Small size uniplanar monopole antenna with triple-band operation

A small size (15 × 35 × 0.8 mm
³
) coplanar waveguide (CPW) fed monopole antenna design with triple-band operation for WLAN (Wireless Local Area Network) and WiMAX (Worldwide Interoperability for Microwave Access) applications is proposed. The basic structure of this proposed design is a simple uniplanar C-shaped monopole loaded with two additional brand strips. From the measured results, the 10-dB impedance bandwidths of the three operating bands (f
_L
, f
_M
, and f
_H
) are 23.17% (2.175-2.745 GHz), 15.04% (3.32-3.86 GHz), and 37.91% (4.895-7.185 GHz), respectively. Furthermore, the three operating bands have also yielded peak gain and radiation efficiency of more than 0.69 dBi and 65%.