Microwave heating device
US5250773A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1991 |
| Grant date | Oct 5, 1993 |
| Priority date | — |
| Expiry date | Mar 11, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B6/80
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
There is provided by this invention an open-ended cavity microwave applicator apparatus for inducing current into an electrically conductive workpiece to be heated without need for the the applicator to be in contact with the workpiece. The microwave applicator is comprised of an open-ended housing that defines a cylindrical cavity which is coupled by an aperture to a waveguide which transmits the microwave energy from a microwave generator to the cylindrical applicator cavity. The microwave applicator is designed to operate in a subset of the circular TE.sub.mnp modes where m, n and p are the number of half wavelength variations in the standing wave pattern in the .theta., r,and z directions, respectively. The particular subset desired is the one in which m is equal to zero such that no current flows from the applicator to the electrically conductive workpiece. Of the subset of axially symmetric modes, TE.sub.0np, the preferred mode of operation is circular TE.sub.011. A conductive back plate forms one end of the applicator cavity while the other end is open so as to allow the microwave radiation to induce closed-loop currents in the workpiece being heated. The conductive back pla…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.