Microwave heating apparatus with rotatable antenna and method thereof

摘要

A microwave heating apparatus and a method for heating/browning a piece of food by means of microwaves are provided. The microwave heating apparatus comprises a cavity arranged to receive, in a substantially horizontal browning region, a piece of food to be browned. The microwave heating apparatus further comprises a microwave source for generating microwaves and a rotatable antenna arranged at the cavity bottom for supplying the generated microwaves. The antenna is configured to produce at least one radiating lobe pointing towards the browning region such that the intersection between the radiating lobe and the browning region forms a hot spot, thereby forming a ring-shaped heating pattern in the browning region under rotation of the antenna. The present invention is advantageous in that a microwave heating apparatus with an improved crisp function is provided.

主权项

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.