Electromagnetic Waves Absorption Experiment on A Human Body with 2.45 GHz Directional Antenna

Micro-doppler radar is a technique that is also possible for medical applications, such as breath and heartbeat detection. These potential applications are coming from wave detection, which is reflected by an object under test. In an ideal environment like in an anechoic chamber room, the emitted radiation suffers from some losses, including path loss and object absorption. These losses reduce the detected power and later influence the accepted signal quality and accurate prediction. Among various loss factors, this paper presents human body radiation absorption by emitting electromagnetic waves at a frequency of 2.45 GHz of a directional horn antenna. In every experiment uses one type of antenna for transmitting and receiving radiation. The antenna is connected to a USRP software-defined radio module and then connected to a computer to obtain experimental data. The result shows that the absorption level of a human body detected by using the horn antenna is 11.07 dB. This information is useful to predict a reasonable power and distance that can be covered by a detection system by applying the micro doppler radar principle.