Low-noise, crossed-field devices such as a microwave...

Details Low-noise, crossed-field devices such as a microwave... Low-noise, crossed-field devices such as a microwave...

2005-03-29

2005-03-29

Hoang, Tu (Department: 3742)

Electric heating

Microwave heating

With specific generator

C219S679000

Reexamination Certificate

active

06872929

ABSTRACT:
Low-noise, crossed-field devices such as a microwave magnetron, a microwave oven utilizing same, crossed-field amplifier and a method of converting a noisy magnetron to a low-noise magnetron utilize an azimuthally varying, axial magnetic field. The magnetic configuration reduces and eliminates microwave and radio frequency noise. This microwave noise is present near the carrier frequency and as sidebands, far separated from the carrier. The device utilizes azimuthally varying, axial, magnetic field perturbations. In one embodiment, at least one permanent magnet is placed against the azimuthally-symmetric, axial magnetic field magnetron magnets (four magnets work especially well). This additional permanent magnet(s) causes the axial magnetic field to vary azimuthally in the magnetron and completely eliminates the microwave noise and unwanted frequencies.

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