A fictional design of a compact microstrip patch antenna for multiband frequency has been depicted in this paper. The proposed design presents a slit P-shaped antenna that operates at 3.5 GHz, 5.9 GHz, 9.2 GHz and 13.1 GHz. FR-4 (lossy) is used as substrate to design the recommended antenna which has a firm dimension of 18 × 20 mm 2 . This antenna operates at S, C, X and Ku band with moderate bandwidth because of its design and feedline. This P-shaped multiband antenna has directive gain of 3.3dBi, 4.9 dBi, 6.5 dBi and 7.1 dBi at resonating frequencies and is suitable for a modern communication system. Regarding this antenna, the results are obtained in terms of Return Loss, Voltage Standing Wave ratio, Gain and Radiation Pattern which have admissible values of return loss less than -10 dB, VSWR less than 2 at each resonant frequencies and Gain more than 3 dB.