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| Number | Title | Issue Date |
| 7347101 | Measuring strain in a structure using a sensor having an electromagnetic resonator The system (10) comprises a sensor (18) 90×90×90×30 mm as an electromagnetic microwave cavity (20) with a coupler (22) with a wire (40) and an antenna (42). Cavity (20) produces a response signal (26) in res... | 03/25/2008 |
| 7260279 | Integrated opto-electronic oscillators Integrated opto-electronic oscillators that use micro resonators in the optical section of the opto-electronic feedback loop. ... | 08/21/2007 |
| 7227360 | Phased array MRI coil with controllable coupled ring resonator A coil for magnetic resonance imaging operates in a transmit mode with multiple loops locked together in a phase relationship like a birdcage coil to provide a uniform transmission field, but in a receive mode like a phased array coil, each coil operating independen... | 06/05/2007 |
| 7177781 | Method and system for electron density measurement The present invention provides a diagnostic system for plasma processing, wherein the diagnostic system comprises a multi-modal resonator, a power source, a detector, and a controller. The controller is coupled to the power source and the detector and it is configur... | 02/13/2007 |
| 7173749 | Opto-electronic feedback for stabilizing oscillators This application describes use of an opto-electronic feedback in oscillators to suppress phase noise based on the high Q factor of the opto-electronic feedback. ... | 02/06/2007 |
| 7139535 | Signal processing of an amplitude-modulated and/or phase-modulated high-frequency signal The invention indicates a method for signal processing of an amplitude-modulated and/or phase-modulated high-frequency signal (RF signal), in which the RF signal is broken down into two signals (FM1 and FM2) by relative phase displacement by an angle +β and −β a... | 11/21/2006 |
| 7109917 | Intergrated semiconductor component for high-frequency measurement and use thereof It is provided that the semiconductor component is a component of a semiconductor circuit (10) comprising a first silicon layer (12), an adjoining silicon dioxide layer (insulating layer (14)) and a subsequent further silicon layer (structured l... | 09/19/2006 |
| 7006542 | System and method for stabilizing a laser output frequency A system and method for stabilizing the frequency of the optical output signal of a laser wherein the laser output signal is interfered with at least one time delayed version of said signal to produce an optical interference signal having a frequency shift proportio... | 02/28/2006 |
| 6946919 | Controllable crystal oscillator component A frequency-adjustable oscillator suitable for digital signal clock synchronization comprises a crystal oscillator circuit for generating a driving signal and having a voltage-variable control input for adjusting a frequency of the driving signal, a phase detector c... | 09/20/2005 |
| 6133795 | Oscillator circuit A stabilised voltage controlled oscillator circuit comprises a closed loop circuit containing a voltage controlled oscillator (34), a local oscillator (40) and a harmonic mixer (38) that mixes a stabilised local oscillator (LO) frequency signal and a radi... | 10/17/2000 |
| 6078223 | Discriminator stabilized superconductor/ferroelectric thin film local oscillator A tunable local oscillator (10) with a tunable circuit (12) that includes a resonator (16) and a transistor (14) as an active element for oscillation. Tuning of the circuit (12) is achieved with an externally applied dc bias (22, 24) across coupled lines ... | 06/20/2000 |
| 5949290 | Voltage controlled oscillator tuning apparatus and method A 1-port tunable frequency discriminator that is incorporated into a frequency lock loop (FLL) for providing an improved FLL having reduced phase noise and settling times is provided. The invented 1-port tunable delay line discriminator reduces the phase ... | 09/07/1999 |
| 5912926 | Method of and apparatus for controlling modulation of digital signals in frequency modulated transmissions A programmable apparatus is disclosed for generating a frequency modulated signal at a selected center frequency in accordance with digital data of at least first and second data levels. The modulating apparatus comprises a modulator having an input and a... | 06/15/1999 |
| 5847620 | Dielectric resonator phase shifting frequency discriminator A dielectric resonator frequency discriminator comprising a microstrip, a single mode dielectric resonator coupled to the microstrip, at least one detector for detecting an RF signal coupled to the microstrip and an RF input for introducing an RF signal c... | 12/08/1998 |
| 5661439 | Method and apparatus for cancelling phase noise A frequency oscillator and a frequency multiplier multiplying the signals from the oscillator contain inherent phase noise. A phase noise canceller removes phase noise, due to both the oscillator and the multiplier, by inserting a delay in one path and co... | 08/26/1997 |
| 5587690 | Ring resonator oscillator usable in frequency synthesizers and communication apparatus A first oscillator includes: a ring resonator; an oscillation circuit having a negative resistance active circuit coupled to a first point on the ring resonator for oscillating at an oscillation frequency and resonating the resonator; an output terminal, ... | 12/24/1996 |
| 5294895 | Microwave oscillators and transmitters with frequency stabilization In addition to a first opening (11) forming a primary output from a waveguide cavity (10) of a microwave oscillator, a coupling aperture (12) in a reflective wall (32) provides a secondary output which does not degrade the performance or tuning characteri... | 03/15/1994 |
| 5220292 | Microwave oscillator with noise degeneration feedback circuit A microwave oscillator is shown to include an oscillator having an output and a control port and a feedback circuit disposed between the output and the control port of the oscillator. The feedback circuit includes a modulated laser, having an input and an... | 06/15/1993 |
| 5204640 | Widely tunable oscillator stabilization using analog fiber optic delay line A circuit for stabilizing an oscillator having an oscillator output signal includes a long optical fiber delay line which receives an optical version of the oscillator output signal and a phase detector sensing the oscillator output signal and the delayed... | 04/20/1993 |
| 5081424 | Unequal stub length diplexing microwave frequency discriminator circuit A microwave frequency discriminator circuit useful as a frequency lineariion device includes a microstrip input conductor and a pair of microstrip output conductors, a pair of resistors, a pair of microstrip transmission line diplexer stubs of unequal le... | 01/14/1992 |
| 4961058 | Feedback stabilization loop Stabilizing a signal generating source by coupling a small amount of the output power through a bandpass filter tuned to the desired frequency and injecting the power back into the source. In another embodiment the filtered power may be increased by injec... | 10/02/1990 |
| 4925302 | Frequency locking device An improved frequency locking circuit suitable for indirectly locking an optical frequency f0 to a radio frequency f1 or of locking the radio frequency to the optical frequency. A beam of optical frequency f0 is modulated ... | 05/15/1990 |
| 4862108 | Frequency locking circuit with sideband imbalance correction Circuit imperfections in phase modulators will introduce offsets in the servo error signals in frequency locking circuits. Such offsets will also cause a frequency offset. The frequency offset is first reduced by reducing or removing amplitude modulation ... | 08/29/1989 |
| 4855691 | Amplitude stabilizer for use in microwave discriminator A microwave frequency discriminator, i.e. an electronic device for directly transforming frequency modulation on a microwave carrier into a demodulated lower frequency signal. The discriminator is similar to a Travis discriminator and includes an inlet mi... | 08/08/1989 |
| 4780691 | Dielectric resonator frequency discriminator for stabilizing oscillator frequency A frequency discriminator (1) stabilizes a voltage controlled oscillator (5), particularly one operating at microwave frequencies. A single dielectric resonator (2), typically positioned within a housing (8), is excited by an r.f. input (30). The dielectr... | 10/25/1988 |
| 4746878 | C. W. laser wavemeter/frequency locking technique A wavemeter/frequency locking technique suitable for indirectly locking an optical frequency f0 to a radio frequency f1 or for locking the radio frequency to the optical frequency. A beam of optical frequency f0 is phase m... | 05/24/1988 |
| 4694260 | Microwave discriminator and devices using said discriminator A microwave frequency discriminator, i.e. an electronic device for directly transforming frequency modulation on a microwave carrier into a demodulated lower frequency signal. The discriminator is similar to a Travis discriminator and includes an inlet mi... | 09/15/1987 |
| 4656394 | Particle accelerator with frequency correction A particle accelerator with frequency correction is provided in which an electromagnetic wave, supplied by a generator, is injected into a cavity through a wave guide. A frequency corrector device comprises two non directional couplers taking directly fro... | 04/07/1987 |
| 4644296 | Controlling oscillator A voltage controlled oscillator includes a VCO chip that is a monolithic circuit with a Gunn diode and varactor diode intercoupled by a resonant circuit. A detector/discriminator/power divider chip is coupled to the VCO chip through a directional coupler ... | 02/17/1987 |
| 4631498 | CW Laser wavemeter/frequency locking technique A wavemeter/frequency locking technique suitable for indirectly locking an optical frequency f0 to a radio frequency f1 or for locking the radio frequency to the optical frequency. A beam of optical frequency f0 is phase m... | 12/23/1986 |
| 4426732 | Receiver having a surface elastic wave high frequency amplifier with a frequency-controlled pump oscillator Receiver comprising at least two output means taking out electric signals corresponding to sound waves propagating in different directions in a surface elastic wave amplifier disposed in the high frequency amplifier stage, wherein phase difference or freq... | 01/17/1984 |
| 4387347 | Delay line frequency discriminator for stabilizing an oscillator A delay line frequency discriminator having application to microwave equipment and particularly used for stabilizing an oscillator, including a first coupler supplied by the oscillator and connected to a second coupler by means of two electromagnetic tran... | 06/07/1983 |
| 4243949 | Frequency stabilization technique for microstrip oscillators An apparatus for frequency stabilizing a microstrip oscillator using an integrated diplexer as a frequency discriminator. The crossover frequency of the microstrip diplexer is used in a feedback arrangement to stabilize a millimeter-wave oscillator. The d... | 01/06/1981 |
| 4196398 | Regulation of a plurality of superconducting resonators In order to maintain a plurality of superconducting resonators, each having elastically deformable resonant structural elements, at the same natural frequency and phase position, each resonator is supplied with high frequency power independently of the ot... | 04/01/1980 |
| 4127819 | Frequency discriminator apparatus A frequency discriminator having a bandwidth variable from a relatively narrow range to a very wide range in which the center frequency is simultaneously tunable over an extremely wide frequency range. The discriminator is insensitive to amplitude variati... | 11/28/1978 |
| 4122408 | Frequency stabilization utilizing multiple modulation A system and method is disclosed for achieving frequency stabilization. A tunable element, such as a cavity structure, is stabilized through the use of multiple modulation to stabilize both the resonant frequency of the cavity structure and the probe sign... | 10/24/1978 |
| 4121173 | Arrangement for automatically controlling the frequency of a hyperfrequency generator feeding a resonant element subjected to fluctuations in temperature An arrangement enables the frequency variation of a resonant element (an accelerating section for example) to be followed in dependence upon its temperature and the frequency of the hyperfrequency generator G feeding this resonant element Q to be controll... | 10/17/1978 |
| 4084128 | Demodulator for phase reversal modulation system 1. A receiver for use in a PSK signal translation system comprising a voltage tunable local oscillator for continuously generating a reference frequency signal from which the suppressed carrier can be reconstructed, input signal means for an incoming PSK ... | 04/11/1978 |
| 4048580 | Apparatus for detecting a stable microwave discrete frequency An input signal, whose frequency is to be detected, is divided and sent i two arms. One arm applies a set phase and amplitude adjustment while the other arm has a phase response that is dependent upon the frequency. Both arms are fed to a phase detector ... | 09/13/1977 |
| 4042891 | Frequency synthesizer having frequency control loop including fiber optic delay line A frequency synthesizer or programmable multiple frequency source which uses a voltage-controlled oscillator (VCO) responsive to an independent control variable. The VCO is also responsive to control from an error loop circuit which derives an additional ... | 08/16/1977 |
