Heater assembly and aerosol generating device comprising same

A heater assembly comprising:

• an oscillator configured to generate a microwave in a designated frequency band;
• and
• a resonance unit configured to receive the microwave generated by the oscillator through a coupler and cause the received microwave to resonate to generate an electric field,
• wherein the resonance unit comprises:
• an outer conductor including an accommodation space for accommodating an aerosol generating article, wherein the outer conductor comprises a first surface, a second surface facing the first surface, and a side surface surrounding an inner space between the first surface and the second surface;
• a first inner conductor extending from the first surface in a direction toward the inner space and surrounding one region of the aerosol generating article accommodated in the accommodation space;
• and
• a second inner conductor extending from the second surface in the direction toward the inner space and surrounding another region of the aerosol generating article accommodated in the accommodation space, and
• the aerosol generating article accommodated in the accommodation space is heated by the electric field generated by the resonance unit.