This study addresses the design considerations of an air to ground millimeter wave radar (seeker). Briefly, all major aspects such as seeker components, required mathematical formulation, system parameters, signal processing is included. Millimeter wave radars are currently being used in military applications as airborne millimeter wave radar and ground based radar to provide air-to-air, air-to-ground, ground-to-air, ground-to-ground operations. We all focused to reveal design parameter of active seekers that are called as a military weapon. After a detail analysis it was concluded that the transmission frequency of 35 GHz is most suitable for this application. The transmitted power is reduced to 25 Watts without reducing the performance of the system.