High-frequency heating apparatus

A high-frequency heating apparatus comprising:

• a heating chamber having a wall surface including metal and being configured to accommodate a heating target;
• a generator configured to generate high-frequency power, and
• a radiator having a loop antenna including a plurality of loop portions, and configured to radiate the high-frequency power generated by the generator to the heating chamber;
• and
• a controller configured to control a frequency of the high-frequency power generated by the generator, wherein
• the loop portions have different lengths from each other,
• each of the plurality of loop portions has a length equal to an integral multiple of half of a wavelength of the high-frequency power,
• the controller is configured to cause the generator to output the high-frequency power at a frequency at which resonance is generated in one of the plurality of loop portions, so that the high-frequency power is radiated from the one of the plurality of loop portions, and
• the controller is configured to cause the generator to output the high-frequency power at a frequency at which resonance is generated in another of the plurality of loop portions, so that the high-frequency power is radiated from the another of the plurality of loop portions.