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| Number | Title | Issue Date |
| 6259208 | Optical tuning of magnetron using leaky light structure An optically tuned magnetron oscillator employs materials whose electrodynamic properties are altered by the absorption of light. A probe constructed from a leaky dielectric light guide coated with a photoconductive material is inserted into each of the m... | 07/10/2001 |
| 6064154 | Magnetron tuning using plasmas Improved magnetron oscillators that controllably form a plasma within each of its resonant cavities to rapidly change the resonant frequency of each cavity. The present invention also provides for frequency tuning methods for use with magnetron oscillator... | 05/16/2000 |
| 5894199 | Tertiary field tuning of positive anode magnetron A crossed-field device comprises a cathode having an electron emitting surface and an anode structure radially spaced from the cathode. The anode structure has a plurality of vanes extending in radial directions of the cathode with an interaction region d... | 04/13/1999 |
| 5537002 | Frequency tunable magnetron including at least one movable backwall There is provided a tunable high power magnetron. An annular anode circumscribes a cathode and contains a plurality of resonating cavities. The volume of the resonating cavities determines the output frequency of the RF energy emitted by the magnetron. Th... | 07/16/1996 |
| 5537084 | Method for improving spectrum quality of low power pulsed anode magnetrons An improved low power pulsed anode magnetron is provided having a cylindrical cathode centrally disposed within a plurality of radial anode vanes. An interaction region is provided between the surface of the cathode and the anode vane tips. A ratio of the... | 07/16/1996 |
| 5515011 | Pulsed magnetron circuit with phase locked loop 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 ... | 05/07/1996 |
| 5495145 | Pseudo-spring loading mechanism for magnetron tuner A apparatus for tuning a resonant cavity of a magnetron is provided which prevents undesired frequency fluctuation during thermal cycling or vibration. The magnetron has an axially disposed resonant cavity comprising a plurality of radially disposed anode... | 02/27/1996 |
| 5449972 | Low-torque magnetron tuning device A low-torque tuning apparatus is provided for use in a magnetron having an electron emitting cathode coaxially disposed within an anode cavity. The tuning apparatus includes a tuner drive capable of reciprocating axial movement relative to the magnetron. ... | 09/12/1995 |
| 5041801 | Magnetron tuning systems A magnetron is tuned by a co-axial transmission line co-axial with the axis of the magnetron and a radial transmission line linking the co-axial line to a plurality of sampling points symmetrically positioned on the end of the magnetron. A fraction of the... | 08/20/1991 |
| 5017891 | Magnetrons with resonator element for stabilizing output radiation frequency The performance of a magnetron may be degraded by its output frequency changing. This degradation may be reduced by fixing a resonator element in the magnetron's output waveguide enabling temperature stabilization to be achieved and also permitting the ou... | 05/21/1991 |
| 4881162 | Frequency control system A frequency control system is provided for controlling the radio frequency of a mechanically tuned coaxial magnetron under a wide variety of environmental conditions by initially tuning the magnetron according to resident tuning data and in response to a ... | 11/14/1989 |
| 4831341 | Magnetron with tuning member moveable by passing current through it A magnetron includes a cathode and vane type anode structure. The frequency of oscillation of a microwave output signal of the magnetron is tunable by means of a tuning member, which is in the form of an annular plate arranged adjacent resonant cavities o... | 05/16/1989 |
| 4745336 | Microwave generation by virtual cathode with phase velocity matching The present invention provides a vircator with improved efficiency. An elongated anode is aligned with an elongated cathode so as to produce an elongated virtual cathode when a direct current voltage source is electrically connected to the elongated catho... | 05/17/1988 |
| 4672340 | Multipactor discharge tuned resonant cavity devices A resonant cavity device--particularly a magnetron oscillator--has a separate resonator coupled to a resonant cavity of the device. The separate resonator consists of a resonant transmission line within which are two multipactor discharge arrangements, on... | 06/09/1987 |
| 4636749 | Pulsed magnetron tube having improved electron emitter assembly A tuning assembly (42) is disclosed for selectively oscillating the frequency of an electromagnetic field within a hermetically sealed pulsed magnetron (12), comprising a rigid, hermetically sealed housing (14), apparatus for generating the electromagneti... | 01/13/1987 |
| 4636750 | Magnetron with frequency sensor arrangement In a magnetron a spinner (22), rotatable on a longitudinal axis (x) has a number of evenly spaced markings formed circumferentially on an exterior surface. The markings are sensed, as the spinner rotates, by a photo sensitive transistor (PT) coupled to wi... | 01/13/1987 |
| 4635001 | Bearing arrangement in a tunable magnetron A bearing arrangement in a tunable magnetron, in which a sleeve-shaped body (12) is journalled on a central column (10) by means of two bearings (14, 15). The distance between the inner rings (18, 19) and outer rings (22, 23) of the bearings is determined... | 01/06/1987 |
| 4613788 | Arrangement in a tunable high frequency transmitter tube An arrangement for transmission of a predetermined fixed frequency by means of a tunable high frequency transmitter tube, such as a magnetron, the tuning of which can be varied periodically by means of a rotatable tuning body driven by a motor. The arrang... | 09/23/1986 |
| 4604587 | Tunable magnetron with internal tuning motor A rotatable tuning body is driven by a positioning motor such as a stepper motor, for varying the tuning frequency of a magnetron. The motor rotor is situated within the evacuated space of the magnetron and is integrated with the tuning body. The motor st... | 08/05/1986 |
| 4555680 | Magnetron tuned programmably using step motor A resonant-cavity type electronic tube having mechanically-operable tuning vanes associated with its resonant-cavity structure and disposed within an evacuable envelope. A support member is provided within the envelope for adjusting the tuning vanes relat... | 11/26/1985 |
| 4531104 | Tunable magnetron of the coaxial-vacuum type A tunable, coaxial-vacuum magnetron is shown having a cathode surrounded by an anode within a surrounding evacuated anode cavity. Located between the cathode-anode interaction space and an output from the anode cavity is a tuning mechanism which includes ... | 07/23/1985 |
| 4527094 | Altitude compensation for frequency agile magnetron A frequency agile magnetron employs an altitude compensation vacuum envelope external to the vacuum envelope of the magnetron. The tuning assembly of the magnetron includes a tuning plunger coupled through a first bellows assembly to one end of a tuning s... | 07/02/1985 |
| 4518932 | Coaxial magnetron having cavity walls vibrated by tuning fork A co-axial magnetron is provided with a cavity whose resonant frequency can be very rapidly altered in a cyclic manner so that the microwave output frequency of the magnetron can be chosen to lie within the available frequency band of the cavity. The cyli... | 05/21/1985 |
| 4345220 | High power microwave generator using relativistic electron beam in waveguide drift tube Coherent microwave radiation is generated in and transmitted through a waveguide/drift tube by means of an injected relativistic electron beam the parameters of which, in combination with the waveguide/drift tube geometry and dimensions effect a virtual c... | 08/17/1982 |
| 4331935 | Tuning apparatus for a radio frequency power device A tuning assembly is disclosed for selectively oscillating the frequency of an electromagnetic field within a hermetically sealed device, which device includes a rigid, hermetically sealed housing, apparatus for generating the electromagnetic field therew... | 05/25/1982 |
| 4330760 | System for correlating the operating frequencies of two variable-frequency microwave generators Two variable-frequency microwave generators, i.e. a coaxial magnetron producing outgoing waves and a voltage-controlled oscillator emitting a heterodyning signal for incoming waves of a radar transceiver, are continuously tuned by a pilot signal modifying... | 05/18/1982 |
| 4313091 | Crankshaft tuning mechanisms for microwave oscillators A resonant cavity of a microwave generator, such as a magnetron oscillator, is provided with a tuning piston which is rectilinearly displaceable between two terminal positions, corresponding to respective limiting frequencies, by means of a rotating crank... | 01/26/1982 |
| 4311968 | Magnetron having cavity wall vibrated by tuning fork A co-axial magnetron in which the microwave output frequency can be rapidly altered within a particular frequency band. A movable tuning plate is coupled to a mechanical tuning fork which is set into vibration by an alternating voltage applied to a soleno... | 01/19/1982 |
| 4296385 | X-Ray assisted multipactor discharge tuned resonant cavity device A multipactor discharge tuned resonant cavity device, e.g. a magnetron, is irradiated with X-rays in order to assist the starting of the multipactor discharge. The X-rays are produced by electrons striking the surface of the magnetron anode.... | 10/20/1981 |
| 4247828 | Reciprocating piston tuning mechanism for a microwave oscillator A resonant cavity of a microwave generator, such as a magnetron oscillator, is provided with a tuning piston which is displaceable between two terminal positions, corresponding to respective limiting frequencies, by means of a rotating crank-shaft whose e... | 01/27/1981 |
| 4234855 | System for linearly tuning a microwave oscillator A resonant cavity of a microwave generator, such as a magnetron oscillator, is provided with a tuning piston which is displaceable between two terminal positions, corresponding to respective limiting frequencies f1 and f2, by means o... | 11/18/1980 |
| 4162459 | Magnetron tuning circuit A circuit for the modulation of the frequency of radiation produced by a magnetron includes a directional coupler connected to the output port of the magnetron, a circulator coupled between the output port and a load, and a phase shifter connected between... | 07/24/1979 |
| 4115746 | Multipactor discharge tuned resonant cavity devices In a vane type magnetron oscillator a resonant co-axial transmission line breaks through the wall of the anode block to couple to two adjacent cavities on either side of a vane. Positioned at a point at which a high radio frequency voltage appears in oper... | 09/19/1978 |
| 4105951 | Multipactor discharge arrangements A multipactor discharge tuned resonant cavity device, e.g. a magnetron, is arranged with two multipactor discharge electrodes so that in a discharge condition a net current flows from one electrode to the other. The net current is used to create a self-bi... | 08/08/1978 |
| 3967155 | Electronic frequency tuning magnetron Cavity resonator electronic tubes, in particular magnetrons, with an electronic tuning system. The tuning systems in accordance with the invention consist of multipactor elements arranged directly within the resonant volumes of the tube cavities. Frequenc... | 06/29/1976 |
| 3936766 | Magnetron with capacitively coupled external cavity resonator A magnetron adapted for operation with an ungrounded power supply, has mounted thereon and tightly coupled thereto an external cavity resonator having coaxial first and second openings in opposite walls thereof. The magnetron has coaxial output connection... | 02/03/1976 |
