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| Number | Title | Issue Date |
| 8179048 | High frequency helical amplifier and oscillator Disclosed herein is a class of mm and sub mm wavelength amplifiers and oscillators operating with miniature helical slow wave circuits manufactured using micro fabrication technology. The helices are supported by diamond dielectric support rods. Diamond is the best ... | 05/15/2012 |
| 8154206 | Portable microwave plasma generator capable of generating plasma with low electric power There is provided a small-sized portable microwave plasma generator capable of generating plasma at atmospheric pressure with low electric power including a coaxial cable, an outer conductor, a connection conductor, and a connection member. The coaxial cable include... | 04/10/2012 |
| 7719196 | Structure of coaxial-to-waveguide transition and traveling wave tube The present invention includes a waveguide for outputting radio frequency wave, a vacuum envelope provided with a slow-wave circuit, a coaxial connection part connecting the waveguide and the vacuum envelope, an insulating window member which is provided in the coax... | 05/18/2010 |
| 7605542 | Light-emitting device A light-emitting device, includes: an emitter sealed with a gas emitting light caused by a microwave; a high frequency power supply section including a diamond SAW oscillator and outputting a high frequency signal being output from the diamond SAW oscillator to a su... | 10/20/2009 |
| 7589469 | Coaxial waveguide converter circuit for traveling-wave tube, method of manufacturing same, and waveguide matching part for use in coaxial waveguide converter circuit A coaxial waveguide converter circuit is provided for converting an input/output coaxial section of a traveling-wave tube to a waveguide. The circuit comprises a waveguide matching part for connecting an inner conductor of the coaxial section extending into the wave... | 09/15/2009 |
| 7394201 | Field emission cathode gating for RF electron guns and planar focusing cathodes A novel method of gating electron emission from field-emitter cathodes for radio frequency (RF) electrode guns and a novel cathode that provides a focused electron beam without the need for magnetic fields or a curved cathode surface are provided. The phase and stre... | 07/01/2008 |
| 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 |
| 7265360 | Magnetron anode design for short wavelength operation An electromagnetic radiation source is disclosed. The electromagnetic radiation source includes an anode having a first conductor, a second conductor positioned relative to the first conductor, a plurality of pole pieces coupled to at least one of the first conducto... | 09/04/2007 |
| 7230384 | Robust RF interface in a TWT Apparatus and methods provide a robust radio frequency (RF) interface for a helix-type traveling wave tube (TWT). As a vacuum device, the RF input to the TWT and the RF output from the TWT are sealed to maintain the vacuum. The disclosed robust RF interface techniqu... | 06/12/2007 |
| 7164234 | High-power microwave system employing a phase-locked array of inexpensive commercial magnetrons A high-power microwave generator employing a plurality of inexpensive commercial magnetron tubes cross-coupled by means of a secondary coupling path between each magnetron output pair, whereby a portion of the output energy from a first magnetron tube is injected in... | 01/16/2007 |
| 7148778 | High performance hybrid magnetic structure for biotechnology applications The present disclosure provides a high performance hybrid magnetic structure made from a combination of permanent magnets and ferromagnetic pole materials which are assembled in a predetermined array. The hybrid magnetic structure provides for separation and other b... | 12/12/2006 |
| 7067980 | Shinged structures for vacuum microelectronics and methods of manufacturing same An improved Klystron device is disclosed which has opposed electrostatic (ES) magnetic field generating members which are uniformly spaced along a longitudinal axis to form an electron beam chamber. The ES magnetic field generating members produce a magnetic flux wh... | 06/27/2006 |
| 7026761 | Magnetrons A magnetron includes a decoupling plate located between the end hat of the magnetron cathode and an output coupling member. The use of the decoupling plate presents a high impedance and gives a resonant circuit which is arranged to be resonant at the operating frequ... | 04/11/2006 |
| 6987361 | Field emission cathode gating for RF electron guns and planar focusing cathodes A novel method of gating electron emission from field-emitter cathodes for radio frequency (RF) electrode guns and a novel cathode that provides a focused electron beam without the need for magnetic fields or a curved cathode surface are provided. The phase and stre... | 01/17/2006 |
| 6987360 | Backward wave coupler for sub-millimeter waves in a traveling wave tube A slow wave structure for coupling RF energy with an electron beam comprises a co-propagating RF section including a plurality of pins having a uniform separation from the plane of an electron beam axis. An output aperture is positioned a half wavelength from a refl... | 01/17/2006 |
| 6975499 | Vacuum variable capacitor with energization and heat shielding bellows A vacuum variable capacitor includes an energization bellows arranged in a vacuum vessel and having ends mounted to a movable-electrode support plate and a movable side-end plate, respectively, a heat shielding bellows arranged inside the energization bellows and ou... | 12/13/2005 |
| 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 |
| 6917162 | Traveling wave tube A slow wave circuit (10, 110) of a traveling wave tube includes a three-dimensional conductive structure (30, 130). A dielectric film (36, 136) coats selected portions of the three-dimensional conductive structure (30, 130). An outer hous... | 07/12/2005 |
| 6914556 | Method and apparatus for magnetron coherence A pulsed magnetron is caused to emit a series of RF energy pulses which are phase coherent with an injection signal by supplying the magnetron with a pedestal pulse during low-power signal injection. The pedestal being of a magnitude and duration such that the slow-... | 07/05/2005 |
| 6914441 | Detection of defects in patterned substrates One embodiment of the present invention is a method of detecting defects in a patterned substrate, including: (a) positioning a charged-particle-beam optical column relative to a patterned substrate, the charged-particle-beam optical column having a field of view (F... | 07/05/2005 |
| 6747412 | Traveling wave tube and method of manufacture A traveling wave tube includes a glass or other insulating envelope having a plurality of substantially parallel glass rods supported therewithin which in turn support an electron gun, a collector and an intermediate slow wave structure. The slow wave structure itse... | 06/08/2004 |
| 6727651 | Traveling wave tube Insulating ceramic parts for insulating collector electrodes in a traveling wave tube and a vacuum envelope are formed in a cylindrical shape in which the central axis of the inner diameter diverges from the central axis of the outer diameter and are constructed suc... | 04/27/2004 |
| 6700454 | Integrated RF array using carbon nanotube cathodes An array of carbon nanotube electron sources to make an integrated array of RF (radio frequency) sources in a single vacuum envelope. The RF sources can be printed circuit traveling wave tubes.... | 03/02/2004 |
| 6664734 | Traveling-wave tube with a slow-wave circuit on a photonic band gap crystal structures A printed circuit Traveling-Wave Tube (TWT) with a vacuum housing containing either a pair of identical meanderline slow-wave interaction circuits or a pair of multi-arm spiral slow-wave interaction circuits printed on two identical Photonic Band Gap crys... | 12/16/2003 |
| 6584675 | Method for fabricating three dimensional traveling wave tube circuit elements using laser lithography A method for constructing thermally and dimensionally stable traveling wave tube circuits having high dimensional stability, narrow tolerances, and very small size by providing a small hollow preform constructed of a desired material which is coated with ... | 07/01/2003 |
| 6583567 | Electron tube device mounted with a cold cathode and a method of impressing voltages on electrodes of the electron tube device A method and device are provided for preventing deterioration of a cold cathode in an electron tube device that utilizes the cold cathode as an electron source. In accordance with the expression defining the beam current of the electron tube device, Ib | 06/24/2003 |
| 6518703 | Electrodeless discharge energy supply apparatus and electrodeless discharge lamp device using surface wave transmission line Relatively uniform high frequency energy can be applied to a planar or linear discharge space and a more uniform discharge can be produced by using an electrodeless discharge energy supply apparatus which comprises a surface wave transmission line 11 for ... | 02/11/2003 |
| 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 |
| 6495961 | TWT power supply with improved dynamic range A power supply for a travelling-wave tube (TWT) includes a beam power supply (14) connected to the cathode and collector of the TWT, and a further power supply (20) connected to ground and to the collector for establishing the cathode-to-body voltage. A f... | 12/17/2002 |
| 6483242 | Traveling wave tube system with output waveguide-coupler termination A traveling wave tube is coupled to an output waveguide by an output coupler. The output coupler includes a single integral hollow termination body having an inner surface and an outer surface. The slow-wave propagation structure of the traveling wave tub... | 11/19/2002 |
| 6483243 | Multiband travelling wave tube of reduced length capable of high power functioning A traveling wave tube designed to operate as an amplifier within plural frequency bands, which includes a microwave line through which electrons travel and in which a signal is amplified. The microwave line includes, in succession, an input section separa... | 11/19/2002 |
| 6437510 | Crossed-field amplifier with multipactor suppression A crossed-field device such as a crossed-field amplifier or magnetron has a cathode body portion and an anode which cooperates with a crossed magnetic field to maintain emitted electrons on cycloidal paths and amplify an input signal or develop a microwav... | 08/20/2002 |
| 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 |
| 6329753 | M-type microwave device with slanted field emitter The present invention relates to M-type microwave devices and is aimed to improve effectiveness of using a working surface of field-electron emitters, to improve their reliability while increasing stability of field emission and service life of the device... | 12/11/2001 |
| 6236161 | Crossed-field device A crossed-field device such as a crossed-field amplifier or magnetron has a generally peripheral cathode body portion and an anode which cooperates with a crossed magnetic field to maintain emitted electrons on cycloidal and amplify an rf input signal as ... | 05/22/2001 |
| 6034572 | Magnetically insulated line oscillator microwave pulse generator In a magnetically insulated line oscillator device having a cathode 11, a surrounding slow wave structure 15 has a tapered configuration so that the effective cavity depth in the slow wave structure 15 progressively diminishes along a part of the length o... | 03/07/2000 |
| 5754006 | Broad-band traveling-wave tube with offsets on pole pieces and spacers A broad-band traveling-wave tube is provided, which contains a cylindrical waveguide made of a plurality of pole pieces and a plurality of spacers alternately arranged along its axis. A helix is placed in the waveguide to extend along the axis of the wave... | 05/19/1998 |
| 5742209 | Four cavity efficiency enhanced magnetically insulated line oscillator A four cavity, efficient magnetically insulated line oscillator (C4-E MILO) having seven vanes and six cavities formed within a tube-like structure surrounding a cathode. The C4-E MILO has a primary slow wave structure which is comprised of four vanes and... | 04/21/1998 |
| 5723948 | Helix travelling-wave tube with a maximum small signal gain at the operating voltage A helix travelling-wave tube of the present invention includes a helix wave delay circuit having velocity tapers for improving a beam efficiency and reducing backward wave oscillation. The tube allows a small signal and a large signal synchronous voltage ... | 03/03/1998 |
| 5694005 | Plasma-and-magnetic field-assisted, high-power microwave source and method The invention is directed to the reduction of an electron beam transport problem during microwave generation in plasma-assisted microwave sources. A small, e.g., | 12/02/1997 |
