A microwave oven is provided herein and includes a cavity. A first microwave supply system is configured to supply microwaves to a bottom of the cavity for energizing a crisp function. A second microwave supply system is configured to supply microwaves to the cavity for exciting cavity modes. A heating system is configured to provide a broiling function to the cavity. A control unit is configured to control the first microwave supply system, the second microwave supply system, and the heating system based on a mode of operation selected via a user interface.

A microwave heating apparatus comprises: a housing, arranged to define a cavity; a semiconductor RF generator, configured to provide at least one RF signal; and a plurality of RF antennas, arranged in a distributed way within the cavity and configured to radiate the at least one RF signal from the semiconductor RF generator, such that items received in the cavity are dielectrically heated by the radiation.

Aspects include a system that allows a microwave oven to intelligently self-choose the optimal cooking time for various items to prevent over/under cooking as well as overcoming cooking inconsistencies that are inherent in non-intelligent microwave ovens. Cooking time optimizations can be performed by controlling radio-frequency emission, cooking time, and/or rotation or movement of a turntable or platter within a microwave cavity of a microwave oven to more evenly heat the contents therein. A deflector system can be used to alter an angle of microwave energy directed with respect to a target object within the microwave cavity.

The present disclosure provides a microwave oven, and a thawing control method and device for the same. The method includes: acquiring a total period T of thawing according to a weight x of food in the microwave oven, wherein the total period T of thawing satisfies: T=K(x/100) seconds, where, 20 seconds/gK120 seconds/g; and controlling the microwave generator to start, and thawing the food according to the total period T of thawing. With the method, the thawed food is more nutritious, healthier, and easier to cut, and has the low temperature difference, without a cooked discoloration phenomenon.

The present disclosure provides a microwave oven, and a thawing control method and device for the same. The method includes: detecting temperatures of a plurality of temperature detecting points on food in the microwave oven; and controlling the microwave generator to start, and thawing the food according to the temperatures of the plurality of temperature detecting points on the food. With the method, the thawed food is more nutritious, healthier, and easier to cut, and has the low temperature difference, without a cooked discoloration phenomenon.

A microwave heating apparatus includes: a heating chamber which houses a heating object; a microwave generating unit which generates a microwave; a transmitting unit which transmits the microwave generated by the microwave generating unit; a waveguide-structure antenna which radiates to the heating chamber the microwave transmitted from the transmitting unit; and a rotation driving unit which drives the waveguide-structure antenna to rotate, wherein the waveguide-structure antenna has a microwave sucking-out opening in a wall surface forming a waveguide structure of the waveguide-structure antenna.

A microwave feeding system (10) for a microwave oven or an oven with microwave heating function, wherein the microwave feeding system (10) comprises a magnetron (12), a rectangular waveguide (14) and a cylindrical cavity (18), the cylindrical cavity (18) is connected or connectable to an oven cavity (20), a rotatable omnidirectional antenna (22) is arranged inside the cylindrical cavity (18), the omnidirectional antenna (22) is driven by an antenna motor (24), the omnidirectional antenna (22) is connected to the antenna motor (24) via a shaft (30) made of conductive material, an inner cavity (26) is arranged inside the cylindrical cavity (18), the inner cavity (26) is arranged coaxially to the cylindrical cavity (18), the inner cavity (26) encloses at least partially the shaft (30), and the inner cavity (26) and the shaft (30) are arranged coaxially to each other, characterised in that the magnetron (12), the rectangular waveguide (14) and the cylindrical cavity (18) are connected in straight series, wherein the microwave feeding system (10) provides elliptically polarized TEM electromagnetic waves for the oven cavity (20), and wherein the omnidirectional antenna (22) acts as a continuous phase shifter, and wherein an inner diameter of the cylindrical cavity (18) is between 0.75 and three multiples of the wave-length of the microwaves guided within said cylindrical cavity (18).

The present invention includes a directional coupler that detects at least part of a reflected wave inside a waveguide. When an object to be heated is absent, a reflected wave is strong, because there is nothing to absorb a microwave. When the object is present, the reflected wave is weak, because the microwave is absorbed by the object. As a quantity of the object becomes greater, a larger amount of microwave is absorbed by the object, and thus the reflected wave is weakened. It is thus possible to determine the quantity of the object from a reflected wave detection amount detected by the directional coupler without using a detector that detects a load.

The present invention has a configuration of controlling motor (15) so as to stop radiation antenna (5) when radiation antenna (5) faces in a direction in which a reflected wave detection amount is minimized and to stop radiation antenna (5) when radiation antenna (5) faces in a different direction different from the direction in which the reflected wave detection amount is minimized. According to this configuration, first, radiation antenna (5) stops when facing in the direction in which the reflected wave detection amount is minimized. This extends a heating time under the most efficient condition, improving a heating efficiency in comparison with when radiation antenna (5) constantly rotates. Second, radiation antenna (5) stops when facing in the different directions. This causes uneven heating when radiation antenna (5) faces in the direction in which the reflected wave detection amount is minimized as well as when radiation antenna (5) faces in the different directions. As a result, the uneven heating is cancelled out by the uneven heating each other caused at different locations. In this way, it is possible to achieve the even heating.

A microwave heating apparatus is disclosed. The heating apparatus comprises a cavity comprising a ceiling and a bottom support plate. The cavity is arranged to receive a food load. The apparatus further comprises at least one microwave supply system configured to supply microwaves at the cavity bottom. The at least one microwave supply system comprises at least one microwave source and at least one antenna arranged below the bottom support plate. The apparatus further comprises a heat element and a crisp plate. The heat element is connected proximate the ceiling and extends substantially over a ceiling area formed by the ceiling. The crisp plate is disposed in the cavity and vertically spaced from the bottom support plate by a rack.