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Absorber device for microwave leakage
| Details |
Inventors: Ishino, Ken; Hashimoto, Yasuo;
Assignee: TDK Corporation (Tokyo, JP)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A microwave absorber device for a microwave heater having a main body with an opening and a door for closing said opening with a leakage path between the door and the main body. The absorber device has a choke cavity along a leakage path of the microwave energy between the main body and the door, said choke cavity having an approximate 1/4 wavelength of length, and an entrance facing said leakage path for accepting microwave energy. Said entrance of the choke cavity is closed by a cover plate made of ferro-magnetic material, which is a mixture of ferrite and gum. Preferably, an additional microwave absorber made of ferro-magnetic material which is integral with said cover plate is provided next to the choke cavity. Preferably, the dielectric constant of the material of the cover plate is less than 15. Still, preferably, the ratio of the imaginary part of the complex permeability to the real part of the same of the cover plate material is larger than 0.5. |
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DETAILED DESCRIPTION It is an object, therefore, of the present invention to overcome the disadvantages and limitations of prior microwave absorber devices.
It is also an object of the present invention to provide a microwave absorber device which has simple structure and provides enough attenuation with a relatively wide frequency band.
The above and other objects are attained by a microwave absorber device comprising a main body with an opening, a door for closing said opening, a choke cavity provided along a leakage path between the main body and the door, said choke cavity having the length approximately 1/4 wavelength and an entrance facing to said leakage path, said entrance of the choke cavity being closed by a cover means of a mixture of ferro-magnetic material and dielectric material, the dielectric constant of the cover means being less than 15.
Preferably, the ratio of the imaginary part of complex permeability of cover means to the real part of the same is larger than 0.
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Heat Accumulators 
