Centre National De La Recherche Scientifique

Regie Nationale Des Usines Renault

S.a. Microondes Energie Systemes

Michel Delmotte

Claude More

Alain Germain

Didier Delaunay

Bernard Maestrali

Lhoussain Outifa

Andre Berteaud

Henri Jullien

The invention concerns a device for microwave treatment in an applicator (), characterized in that it comprises, arranged in the applicator, impedance adapting dielectric means () having shapes and dimensions adapted to the objects () to be treated and to the characteristics of wave propagation modes.

Microwave treatment of objects and single-piece components

A device for microwave treatment of materials includes a mold (1) used to hold the material (3) to be treated and a microwave generator which is used to apply to the mold (1) the microwave energy necessary for treatment of the material. The mold includes at least two dielectric materials (4,5,6,7) surrounding the material (3) to be treated. The dielectric materials have dielectric permittivities which differ so that the attenuation of one elementary segment of length l located between the points of side z(n-1) and zn of the longitudinal dimension of the material (3) to be treated which includes at least one section broken up into segments of length l, is controlled by the relationship: ##EQU1## in which: .alpha. is the attenuation in the elementary segment in question,

Method to treat materials by microwave

A microwave applicator device for continuous heat treatment of elongate products comprises an applicator housing that defines a generally rectangular waveguide cavity and at least one excitation system for exciting the cavity with microwaves propagating in TE.sub.01 transverse electric mode, the system including at least one microwave generator associated with a feed waveguide connected to the cavity via a window formed through a wall of the cavity. The front and rear walls of the feed waveguide are respectively connected to the front and rear edges of the window, and the feed waveguide is associated with a guide flap extending in the cavity in the vicinity of the rear edge of the window, and with a guide member provided substantially facing the window. The front and rear walls of the feed waveguide include respective front and rear connection portions situated in the connection zone for connection with the window, and each being curved forwards substantially in the form of an arc of a circle, the guide flap is situated substantially in line with the rear connection portion, and the excitation system includes means for adjusting wave coupling.

Microwave applicator device for continuous heat treatment of elongate

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Bourg la Reine, France

Michel Delmotte