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Class Information
Number: 330/43
Name: Amplifiers > With traveling wave-type tube
Description: Subject matter wherein the amplifying device is of the vacuum tube type including means for generating an electron stream or beam, and having additional means therein for propagating an electromagnetic wave or component thereof at a velocity reduced from the free space velocity of the wave and propagated in proximity of the electron stream or beam, permitting exchange of energy between the electrons and the electromagnetic wave.

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8674759 Power management system for dual travelling wave tube amplifier Mar. 18, 2014
8624495 High frequency helical amplifier and oscillator Jan. 7, 2014
8624494 High frequency helical amplifier and oscillator Jan. 7, 2014
8618736 High frequency helical amplifier and oscillator Dec. 31, 2013
8525588 Vacuum electronic device Sep. 3, 2013
8242696 Vacuum electronic device Aug. 14, 2012
8212481 Voltage control apparatus, power supply apparatus, electron tube and high-frequency circuit system Jul. 3, 2012
8179048 High frequency helical amplifier and oscillator May. 15, 2012
7898346 Power supply apparatus and high-frequency circuit system Mar. 1, 2011
7888873 Dynamic depressed collector Feb. 15, 2011
7538608 Photonic crystal ribbon-beam traveling wave amplifier May. 26, 2009
7525385 Common drain driven cascode enhancement mode traveling wave amplifier Apr. 28, 2009
7459855 Low-spurious-radiation microwave tube Dec. 2, 2008
7368874 Dynamic depressed collector May. 6, 2008
7358803 Broadband high efficiency traveling wave tube amplifier system Apr. 15, 2008
7315206 Travelling-wave amplifier Jan. 1, 2008
7230480 Estimating the operating point on a non-linear traveling wave tube amplifier Jun. 12, 2007
7190108 Methods and apparatus using pulsed and phased currents in parallel plates, including embodiments for electrical propulsion Mar. 13, 2007
7142052 Travelling wave amplifiers Nov. 28, 2006
7138860 System and method for envelope modulation Nov. 21, 2006
7071624 Microwave tube system and microwave tube Jul. 4, 2006
6791408 System and method for noise and spurious suppression in power amplifier systems Sep. 14, 2004
6781454 Linearized traveling wave tube circuit with pre-distortion linearizer Aug. 24, 2004
6734734 Amplifier phase droop and phase noise systems and methods May. 11, 2004
6611719 Cancer thermotherapy Aug. 26, 2003
6590450 System and method for linearizing vacuum electronic amplification Jul. 8, 2003
6586883 Method and apparatus for detecting individual TWT helix current for multiple TWT loads Jul. 1, 2003
6555964 Device, notably for controlling a travelling-wave tube Apr. 29, 2003
6498532 System and method for linearizing vacuum electronic amplification Dec. 24, 2002
6489842 Multiple traveling wave tube amplifier electronic power conditioner with centralized low voltage and distributed high voltage Dec. 3, 2002
6486604 Traveling-wave valve arrangement Nov. 26, 2002
6462474 Grooved multi-stage depressed collector for secondary electron suppression Oct. 8, 2002
6459337 System and method for noise and spurious suppression in power amplifier systems Oct. 1, 2002
6369648 Linear traveling wave tube amplifier utilizing input drive limiter for optimization Apr. 9, 2002
6369511 Travelling-wave tube amplifier Apr. 9, 2002
6360084 Dual-band RF power tube with shared collector and associated method Mar. 19, 2002
6353525 Arrangement in a power unit for a grid-pulsed, O-type microwave tube Mar. 5, 2002
6346853 Predistortion linearizer circuit Feb. 12, 2002
6177836 Feed forward linearized traveling wave tube Jan. 23, 2001
6049249 TWT with mismatched section for controlled gain variation with frequency Apr. 11, 2000
5940025 Noise cancellation method and apparatus Aug. 17, 1999
5862462 Power enhancement techniques for high power satellites Jan. 19, 1999
5838195 Reduction of second order harmonic distortion in high power TWT amplifiers Nov. 17, 1998
5834971 RF amplifier including traveling wave tube with sequential stages Nov. 10, 1998
5789978 Ku-band linearizer bridge Aug. 4, 1998
5773933 Broadband traveling wave amplifier with an input stripline cathode and an output stripline anode Jun. 30, 1998
5649310 Signal translation and amplification system including a thermal radiation panel coupled thereto Jul. 15, 1997
5604402 Harmonic gyro traveling wave tube having a multipole field exciting circuit Feb. 18, 1997
5568014 Traveling-wave tube amplifier having collector potential lower than body potential Oct. 22, 1996
5500621 Travelling-wave tube protection arrangement Mar. 19, 1996

1 2 3

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