SYSTEM AND METHOD FOR UNIFORM MICROWAVE HEATING

摘要

A microwave heater comprises a cylindrical housing having an inner surface defining an internal cavity. A microwave generator is secured adjacent a first end of the housing and received inside the internal cavity is a sample holder that comprises an annular base member positioned adjacent the first end has a central axis coinciding with a longitudinal axis of the housing. A first opening is formed along the central axis, an outlet of the microwave generator extending through the first opening along the central axis for emitting into the internal cavity electromagnetic waves centered at a given microwave wavelength. A circular support plate substantially parallel to the base member and concentric therewith, a cavity portion defined therebetween, is separated from the base member by a distance less than the given microwave wavelength for establishing a Transverse Magnetic (TM) 01 mode as a predominant resonance mode inside the cavity portion.

主权项

1. A microwave heater comprising:
a cylindrical housing having an inner surface defining an internal cavity; a microwave generator secured to the housing adjacent a first end thereof; and a sample holder received inside the internal cavity, the sample holder comprising:
an annular base member positioned adjacent the first end, the base member having a central axis coinciding with a longitudinal axis of the housing and a first opening formed along the central axis, an outlet of the microwave generator extending through the first opening along the central axis for emitting into the internal cavity electromagnetic waves centered at a given microwave wavelength, anda circular support plate substantially parallel to the base member and concentric therewith, the support plate separated from the base member by a distance less than the given microwave wavelength for establishing a Transverse Magnetic (TM) 01 mode as a predominant resonance mode inside a cavity portion defined between the support plate and the base member, thereby suppressing a multimode effect from the cavity portion.