Design of a modified rectangular patch antenna for quad band application

This paper presents the design of a modified rectangular microstrip patch antenna for quad band applications specially for C-band, X-band, Ku-band and Kband applications. The antenna is simulated using the commercially available software General Electromagnetic Solver (GEMS) simulator and MATLAB. Quad band is achieved using six vertical slits in the rectangular patch and feeding with microstrip feed line. The antenna has a compact structure and total size is 19.8 by 15.9 by 1.988 mm. The result shows that the return loss of -19.70 dB is achieved at the first resonant frequency of 5.75 GHz, -27.60 dB at the second resonant frequency of 11.70 GHz, -22.80 dB at the third resonant frequency of 13.95 GHz, -35.35 dB at the fourth resonant frequency of 18.15 GHz and -25.60 dB at the fifth resonant frequency of 19.95 GHz.