Absorber device for microwave leakage

Electric heating – Metal heating – Of cylinders

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Details

219 1055R, 174 35GC, 174 35MS, H05B 676

Patent

active

045256144

ABSTRACT:
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.

REFERENCES:
patent: 3678238 (1972-07-01), Yasuoka et al.
patent: 3866009 (1975-02-01), Ishino et al.
patent: 3985993 (1976-10-01), Imberg et al.
patent: 4046983 (1977-09-01), Ishino et al.
patent: 4081647 (1978-03-01), Torrey
patent: 4166207 (1979-08-01), Burke
patent: 4332992 (1982-06-01), Larsen et al.

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