Miniaturized Multiband Slotted Microstrip Antenna for Wireless Applications

A miniaturized multiband slotted Microstrip antenna for wireless applications is designed and its characteristics have been investigated. The proposed antenna consists of a substrate, one side of substrate is having rectangular radiating patch containing C-shaped slots and other side is having a partial ground plane. The dimensions for proposed antenna are kept small to 25 x 25 x 1.6 mm. The number, length/width, and positions of the C-shaped slots have been selected suitably so as to achieve results for return loss, VSWR in frequency bands of interest. The proposed antenna characterizes four bands at resonant frequencies of 3.39, 4.29, 5.46, and 5.77 GHz with return loss values of -16.45, -19.24, -11.85, and -12.35 dB and VSWR values of 1.37, 1.24, 1.69, and 1.64 respectively. The designed antenna can serve IEEE 802.11a radio WLAN applications in frequency band 5.180-5.825 GHz, IEEE 802.16-2004 fixed WiMAX applications in frequency band 2-11 GHz, and IEEE 802.16e mobile WiMAX applications in frequency band 2-6 GHz. The proposed antenna has nearly omnidirectional radiation pattern exhibiting reasonable gains across the desired frequency bands.