Abstract: A microwave heating appliance, capable of achieving a locally concentrated heating in answer to the purpose while achieving a uniform heating in the overall heating chamber in a normal mode, is provided. The microwave heating appliance includes a microwave generating unit, a waveguide for transmitting a microwave from the microwave generating unit, a heating chamber for housing a heated subject heated by the microwave, a rotating antenna for radiating the microwave to the heating chamber, a driving unit for rotating and driving the rotating antenna, a temperature distribution detecting unit for detecting a temperature distribution in the heating chamber, and a controlling unit for controlling a direction of the rotating antenna based on a detected result of the temperature distribution detecting unit so that a sharp part of radiation directivity of the rotating antenna in a direction decided based on the detected result.

Abstract: An object of the present invention is to provide a microwave heating appliance capable of achieving a locally concentrated heating in answer to the purpose while achieving a uniform heating in the overall heating chamber in a normal mode.

Abstract: Pressure variation of combustion noise is detected by a microphone set in a combustion chamber, and the pressure propagation characteristic for the path from the gas flow control valve to the microphone is identified while the combustion apparatus is operating, and then an adaptive control is made using one signal detected by an microphone and the other signal produced by passing the signal of the microphone through a filter, and then a corrected anti-phase signal of a combustion noise is computed by the coefficient updating circuit, and the computed result is inputted to a gas flow control valve.