Compact Dual Band Printed 2.5-Shaped Monopole Antenna for WLAN Applications

A novel compact printed antenna for dual band applications is presented. The antenna consists of two monopole elements and operates within the ISM 2.4 GHz and 5.2/5.8 GHz frequency bands. The proposed antenna provides a bandwidth of 403 MHz (2.184 GHz-2.587 GHz) in the lower frequency band and 4004 MHz (3.880 GHz-7.884 GHz) in the upper frequency band, respectively. Thus, it can cover multiple standards such as: HIPERLAN, 5.5 GHz WiMAX, and 2.4/5.2/5.8 GHz WLAN. Moreover, the lower resonant frequency of the proposed antenna can be easily tuned within 2.15 GHz to 3.22 GHz with almost no effect on the upper resonance. Additionally, the small ground plane size of the proposed antenna makes it suitable for almost any portable device.