Compact fractal antenna for WiMAX 1.4 GHz and IEEE 802.11a using double branch line

This paper describes a novel configuration of a CPW-fed fractal antenna that exhibits dual-band performances of WiMAX 1.4 GHz and WLAN bands. The proposed fractal antenna consists of unit-cell based duble branch line attached to fractal patch as the main radiator, and a pair of mirror rectangular-shaped notch on the ground plane. Dual-band operations can be obtained by adjusting dimensions and length of fractal branch lines of patch, simultaneously. The fractal antenna is of a compact size with dimensions 17 × 17 mm². The impedance bandwidth with S11 < -10 dB is about 2.3 GHz (1.1–2.2 GHz) for WiMAX 1.4GHz band and for WLAN-band 2.9 GHz (4.8–7 GHz). The measured peak gains are about 2.9dBi at WiMAX and 3dBi at WLAN-band. The fractal antenna has desirable S11 level, omni-directional radiation pattern and gain characteristics over the aforementioned bands. The proposed antenna is an excellent choice for multi-band wireless communication systems and mobile device.