E2v Technologies (uk) Limited

Eev Limited

Michael Barry Clive Brady

Alan H Pickering

Bernard Richard Mulcahy

Kesar Saleem

Martin Bernard Edwards

Geoffrey Robert Dodd

Paul Simon Burleigh

A magnetron has a cathode, an anode with vanes, and an insulating surface which faces the cathode and receives material from the cathode due to sputtering at the cathode. A conductor enables the resistance of the film so deposited to be measured, giving an indication of the thickness of the film and the lifetime of the magnetron.

Magnetron having a feature for collecting material lost from a cathode thereof

In a magnetron having a bodydefining an anodedivided into resonant cavitiesby vanesand having a coaxial cathode, r.f. energy produced when a magnetic field is applied parallel to the axis of the anode is launched along a waveguideby an antennain an evacuated region of the magnetron closed by a dielectric window. The latter has sector shaped conducting areas on its surface symmetrically arranged with respect to the antenna, the inductance of which balance the capacitance of the dielectric window, thereby reducing reflections at the window.

Magnetron

A magnetron output arrangement includes a coaxial output adapted to be coupled in an endfire configuration to a rectangular waveguide. The waveguide has a flange for mating with the magnetron output arrangement. The coaxial output includes a central conductor. The output arrangement further includes a plate located in a predetermined position with respect to the central conductor. The plane of the plate is arranged to be substantially perpendicular to the axis of the coaxial output. The plate is located a predetermined distance from the end of the central conductor, such that the coaxial output in use couples with the plate so that the output coupling is substantially the same regardless of the type of waveguide flange employed.

Magnetron arrangements

A magnetron includes an anode having at least one vane defining a plurality of cavities and a dielectric resonator in communication with the at least one vane. The dielectric resonator is arranged to at least partially absorb radiation generated in a predetermined mode of operation of the magnetron.

Strapped magnetron with a dielectric resonator for absorbing radiation

A magnetron has an output comprising a coaxial line which transmits energy from a wanted oscillator mode as a first coaxial waveguide mode and energy from an unwanted oscillator mode as a second cylindrical waveguide mode. Energy in the cylindrical waveguide mode is intercepted by slots in the coaxial line and absorbed by material . This enables the modes to be separated. Preferably, the output is taken from the axis of the magnetron and the wanted oscillator mode is the &pgr; mode.

Magnetrons having a coaxial line output with unwanted mode energy reduction

An anode structure for a magnetron includes T-shape anode vanes having a radially extensive component and a circumferentially extensive portion, the cylindrical faces of the circumferential portion facing a cathode in the complete magnetron. The use of T-shape vanes increases inductance and hence permits low frequency radiation to be generated without increasing the dimensions of the magnetron compared to those of a conventional magnetron. Also, capacitance is increased to give a further reduction in frequency by using more than two anode straps, and preferably four anode straps at each end of the anode structure. Preferably, the anode structure is incorporated in a magnetron in which a high magnetic field of the order of 500 Gauss for a magnetron operating at 100 MHZ is used. The anode shell itself may form part of the magnetic return path. Other anode vane configuration, for example L-shaped, may be used.

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Maldon, United Kingdom

Michael Barry Clive Brady