Microwave oven with a regulation system using field sensors

A microwave heating device and a method for heating a load using microwaves are provided. The microwave heating device comprises a cavity adapted to receive a load and at least two microwave sources for feeding microwave energy into the cavity through at least two feeding ports respectively. The microwave heating device further comprises at least two field sensors adapted to measure field strengths of the microwave energy in the cavity. A first field sensor is arranged at a first location for measuring the field strength representative of a mode fed from a first feeding port and a second field sensor is arranged at a second location for measuring the field strength representative of a mode fed from a second feeding port. The microwave heating device further comprises a control unit connected to the microwave sources and the field sensors for regulating the microwave sources based on the measured field strengths. The present invention is advantageous in that it enables uniform heating of the load in the cavity.