Heat treatment device and apparatus and method for detecting abnormality thereof

A heat treatment device comprising:

• a processor configured to generate target radio wave signals for heat treatment;
• and
• a radio wave signal transmitter comprising an antenna which transmits the target radio wave signals to a body of a user,
• wherein the processor is configured to:
• detect the target radio wave signals from the antenna;
• determine ratio information about a signal phase and a signal strength by comparing a reference target radio wave signal included in the detected target radio wave signals and each of the other target radio wave signals;
• and
• determine whether an abnormality occurs in the heat treatment device based on the determined ratio information and predefined reference ratio information,
• wherein the processor is configured to:
• divide the reference target radio wave signal into a first reference target radio wave signal and a second reference target radio wave signal;
• shift a signal phase of the second reference target radio wave signal;
• calculate a first difference value which is a difference value between a half-wave signal phase and signal strength of the first reference target radio wave signal and a first half-wave signal phase and signal strength of the other target radio wave signals;
• calculate a second difference value which is a difference value between a half-wave signal phase and signal strength of the second reference target radio wave signal and a second half-wave signal phase and signal strength of the other target radio wave signals;
• and
• calculate the ratio information based on the first difference value and the second difference value.