Patent ID: 6884979
Filing Date: 2005-04-26
Classification: H05B,Y02B

Abstract:
1. A microwave oven comprising a cavity that is defined by an enclosing surface and adapted to receive a load to be heated, and a microwave source which is connected to the cavity for feeding microwaves to the cavity, which cavity is provided with at least two feeding ports wherein the cavity is designed to support at least two modes which are separately feedable through at least a respective feeding port and the separately feedable modes exhibits essentially non-overlapping heating patterns, and each one of the feeding ports is arranged to feed energy to a respective predetermined mode in the cavity, while feeding of energy to a mode other than the predetermined associated mode is essentially prevented, the feeding ports being placed at such a location that mainly one single mode is feedable by means of each feeding port and a transmission line in the form of a stripline or a microstrip, wherein the transmission line has a slot in its ground plane at a location that at least partly overlaps the feeding port at the same time as the transmission line exhibits a maximum current at the slot, whereby the magnetic field in the transmission line is let into the cavity and, thus, feeds energy to it.