Patent ID: 9538585
Date: 2017-01-03
CPC Classifications: H05B

Claim:
1. A microwave heating apparatus comprising: a cavity arranged to receive a piece of food to be browned; a stationary browning plate having a thermally conductive layer on an upper side for directly receiving the piece of food to be browned, and a microwave absorbing layer on a lower side, the browning plate being arranged in a substantially horizontal browning region configured outward of a center line of the browning plate; a microwave source for generating microwaves to a central microwave transmission port configured adjacent the center line of the browning plate below the browning region; and a rotatable antenna arranged at the cavity bottom for supplying the generated microwaves, the antenna having a sector-shaped panel arranged at a distance from the cavity bottom for providing a main between the sector-shaped panel and the cavity bottom through which the generated microwaves are supplied and configured to produce at least one radiating lobe pointing towards a periphery of the browning region such that the intersection between the radiating lobe and the browning region forms a hot spot, the antenna also having a single top opening at the top of the sector-shaped panel to form two ring-shaped heating patterns on the browning plate in the browning region under rotation of the antenna, wherein one ring-shaped heating pattern is configured closer to the center line of the browning plate and the central microwave transmission port than another.