Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 7538608 | Photonic crystal ribbon-beam traveling wave amplifier A RF amplifier includes a RF input section for receiving a RF input signal. At least one single-sided slow-wave structure is associated with the RF interaction section. An electron ribbon beam that interacts with the RF input supported by the at least one single-sid... | 05/26/2009 |
| 7368874 | Dynamic depressed collector A biasing system for use with a multi-stage depressed collector of a high power amplifier includes one or more adjustable power sources. A power controller provides control signals to the power sources depending on the operational RF power level. For low power appli... | 05/06/2008 |
| 7358803 | Broadband high efficiency traveling wave tube amplifier system A power control system for a satellite receiving radio-frequency signals includes a traveling wave tube amplifier system and corresponding traveling wave tube. An anode voltage of the traveling wave tube amplifier system is used to modulate or saturate the current o... | 04/15/2008 |
| 7315206 | Travelling-wave amplifier A traveling-wave amplifier includes amplifiers coupled anti-parallel to transmission lines. Phase(s) of the amplifiers provide phase matching, which may additionally or alternately be provided by couplers or spatial offset of the amplifiers and couplers. The traveli... | 01/01/2008 |
| 7245465 | Voltage regulator A voltage regulator has an output circuit for producing from an input voltage a predetermined output voltage to be supplied to a load, an overcurrent protection circuit for preventing overcurrent in the output circuit, a memory for storing control information fed fr... | 07/17/2007 |
| 7230480 | Estimating the operating point on a non-linear traveling wave tube amplifier A method, apparatus, article of manufacture, and a memory structure provide the ability to determine an input operating point and an output operating point on a non-linear traveling wave tube amplifier (TWTA). The non-linearity of the TWTA is measured. An input root... | 06/12/2007 |
| 7190108 | Methods and apparatus using pulsed and phased currents in parallel plates, including embodiments for electrical propulsion First and second parallel conducting plates include arrayed conducting segments, preferably with specific spacing relative to each other and to the separation of the plates. Currents through the conducting segments are pulsed and phased to produce constructive but u... | 03/13/2007 |
| 7151422 | 90° hybrid A 90° hybrid for splitting or interconnecting radio frequency power includes four gate connections, capacitances and inductances for electric capacitive coupling and magnetic inductive coupling, an arrangement of strip conductors that are disposed approximately par... | 12/19/2006 |
| 7142052 | Travelling wave amplifiers A traveling wave amplifier (TWA) comprising two or more amplification modules, the inputs of adjacent amplification modules being connected together by a first inductance component of a first characteristic impedance, a second inductance component of a second charac... | 11/28/2006 |
| 7138860 | System and method for envelope modulation A power control system for a satellite receiving radio-frequency signals includes a digital processor and a traveling wave tube amplifier system and corresponding traveling wave tube. An anode voltage of the traveling wave tube amplifier system is used to modulate o... | 11/21/2006 |
| 7071624 | Microwave tube system and microwave tube A microwave tube has a configuration in which the connection between an anode electrode and the helix is cut, the helix is grounded, and a current suppression element is provided between the anode electrode and ground voltage for suppressing the continuous time inte... | 07/04/2006 |
| 6921890 | Low-noise, crossed-field devices such as a microwave magnetron having an azimuthally-varying axial magnetic field and microwave oven utilizing same Cost-effective, simple, low-noise, crossed-field devices such as a microwave magnetron, a microwave oven utilizing same, and crossed-field amplifier utilize an azimuthally varying, axial magnetic field. The magnetic configuration reduces and eliminates microwave and... | 07/26/2005 |
| 6909235 | Power regulator for intermittent use of traveling wave tube amplifiers in communications satellites A traveling wave tube (TWT) amplifier includes a beam forming electrode (BFE) and a BFE modulator having a bias-based keyer so that the TWT amplifier signals are keyed off during periods when RF power is not to be amplified. Biasing the beam forming electrode voltag... | 06/21/2005 |
| 6906470 | Method and system for controlling electron beams from field emission cathodes Apparatus and method are provided for using a multi-element field emission cathode in a color cathode ray tube. The field emission cathode may have from four to ten field emission arrays linearly arranged. The arrays are preferably formed from carbon-based material.... | 06/14/2005 |
| 6903519 | Multi-element field emission cathode Apparatus and method are provided for using a multi-element field emission cathode in a color cathode ray tube. The field emission cathode may have from four to ten field emission arrays linearly arranged. The arrays are preferably formed from carbon-based material.... | 06/07/2005 |
| 6791408 | System and method for noise and spurious suppression in power amplifier systems An amplifier system is disclosed. The amplifier system includes a first amplifier, a second amplifier, and a phase noise suppression circuit. The first amplifier includes an input signal terminal and an output signal terminal. The second amplifier includes an input ... | 09/14/2004 |
| 6781454 | Linearized traveling wave tube circuit with pre-distortion linearizer A traveling wave tube assembly has a traveling wave tube and a predistortion network RF coupled and physically coupled to the traveling wave tube. The traveling wave tube and the predistortion network may be located in a high temperature zone. An amplifier located i... | 08/24/2004 |
| 6734734 | Amplifier phase droop and phase noise systems and methods A system includes a component having a signal input and a power supply input, wherein the power supply input is in communication with a power supply. The system also includes a voltage probe connected between the power supply input and the signal input, wherein the ... | 05/11/2004 |
| 6611719 | Cancer thermotherapy A given high frequency electric power introduced into a cavity resonator is resonated in the long direction of the cavity resonator on an excited mode with a constant electric field intensity along the long direction of the cavity resonator. Then, a human... | 08/26/2003 |
| 6590450 | System and method for linearizing vacuum electronic amplification An amplifier system including a vacuum tube amplifier having an input signal terminal, an output signal terminal, and an electron source, and a control circuit having an input terminal coupled to one of the input signal terminal and the output signal term... | 07/08/2003 |
| 6586883 | Method and apparatus for detecting individual TWT helix current for multiple TWT loads A method and apparatus to individually detect the cathode to helix current of multiple TWTs sharing a common cathode to helix voltage supplied by a single HV EPC, which provides the capability to determine which tube has exceeded the limit and to adequate... | 07/01/2003 |
| 6555964 | Device, notably for controlling a travelling-wave tube A power-supply device and amplifier are joined by way of a mechanical/thermal interface to form a unit. Electrical connections between the power-supply device and the amplifier chamber are run within this shared unit. A shared electrical interface is prov... | 04/29/2003 |
| 6498532 | System and method for linearizing vacuum electronic amplification An amplifier system. The amplifier system includes a vacuum tube amplifier, an electron source voltage modulation circuit, and a linearization circuit. The vacuum tube amplifier includes an input signal terminal and an output signal terminal. The electron... | 12/24/2002 |
| 6489842 | Multiple traveling wave tube amplifier electronic power conditioner with centralized low voltage and distributed high voltage A microwave tube system for use with a spacecraft telecommunication system is provided. The system includes a traveling wave tube subsystem, a high voltage converter subsystem, and a low voltage converter subsystem. The traveling wave tube subsystem inclu... | 12/03/2002 |
| 6486604 | Traveling-wave valve arrangement For a traveling-wave valve arrangement with a traveling-wave valve and a linearizing circuit arrangement, it is proposed to design the linearizing circuit arrangement and the traveling-wave valve as one constructional unit and, for the thermal protection ... | 11/26/2002 |
| 6462474 | Grooved multi-stage depressed collector for secondary electron suppression A linear beam device comprises a cathode and an anode spaced therefrom, with the anode and cathode being operable to form and accelerate an electron beam. An RF interaction region having a drift tube is arranged relative to the anode to permit the electro... | 10/08/2002 |
| 6459337 | System and method for noise and spurious suppression in power amplifier systems An amplifier system, including a vacuum tube amplifier having an input signal terminal and an output signal terminal, and a phase noise suppression circuit having first and second input terminals and an output terminal, wherein the first input terminal is... | 10/01/2002 |
| 6369511 | Travelling-wave tube amplifier A travelling-wave tube amplifier comprises a travelling-wave tube, a plurality of collector electrodes, a plurality of collector leads and at least one magnetic core. The travelling-wave tube causes interaction between an electron beam and an input high f... | 04/09/2002 |
| 6369648 | Linear traveling wave tube amplifier utilizing input drive limiter for optimization A linearized traveling wave tube amplifier with average power limiter is disclosed. The device includes an average power limiter for the purpose of preventing a TWT from operating at output powers higher than the required operating point. The device inclu... | 04/09/2002 |
| 6360084 | Dual-band RF power tube with shared collector and associated method An RF transmitter, such as a radar transmitter or a communications amplifier, is provided that includes a plurality of RF power tube sections each sharing a common collector. The RF tube sections may comprise Klystron tubes, TWT tubes or other RF power tu... | 03/19/2002 |
| 6353525 | Arrangement in a power unit for a grid-pulsed, O-type microwave tube A power unit for a grid pulsed O-type microwave tube (1) having a cathode (2) and a collector (3), comprises a cathode unit (5) and a collector unit (6), each having two output terminals (7, 8; 9, 10). A first and a second capacitor (C1, C2) are connected... | 03/05/2002 |
| 6346853 | Predistortion linearizer circuit A predistortion linearizer circuit comprising an amplitude distorting part (AM/AM) and a phase distorting part (AM/PM). At least the phase distorting part (AM/PM) comprises broadband biasing means (51) and a non-linear transmission line (L51/D51 to L55/D5... | 02/12/2002 |
| 6177836 | Feed forward linearized traveling wave tube A feed-forward linearization of a traveling wave tube amplifier linearizes the transfer function of the tube through a linearization voltage derived at baseband from the instantaneous amplitude of the input signal to control the cathode voltage causing in... | 01/23/2001 |
| 6049249 | TWT with mismatched section for controlled gain variation with frequency Apparatus compensating for gain variations versus frequency of a traveling wave tube (TWT) is disclosed. The apparatus provides an RF interaction circuit section designed with specified mismatches causing internal reflections of the RF waves, such that th... | 04/11/2000 |
| 5940025 | Noise cancellation method and apparatus A radar transmitter for producing a radar signal in response to a radar trigger signal fed thereto. The transmitter includes a radio frequency oscillator for producing a signal having a radio frequency carrier to be used in each transmitted radar signal. ... | 08/17/1999 |
| 5862462 | Power enhancement techniques for high power satellites A satellite is formed with a signal translation and amplification system which includes at least one communication path. Each communication path includes a plurality of radiation-cooled TWTs powered by a single EPC. Also included in the communication path... | 01/19/1999 |
| 5838195 | Reduction of second order harmonic distortion in high power TWT amplifiers Second harmonic distortion of a traveling wave tube amplifier with a bandwidth exceeding one octave is efficiently minimized by generating a low-power second harmonic signal, modifying it by an adaptive filter, and adding the modified second harmonic sign... | 11/17/1998 |
| 5834971 | RF amplifier including traveling wave tube with sequential stages Multiple gain stages are provided in a single traveling wave tube amplifier (TWTA). Each gain stage comprises an interaction circuit, an associated RF input, and an associated RF output. The gain stages are separated by a drift length that is selected to ... | 11/10/1998 |
| 5789978 | Ku-band linearizer bridge A Ku-band integrated pre-distortion type linearizer bridge circuit for use in linearizing the performance of a traveling wave tube amplifier. The linearizer bridge circuit comprises linearizer bridge that embodies a phase shifter and a fixed delay in a li... | 08/04/1998 |
| 5773933 | Broadband traveling wave amplifier with an input stripline cathode and an output stripline anode A broadband, traveling wave amplifier which includes a target anode and an lectron gun for bombarding the anode with an electron beam having an amplitude proportional to that of an input signal. The electron gun includes a NEA semiconductor cold cathode ha... | 06/30/1998 |
