Claims
- 1. A microwave apparatus for substantially uniformly heating a dielectric material wherein microwave energy is supplied into a cavity in a manner causing at least two resonant modes to arise in the cavity, comprising: a metal enclosure, an insert made from a material, such as a ceramic material, with a low loss factor, said insert is contiguously enclosed by said metal enclosure, wherein the contacting surfaces of said insert conforms the shape of the inside surfaces of said enclosure, said insert further defines a cavity therein, a dielectric material to be heated which has a relatively high loss factor than said ceramic material, is attached to the surfaces within and substantially completely fills said cavity, means connecting at least two microwave energy sources to said cavity including means to effect simultaneous exciting of said cavity in at least two resonant modes, having different frequencies, which frequencies differ only slightly so that said at least two resonant modes arise and none of the zero points of the distribution of the electric energy density of said resonant modes conincides with any other zero points within said cavity.
- 2. An apparatus according to claim 1, wherein said means connecting the cavity to said at least two microwave energy sources are independent waveguides from associated said microwave energy sources and connected to and opening at different locations into said enclosure.
- 3. An apparatus according to claim 1, wherein said means connecting the cavity to said at least two microwave sources are coaxial conductors from associated said microwave energy sources and connected to and opening at different locations into said enclosure.
- 4. A method of effecting by microwave energy a substantially uniform heating of a dielectric material which has a relatively high loss factor, is attached to the surfaces within and substantially completely fills a cavity formed inside an insert which is made from a material with a low loss factor, such as a ceramic material, said insert is continuously enclosed by a metal enclosure, wherein microwave energy is supplied by two microwave energy sources into said cavity in a manner causing at least two resonant modes to arise in said cavity, said cavity being supplied simultaneously with microwave energy with at least two different frequencies, which differ only slightly, and said resonant modes being so chosen that none of the zero points of the distribution of the electric energy density of said modes within the cavity coincides with any other zero points.
Priority Claims (1)
Number |
Date |
Country |
Kind |
7704137 |
Apr 1977 |
SEX |
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CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation of application Ser. No. 892,014 filed Mar. 31, 1978 now abandoned.
US Referenced Citations (12)
Continuations (1)
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Number |
Date |
Country |
Parent |
892014 |
Mar 1978 |
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