In this work, detection of the fire location behind a wall by using microwave techniques is illustrated. According to Planck's Law, Blackbody emits electromagnetic radiation in the microwave region of the electromagnetic spectrum. This emitted waves penetrates all materials except that metals. These radiated waves can be detected by using directional and high gain antennas. The proposed antenna consists of a simple microstrip patch antenna and a 2x2 microstrip patch antenna array. FIT based simulation results show that 2x2 array antenna can absorb emitted power from a fire source which is located behind a wall. This contribution can be inspirational for further works.