This Master’s Thesis project suggests a general procedure to design a Fabry-Pérot Cavity (FPC) antenna with two feeding that can be used for K-band applications such as satellite communications. In order to better understand this kind of antennas, a theoretical introduction on Leaky-wave antenna (LWA) and their 2-D version is presented at the beginning. Then, the antenna design starting from the basic unit cell is presented, explaining each step and showing several combinations of the FPC antenna parameter, in particular cavity height and distance between the feeding point of the two patch, in order to find the best solution for the broadside gain.