Date Added: May 2013
A quadband frequencies microstrip square patch antenna with double C-shaped slot at the patch is proposed in this paper. First, a rectangular shaped patch antenna is designed for 2.40 GHz frequency (WLAN application) with narrow bandwidth of 67 MHz (operate better than - 10 dB between 2.368 GHz and 2.435 GHz). Then, the double C-shaped slot had been embedded in the rectangular patch antenna. There are four stages of design with different dimensions of patch width and substrate width. This addition of this C-shaped slot had been producing a quadband frequency range of 2.40 GHz (2.368 GHz - 2.421 GHz), 5.0 GHz and 5.2 GHz (4.795 GHz - 5.333 GHz) and 5.6 GHz (5.521 GHz - 5.677 GHz).