Antenna construction for microwave oven
US4028521A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1976 |
| Grant date | Jun 7, 1977 |
| Priority date | — |
| Expiry date | Feb 26, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B6/725
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A microwave oven in the form of an enclosed cavity having a magnetron and waveguide communicating with the cavity via a hollow conductor penetrating one of the walls. Centrally mounted in the conductor is an antenna having a straight shank portion and a radially extending arm portion, with an angled transitional portion inbetween, the transitional portion bearing an obtuse angle to the shank portion lying within the range of 105.degree. and 165.degree. and having a length at least equal to the radius of the hollow conductor so that the transitional portion and the arm portion radiate a "guided" wave in a direction different from that of the "inertial" wave radiated directly from the hollow conductor. The shank portion of the antenna is supported in a rotatable mount in the waveguide, and a motor coupled to the mount rotates the antenna for sweeping the guided wave throughout the cavity for improved energy distribution in the cavity and relative freedom from hot spots. In the preferred form of the invention the radially extending arm portion has a length greater than the transitional portion and the cavity includes a thermal heating element which is arranged substantially in the pla…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.