Abstract: The present disclosure relates to a microwave heating apparatus and method of heating a load using microwaves. The microwave heating apparatus comprises a cavity dividable into at least two compartments, a first microwave generator and a first feeding port for feeding a first mode field in a first compartment of the cavity, a second microwave generator and a second feeding port for feeding a second mode field in a second compartment of the cavity. The first mode field and the second mode field provide complementary heating patterns in the cavity when the cavity is undivided. The present disclosure provides the flexibility of heating a load in a large cavity or heating a plurality of loads in smaller compartments of the cavity while still providing even heating in the cavity and in the compartments.

Abstract: A microwave heating apparatus and a method of heating a load using microwaves is disclosed. The microwave heating apparatus includes a cavity configured to receive a load, a microwave source for generating microwaves and a plurality of transmission lines for guiding the generated microwaves to the cavity. The microwave heating apparatus may also include an electronic device adapted to adjust the impedances of each of the plurality of transmission lines individually, a measuring device adapted to obtain a signal representative of the impedance of each one of the plurality of transmission lines, and a control unit configured to control the electronic device based on the obtained signals. The microwave heating apparatus, as disclosed, provides a microwave heating apparatus configured to heat a load with improved energy efficiency and improved heating evenness.