Method and radio-thermometer for measuring electromagnetic energy radiated from inside of human body

A radio-thermometer system and method for measuring temperature of the inside of the human body are provided. The radio-thermometer system includes: an antenna, which receives thermal energy radiated from an object whose temperature needs to be measured; first and second noise sources, which are maintained at different temperatures in order to obtain a reflection coefficient GAMMA of an interface between the antenna and the object; a first switch, which periodically switches an output of the first or second noise source in response to a first pulse signal; a circulator, which adds a signal received by the antenna to a reflective wave output from the first or second noise source via the first switch and transmits an addition result in one direction; third and fourth noise sources, which are maintained at different temperatures; a second switch, which periodically switches an output of the third noise source, an output of the circulator, or an output of the fourth noise source in response to a second pulse signal, the second pulse signal being in synchronization with the first pulse signal; and an amplifier, which amplifies an output of the second switch. It is possible to achieve high precision and reproducibility of measurement of electromagnetic waves emitted from the human body by solving the problem of impedance mismatch at an interface between an antenna and the human body.