposed foil elements on opposite sides of an insulated substrate with electrical interconnections between the foil elements. An IF balun circuit also comprises series tuned ... | 07/04/2006 |
| 6957055 | Double balanced FET mixer with high IP3 and IF response down to DC levels A double balanced FET mixer that has a high third order intercept point and an intermediate frequency response that goes to direct current levels. The mixer includes a local oscillator terminal, a RF terminal and an intermediate frequency terminal. The mixer has a p... | 10/18/2005 |
| 6400774 | Nonlinearity-caused distortion compensating system A radio transmitter has a quadrature modulating portion and an RF power amplifier. The RF power amplifier follows the quadrature modulating portion. A nonlinearity-caused distortion compensating system provided in the radio transmitter includes a power ca... | 06/04/2002 |
| 6046631 | Detector coupled to transmission line by microstrip line The present invention provides a detector comprising a microstrip line having one end being grounded and another end connected to a main transmission line, a detection diode connected to the microstrip line, and a smoothing circuit for smoothing a signal ... | 04/04/2000 |
| 5745017 | Thick film construct for quadrature translation of RF signals A thick film construct and quadrature coupler for use in fabricating devices such as IQ modulators, IQ demodulators, vector modulators, image reject mixers, and multi-channel mixers. The thick film construct includes a dielectric substrate base with a met... | 04/28/1998 |
| 5561403 | Oscillator and modulator arrangements on a circuit board A printed circuit board includes an oscillator and a modulator. The oscillator includes a first printed inductor and a capacitive diode which are printed on one side of the printed circuit board. The modulator includes a second printed inductor coupled to... | 10/01/1996 |
| 5448501 | Electronic life detection system The invention relates to an electronic life detection system, in particular for the searching for buried persons and the surveillance of buildings, having a microwave transmitting/receiving device for generating and radiating microwaves into an area to be... | 09/05/1995 |
| 5416449 | Modulator with harmonic mixers An improved modulator circuit for mixing a modulation signal with a carrier signal includes first and second harmonic mixers which are operative to produce modulated output signals at an output frequency corresponding to both the sum and the difference of... | 05/16/1995 |
| 5006811 | Dual quadrature frequency converter A method and apparatus for modulating or demodulating a radio frequency (RF) signal which incorporates a pair of quadrature couplers. In demodulating an RF signal, an LO signal and the RF signal are each phase shifted -90 degrees by the couplers. The RF a... | 04/09/1991 |
| 4885483 | Logarithmic amplifier Logarithmic amplifiers which have a logarithmic transfer characteristic may be used in microwave instrumentation. Such an amplifier includes a series of MESFET distributed amplifiers (DA1-DA8) connected in cascade, with each of the MESFET distributed ampl... | 12/05/1989 |
| 4835498 | Tunable microwave filtering device with dielectric resonator, and applications A tunable, microwave filtering device comprises a microstrip line, a dielectric resonator capable of being coupled to the microstrip line, a coplanar line capable of being coupled to the resonator, an active element, such as a varactor for example, mounte... | 05/30/1989 |
| 4789840 | Integrated capacitance structures in microwave finline devices A finline structure comprises a dielectric substrate-mounted circuit disposed within a waveguide having on the substrate integrated distributed capacitance elements at least partially formed by laterally separated metallization layers. Thin-film construct... | 12/06/1988 |
| 4594557 | Traveling wave video detector A traveling wave video detector utilizing microwave integrated circuit techniques provides increased dynamic range, increased rf bandwidth up to 100 Ghz and improved impedance matching at high input power levels. The video detector comprises an artificial... | 06/10/1986 |
| 4425549 | Fin line circuit for detecting R.F. wave signals A fin line apparatus, within a rectangular waveguide, for detecting R.F. signals utilizes metallic film conductors, disposed on both surfaces of a planar dielectric centered in the waveguide parallel to its sidewalls, for forming aligned channels, a first... | 01/10/1984 |
| 4306235 | Multiple frequency microwave antenna A microwave antenna for use at a limited number of non-harmonically related frequencies, particularly two, includes a pair of reflectors, a detector diode, and a modulator diode mounted on a waveguide in operative spatial relationships which are compromis... | 12/15/1981 |
| 4118598 | Amplitude modulated impatt diode oscillator and a low cost communication system using same A low cost microwave communication system is described in which a transmitter including an IMPATT diode operating CW (Continuous Wave) is amplitude modulated by a video signal such that the radiated RF (radio frequency) output from the transmitter is dire... | 10/03/1978 |
| 4006425 | Dielectric image guide integrated mixer/detector circuit Disclosed is a dielectric image guide integrated circuit including first and second sections of image guide of preselected cross-sectional areas joined by an image guide transition section of variable cross-sectional area and all mounted on the surface of... | 02/01/1977 |
