Also, a rectangular patch and a Hilbert fractal slot placed on the patch are designed to operate at the operating
frequency of 1.8 GHz and 2.4 GHz, respectively. Additionally, three resonant frequencies can be adjusted independently by altering the effective parameters. The presented antenna covers the application bands of GSM (0.87 - 0.96 GHz), DCS
(1.710 - 1.88 GHz), and WLAN (2.40 - 2.484 GHz). The effective parameters of proposed antenna will be investigated by using the full wave method of moment (MOM) in software package IE3D program.