Abstract—Cellular Mobile Communication is need of world. In this era life cannot imagine without cell phone. In this paper it has been designed a two antenna for GSM communication at 1800MHz. First antenna is Rectangular Microstrip Patch Antenna(RMPA), and second one is Slit Slotted Rectangular Microstrip Patch Antenna(SSRMPA). Basic property of both the antenna like simulated design, Returnloss, Electric field Distribution, Radiation Pattern are discussed. Finally it is shown that Return Loss of Antenna in Slit-Slot Patch is decreased about 92.52%, and antenna Directivity is also increased a bit, and Total Efficiency of slit-slot RMPA is increased about 12.48% Slit-Slot Rectangular Microstrip Patch Antenna also Reduces the size of antenna which is always a basic need of cell phone antenna design system. Slit Slotted RMPA also improving the result by lowering the return loss at 92.52% almost all losses removed.