The ability and use of microwave life detection system to detect and search for the humans buried under rubble or collapsed building or laid behind multiple barriers has been investigated. Based on the movement and fluctuation of heart of a human under various layers of barriers and the detection ability of Doppler frequency a system has been proposed. This system operating at 1150 MHz can remotely detect the behavior of the trapped alive person. The operation principle is based on the microwave signals reflected from the period moving part of a living person body such as heart or lungs. In this paper various parts of the microwave life detection system such as patch antenna, directional coupler, power amplifier and low noise amplifier and life detection system software are simulated using ADS2003A. In addition, by using the simulated software, an overall performance of system has been investigated.

Keywords : X-band , Doppler Radar, ADS, Modulated Beam, Simulation, Remote Control, Patch Antenna, Directional Coupler.