L, U, T and F-shaped slots in patch antenna

In this work, different shaped slots such as L, U, T and F-shaped were used to design a microstrip patch antenna. The radiating elements of the proposed antenna was designed to be a symmetrical rectangular shape with respect to horizontal axis which have geometrical slots inside of it. Feed type of the designed antenna is circular shape via with 0.55mm. radius. The antenna was fed from center for the purpose to keep the symmetric form of the antenna. This patch antenna have all kind of slots combined thereby achieving more design degrees of freedom comparing similar antennas found in literature.