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| Number | Title | Issue Date |
| 7474148 | Amplifier comprising an electronic tube provided with collectors biased by at least two DC bias sources An amplifier including an electronic tube with an axial electron beam, provided with a cathode and at least two collectors, and at least two sources of DC voltage. Each collector is connected to a DC voltage source having a potential difference such that, the furthe... | 01/06/2009 |
| 7145297 | L-band inductive output tube An inductive output tube (IOT) operates in a frequency range above 1000 MHz. An output window may be provided to separate a vacuum portion of the IOT from an atmospheric pressure portion of the IOT, the output window being surrounded by a cooling air manifold, the m... | 12/05/2006 |
| 7129504 | Method and apparatus for generation and frequency tuning of modulated, high current electron beams Generating and frequency tuning of modulated high current electron beams and a specific efficient, high current, frequency-tunable device for generating intense radio frequency (RF), microwave electromagnetic fields in a rectangular waveguide. Current multiplication... | 10/31/2006 |
| 6998783 | Inductive output tube having a broadband impedance circuit An inductive output tube (IOT) provides improved efficiency and larger bandwidth. In one embodiment, an IOT is provided with an electron gun that generates an electron beam, a tube body, a collector for collecting the electron beam, and an extended-interaction outpu... | 02/14/2006 |
| 6879208 | Multi-stage collector having electrode stages isolated by a distributed bypass capacitor In a multistage collector used in a linear beam tube such as an IOT or klystron, electrode stages are separated by ceramic rings having metallised surfaces to provide distributed bypass capacitors. This eliminates or reduces leakage or any radio frequency energy fro... | 04/12/2005 |
| 6838829 | Depressed collector for electron beams A depressed collector for recovery of spent beam energy from electromagnetic sources emitting sheet or large aspect ration annular electron beams operating aver a broad range of beam voltages and currents. The collector incorporates a trap for capturing and preventi... | 01/04/2005 |
| 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 |
| 6380803 | Linear amplifier having discrete resonant circuit elements and providing near-constant efficiency across a wide range of output power A linear amplifier comprises an electron gun assembly having a cathode, and an anode spaced from the cathode. A relatively high voltage potential is applied between the anode and the cathode, and the cathode provides an electron beam in response to the re... | 04/30/2002 |
| 6300715 | Very high power radiofrequency generator The disclosure relates to a radiofrequency generator including an Inductive Output Tube with an electron gun followed by an anode, the gun being raised to a high voltage in use, means producing an input radiofrequency signal and means of transmitting it t... | 10/09/2001 |
| 6191651 | Inductive output amplifier output cavity structure A signal output assembly for an inductive output amplifier comprises a primary output cavity including a drift tube enclosing a modulated electron beam. The density modulated beam passes across a gap separating portions of the drift tube and induces an am... | 02/20/2001 |
| 6163112 | Device for quick frequency tuning of a microwave tube using a direct sensing means A frequency tuning device for a microwave tube. The tube has one or more resonant cavities which are tuned with the aid of a movable tuning element for each cavity. Each tuning element has an actuating device and a sensor which detects the position of the... | 12/19/2000 |
| 6133786 | Low impedance grid-anode interaction region for an inductive output amplifier A linear beam amplification device includes an axially centered electron emitting cathode and an anode spaced therefrom. The cathode provides an electron beam in response to a relatively high voltage potential defined between the cathode and the anode. A ... | 10/17/2000 |
| 5990621 | Electron beam tubes including ceramic material for realizing rf chokes A linear electron beam tube such as an IOT includes an input cavity formed from an inner body portion and an outer body portion which are joined together by a ceramic cylinder. The input cavity surrounds an electron gun and permits electrical connection t... | 11/23/1999 |
| 5773934 | Resistive wall klystron amplifier having grounded drift tube Nonlinear current modulation of a relativistic electron beam is achieved by ts propagation without interruption through a resistive wall type of drift tube assembly within a klystron amplifier. Maximized beam current modulation is thereby attained for a be... | 06/30/1998 |
| 5726533 | Cathode ray tube having an input resonator cavity The invention relates to a cathode ray tube having an input resonator cavity which includes a first metal wall (2) and, spaced apart therefrom, a second metal wall (3) each conveying a low electric potential and constituting coupling areas (6, 7) at axial... | 03/10/1998 |
| 5698949 | Hollow beam electron tube having TM0x0 resonators, where X is greater than 1 An inductive output tube, e.g., a KLYSTRODE, or a klystron, has a substantially hollow electron beam traversing a resonant cavity excited to the TM0x0 mode, where x is greater than 1.... | 12/16/1997 |
| 5691667 | RF radiation absorbing material disposed between the cathode and anode of an electron beam tube An r.f. radiation absorbing material able to hold off a 30 to 40 kV voltage difference is described as formed by a silicon rubber loaded with ferrite particles. The material is used to reduce self-oscillation in amplifiers.... | 11/25/1997 |
| 5682084 | Grid electron tube with a folded cavity structure An electron tube includes cylindrical electrodes which are mounted coaxially. The electrodes include a cathode surrounded by a grid, with the cathode and the grid defining an input resonant cavity having an active zone. The cavity extends on both sides of... | 10/28/1997 |
| 5650751 | Inductive output tube with multistage depressed collector electrodes providing a near-constant efficiency A high efficiency linear amplifier comprises an electron gun assembly having a cathode and an anode, the cathode being operable at a relatively high voltage potential relative to the anode to form and accelerate an electron beam. A control grid is dispose... | 07/22/1997 |
| 5606221 | Electron beam tubes having a resonant cavity with high frequency absorbing material In an electron beam tube, such as an IOT, ferrite loaded silicone rubber or some other ferrite loaded dielectric material, is carried by a wall of an input cavity. The material absorbs r.f. energy, reducing coupling between different parts of the tube whi... | 02/25/1997 |
| 5581154 | Resistive wall klystron amplifier Nonlinear current modulation of a relativistic electron beam is achieved by ts propagation without interruption through a resistive wall type of drift tube assembly within a klystron amplifier. Maximized beam current modulation is thereby attained for a be... | 12/03/1996 |
| 5581153 | Electron beam tube having resonant cavity circuit with selectively adjustable coupling arrangement An electron beam tube arrangement in an inductive output tetrode. The arrangement comprises a resonant cavity circuit having two cavities, and includes an element for coupling high frequency energy between the two cavities. The coupling element includes a... | 12/03/1996 |
| 5548245 | Electron beam tube arrangements having the input cavity comprised of electrically internal and external body portions A linear electron beam tube has voltages provided thereto, an electron gun, and an output resonant cavity operatively arranged together. An internal body portion, an external body portion and an insulating portion are provided. The internal body portion, ... | 08/20/1996 |
| 5536992 | Linear electron beam tubes arrangements An inductive output tetrode includes a cylindrical ceramic envelope within which is located an electron gun including a cathode and grid. An annular resonant input cavity into which a high frequency signal is coupled surrounds the envelope and is located ... | 07/16/1996 |
| 5534820 | Compensating for non-linear effects in signal processing with active devices In signal processing circuitry using active devices, non-linearity of the device causes distortion of pure tones and the generation of intermodulation products for more complex signals. The transfer characteristics of such active devices may be considered... | 07/09/1996 |
| 5521551 | Method for suppressing second and higher harmonic power generation in klystrons A method for suppressing second and higher harmonic power generation in a klystron is described. The klystron includes a series of cavities that are connected to a series of connecting drift tubes, and one or more waveguide loads are placed on selected on... | 05/28/1996 |
| 5402085 | Process and device for compensation of phase instabilities of the wave amplified by a microwave tube The voltage variation between the electrodes of the tube of a microwave amplifier (1) causing a phase Shift of the output wave from the microwave amplifier (1), the process according to the invention consists of creating a phase shift of the wave entering... | 03/28/1995 |
| 5386177 | Plasma klystron amplifier A body of dense plasma is established within a short drift tube of a klysn amplifier between input and output resonator cavities thereof to support current modulation of microwave energy by interaction with an electron beam propagated through the drift t... | 01/31/1995 |
| 5355093 | Compact microwave and millimeter wave amplifier An electronic device for amplifying microwave or millimeter wave signals. A microwave or millimeter wave input signal stimulates a gated field emission array to produce a density modulated beam of electrons containing about 1 billion to 1,000 billion bunc... | 10/11/1994 |
| 5304942 | Extended interaction output circuit for a broad band relativistic klystron An extended interaction output circuit interacts with a modulated electron beam and outputs RF electromagnetic energy. The circuit comprises a plurality of linearly disposed cavities each having a gap permitting the traveling therethrough of the modulated... | 04/19/1994 |
| 5283534 | High frequency amplifying apparatus with a collector which has a periodic amplitude variable longitudinal magnetic field therein In a klystron, or other device which uses modulation of an electron beam to produce amplification of an applied high frequency signal, a collector is used to receive electrons of the beam after the amplified signal has been coupled from the device. Any se... | 02/01/1994 |
| 5281923 | Amplifying arrangements which modulate an electron beam An amplifying arrangement employs both density and velocity modulation of an electron beam in order to produce amplification of a high frequency signal. In one embodiment, density modulation is produced at the cathode region, a first carrier signal being ... | 01/25/1994 |
| 5239272 | Electron beam tube arrangements having primary and secondary output cavities An electron beam tube arrangement has an output cavity resonator circuit which includes a first output cavity, a second output cavity being coupled thereto by means of a coupling loop. The coupling loop is located in the first cavity and connected to said... | 08/24/1993 |
| 5162747 | Velocity modulation microwave amplifier with multiple band interaction structures Two or more signal interaction structures (16,18), which may be klystron or traveling wave structures (32,50), are axially disposed in series between an electron gun (12) and a collector (14) for selectively velocity modulating an electron beam (20) gener... | 11/10/1992 |
| 5132638 | High power klystron amplifier A klystron amplifier in which the drift tube is in the form of a casing and a central member disposed coaxially about the same centerline to form a coaxial space between the central member and the casing which runs parallel to the centerline, and through ... | 07/21/1992 |
| 5124664 | Field emission devices A klystron device comprises an array of cold-cathode field emission elements arranged to form a distributed amplifier which further comprises a modulation strip line and a catcher strip line. A collector electrode is spaced from the catcher strip line. Th... | 06/23/1992 |
| 5065109 | Electropneumatic band selector A band selector for a klystron includes a cam carrier and a plurality of cam followers. The cam carrier includes a plurality of cams with the cams being arranged in a plurality of rows. Each of the cam followers has a first end adapted to be mounted to a ... | 11/12/1991 |
| 4931695 | High performance extended interaction output circuit There is provided a high performance extended interaction output circuit [EIOC] having two cavities. The EIOC of the present invention has an image impedance which is twice the magnitude of its output load resistance. The EIOC of the present invention als... | 06/05/1990 |
| 4908549 | Motor-driven device for preadjusted frequency tunings for a klystron A klystron comprises a plurality of resonant cavities, the frequency of which is defined by a piston within each cavity. In order to change the frequency of the klystron, each piston is provided with a rod applied against an adjusting screw under the pres... | 03/13/1990 |
| 4820996 | Amplifying arrangements An amplifying arrangement includes a klystron in which an electron beam interacts with a high frequency signal to produce a modulated amplified signal. The high frequency signal is maintained at a substantially constant amplitude and modulation of the amp... | 04/11/1989 |
