Magnetron Oscillator Patents (Class 331/5)
  • Patent number: 9035707
    Abstract: The switching element is provided in a state of being electromagnetically coupled to the cavity resonator of the high frequency oscillator; the bias voltage applying terminal is connected to one electrode of the switching element; another electrode of the switching element is electrically connected to the cavity resonator (the anode shell in FIG. 1); the metal plate having a size enough for reflecting an electric wave to be transmitted before and after the switching element in a high-frequency manner is provided at any one end of the switching element; and by applying a bias voltage to the switching element and varying that, a reactance of the switching element is changed and a resonance frequency of the cavity resonator is varied. By this method, an oscillation frequency can be varied greatly relative to a small change in a bias voltage.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: May 19, 2015
    Inventor: Hideyuki Obata
  • Publication number: 20150047974
    Abstract: A plasma processing apparatus (11) is provided with: a processing container (12), in which processing is performed using plasma; a plasma generating mechanism (19), which has a high frequency oscillator that oscillates high frequency, includes a high frequency generator that generates high frequency by being disposed outside of the processing container (12), and which generates plasma in the processing container (12) using the high frequency generated by means of the high frequency generator; a determining mechanism, which determines the state of the high frequency oscillator; and a notifying mechanism, which performs notification of determination results obtained from the determining mechanism.
    Type: Application
    Filed: March 25, 2013
    Publication date: February 19, 2015
    Inventors: Kazushi Kaneko, Kazunori Funazaki, Hideo Kato
  • Publication number: 20120268214
    Abstract: A synthesizer includes a second frequency-synthesizing stage comprising a radiofrequency oscillator configured to oscillate at a frequency ?fo when it is synchronized with a signal s0(t), where a is a rational number different from one such that ?f0=ft. The radiofrequency oscillator has a magnetoresistive device within which there flows a spin-polarized electrical current to generate a signal st(t) oscillating at the frequency ft on an output electrode connected to the rendering terminal. This device is formed by a stack of magnetic and non-magnetic layers, a synchronization terminal for synchronizing the frequency of the oscillating signal st(t) with the frequency of the signal received at the synchronization terminal. The synchronization terminal being connected to the output terminal of the first stage to receive the signal s0(t).
    Type: Application
    Filed: April 20, 2012
    Publication date: October 25, 2012
    Applicant: Commissariat a lenergie atomique et aux energies alternatives
    Inventors: Jean-Philippe Michel, Michaël Quinsat
  • Patent number: 8237608
    Abstract: This disclosure is related to a magnetron including a cylindrical cathode having a center axis, an anode coaxially arranged with the cathode so as to be separated from the cathode via a predetermined space, and a pair of pole pieces provided to both ends of the cathode in the axial direction so as to oppose to each other and having opposing faces perpendicular to the axial direction. The pole piece has a first ridge of a ring shape that is formed on the opposing face and is coaxial with the cathode.
    Type: Grant
    Filed: July 28, 2009
    Date of Patent: August 7, 2012
    Assignee: Furuno Electric Company Limited
    Inventor: Tetsuya Takashima
  • Patent number: 8205428
    Abstract: A standard 4-pole electric motor stator with capacitive plates in-line with the magnetic poles, but electrically 90° out of phase, produces two Lorentz force geometries 90° out of phase with each other (i.e., vertical, horizontal). An alternating source electrically rotates this pair of Lorentz geometries producing a propagating electromagnetic wave at the source frequency within the vacant internal cavity. Any charged particle within the cavity and along its axis will be accelerated or decelerated from an initial velocity via the Lorentz force. The rotating geometry provides for the coupling of the Lorentz force through a current loop and diamagnetism, providing acceleration and deceleration of non-charged particles. The force coupling is dependent upon the material's electromagnetic properties, the frequencies generated by the capacitive stator, and the velocity of the particles within the capacitive stator's influence.
    Type: Grant
    Filed: February 5, 2009
    Date of Patent: June 26, 2012
    Assignee: Lockheed Martin Corporation
    Inventor: Dale W. Boren
  • Patent number: 8040189
    Abstract: A microwave system for driving a linear accelerator is provided. The inventive microwave system employs a plurality of magnetrons, at least one pulse generator to energize the magnetrons, means for synchronizing outputs from the magnetrons, and at least one waveguide for transmitting synchronized outputs or power from the magnetrons to a linear accelerator. The linear accelerator that is driven by the inventive microwave system demonstrates increased efficiency and dependability, higher energy and power outputs, as well as, different energy outputs that can take the form of successive pulses that alternate between at least two different energy levels.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: October 18, 2011
    Inventor: Paul H. Leek
  • Patent number: 7863988
    Abstract: A microwave signal generator includes a magnetron to generate a microwave signal, a coupler to receive the microwave signal generated by the magnetron and to send the microwave signal to a load; and a band-pass filter to receive the microwave signal from the coupler and to filter the microwave signal to obtain a signal from an oscillation frequency band of the magnetron. The band-pass filter feeds the signal from the oscillation frequency band back to the magnetron in order to fix an oscillation frequency of the magnetron and is a DR (Dielectric Resonator) filter.
    Type: Grant
    Filed: August 8, 2008
    Date of Patent: January 4, 2011
    Assignee: LG Electronics Inc.
    Inventors: Seung Won Baek, Chae Hyun Baek, Yong Soo Lee, Jin Joo Choi
  • Patent number: 7545226
    Abstract: A magnetron (2), a launcher (4) which extracts the output power of the magnetron (2), an impedance generator (5) having one terminal connected to the output terminal of the launcher (4), and a reference signal supplier (6) connected to the other terminal of the impedance generator (5) are included. The reference signal supplier (6) supplies, to the magnetron (2), a reference signal lower in electric power and stabler in frequency than the output from the magnetron (2). The oscillation frequency of the magnetron (2) is locked to the frequency of the reference signal by injection of the reference signal. The impedance generator (5) can reduce the change width of the oscillation frequency of the magnetron (2) by adjusting the load impedance of the magnetron (2). This implements a magnetron oscillator (1) which has high frequency stability and does not fluctuate the frequency even when the output power is changed.
    Type: Grant
    Filed: September 15, 2005
    Date of Patent: June 9, 2009
    Assignee: Nihon Koshuha Co., Ltd.
    Inventor: Kibatsu Shinohara
  • Publication number: 20090091395
    Abstract: The microwave signal generator includes a magnetron generating microwave signal. A filter filters a signal that may be a signal of the intrinsic oscillation frequency band of the magnetron, which is fed-back to the magnetron.
    Type: Application
    Filed: August 8, 2008
    Publication date: April 9, 2009
    Inventors: Seung Won Baek, Chae Hyun Baek, Yong Soo Lee, Jin Joo Choi
  • Patent number: 5515011
    Abstract: A semiconductor diode is connected across the cathode-to-anode path of a magnetron and through a storage capacitor and collector resistor to a supply voltage for enabling charging of the capacitor. A control pulse causes a switching transistor to conduct to discharge the capacitor through its collector-to-emitter path, an emitter resistor, and the magnetron, for causing the latter to oscillate. A feedback signal representative of the difference between the magnetron output frequency and a reference frequency is applied to a linear amplifier transistor which conducts through the emitter resistor for controlling the current flow through the switching transistor and the operating frequency of the magnetron.
    Type: Grant
    Filed: August 2, 1993
    Date of Patent: May 7, 1996
    Assignee: Litton Systems Inc.
    Inventor: Richard J. Pasco
  • Patent number: 5107272
    Abstract: A radar transmitter chain employing injection locked oscillator, e.g., a magnetron, as an output stage. Problems arise with maintaining the injection locking bandwidth centered on the radar source transmit frequency. This alignment is maintained by allowing the magnetron (38) free running frequency to drift, along with its injection locking bandwidth and then to force the radar source frequency (30) to follow the magnetron frequency. A phase difference measurement (44) between the injection signal (35) and the magnetron output signal (37) provides the control for a feedback loop (60) which may control a tunable VCO (48) or selection from a bank of fixed frequency oscillators (78).
    Type: Grant
    Filed: November 27, 1989
    Date of Patent: April 21, 1992
    Assignee: The Marconi Company Limited
    Inventors: David W. Joynson, Ian J. White
  • Patent number: 4961058
    Abstract: 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 injection locking a smaller oscillator and using the output to stabilize the source, or the filtered power may be amplified in a reflection amplifier and injected into the source for stabilization.
    Type: Grant
    Filed: May 22, 1989
    Date of Patent: October 2, 1990
    Assignee: Motorola, Inc.
    Inventor: Bernard E. Sigmon
  • Patent number: 4823133
    Abstract: The invention relates to a radar system comprising a transmitter with a periodically tunable HF-transmitter tube, as a magnetron with rotating tuning body, and a receiver with a mixing stage, in which echo pulses caused by transmitted radar pulses are mixed with the output signal from a local oscillator, whose frequency can be controlled. During transmission the tuning frequency of the transmitter tube is varied periodically and in an interval before triggering the local oscillator is "slaved" to the transmitter tube, so that the local oscillator frequency follows the variations in the tuning frequency. In the triggering moment the local oscillator is locked in frequency to the value prevailing in the triggering moment. According to the invention this system is combined with a frequency predicting circuit, which mainly consists of a comparator.
    Type: Grant
    Filed: January 27, 1988
    Date of Patent: April 18, 1989
    Assignee: U.S. Philips Corporation
    Inventors: Kjell S. Anflo, Jan W. I. Grabs, Roland H. Ivarsson
  • Patent number: 4809004
    Abstract: The invention comprises a weather radar system in which a magnetron transmitter is controlled in frequency by injecting therein a low power locking signal from a stable frequency source. Frequency lock between the source and the magnetron is maintained without requiring injection signals of excessive power by an automatic frequency control (AFC). The AFC determines the frequency and phase error between the injection signal and the magnetron output and adjusts the frequency of the source so as always to be within a narrow band of frequencies centered about the natural frequency of the magnetron. Over the long term, therefore, the frequency of the source will vary by an amount equal to the change in the natural frequency of the magnetron occurring during that time. Over the short term, however, the difference in frequency between the injection signal and the magnetron output is zero, while the phase difference is less than
    Type: Grant
    Filed: November 23, 1987
    Date of Patent: February 28, 1989
    Assignee: Allied-Signal Inc.
    Inventors: Ruy L. Brandao, Henri Baran, Arezki Manseur, Steven R. Sweet
  • Patent number: 4682178
    Abstract: The invention relates to a coherent radar comprising a magnetron (10), a modulator (12) for pulsed driving if the magnetron, a stable local oscillator (22) and mixer (20) for producing an intermedicate frequency signal of incoming echoes and an intermediate frequency oscillator (28) and phase sensitive detector (26) for detecting the echo pulses in order to generate a so called bipolar video signal. According to the invention a HF-signal derived from the stable oscillator (22) is fed to the tuning cavities of the magnetron (10), so called priming, at least in the transmission moment, and furthermore the modulator (12) and the intermediate frequency oscillator (28) are mutually time controlled in such manner that the leading edge of the modulator pulse and thereby of the magnetron pulse always appears in a given phase position of the output signal from the intermediate frequency oscillator, for example a zero passage.
    Type: Grant
    Filed: January 11, 1985
    Date of Patent: July 21, 1987
    Assignee: U.S. Philips Corporation
    Inventors: Kjell S. Anflo, Jan W. I. Grabs
  • Patent number: 4571552
    Abstract: Phase locking of the output signal of a magnetron with a frequency source signal is obtained by a phase comparison of the output signal and source signal to obtain an error signal which energizes a winding of the magnetron magnet to thereby change the flux experienced by the magnetron tube operating in conjunction with frequency pulling of the magnetron output signal by the source signal coupled to the magnetron by a three-port circulator.
    Type: Grant
    Filed: July 2, 1985
    Date of Patent: February 18, 1986
    Assignee: Raytheon Company
    Inventor: William C. Brown
  • Patent number: 4389594
    Abstract: The anode cavity of a power magnetron is connected through a coupling slot to a reactively terminated waveguide structure containing one or more selectively magnetizable ferrite elements acting as adjustable differential phase shifters for two microwave components circulating in opposite directions through the structure or traversing a guide portion in the same direction but with opposite circular polarization. In the first instance the structure comprises two parallel rectangular-section waveguides with a common lateral wall having a proximal and a remote opening serving as directional couplers therebetween; in the second instance the structure is a circular-section waveguide with a main portion occupied by the ferrite element and transition portions separating that main portion from the coupling aperture and from the reactive termination.
    Type: Grant
    Filed: August 6, 1980
    Date of Patent: June 21, 1983
    Assignee: Societa Italiana Telecomunicazioni Siemens S.p.A.
    Inventors: Giuseppe Conciauro, Paolo Arcioni