In this paper, design, simulation, production and measurement of a coplanar broad-band microstrip antenna printed on an alumina ceramic substrate is presented. Antenna may be used as an element in a radar applications operating at X-band (8 GHz-12 GHz). The antenna driven system consists of one more directors because of the requirements of directivity. The reason of using high dielectric substrates the antenna can be printed on very small spaces. Antenna in Package structure's temperatures rising up rapidly in radar applications so the use of ceramic substrates also has the advantage of using the antenna in high temperature conditions. The whole structure achieves a measured 52% frequency bandwidth for voltage standing-wave ratio <= 2 and 8-10 dBi absolute gain. The minimum line widths on the antenna is about 25 mu m so thin film technology is used in the fabrication process importance of the antenna.