A Bidirectional Multiband Antenna with Modified Fractal Slot Fed by Cpw

This paper presents a multiband slot antenna with modifying fractal geometry fed by coplanar waveguide (CPW) transmission line. The presented antenna has been designed by modifying an inner fractal patch of the antenna to operate at multiple resonant frequencies, which effectively supports the digital communication system (DCS 1.71–1.88 GHz), worldwide interoperability for microwave access (WiMAX 3.30–3.80 GHz), IMT advanced system or forth generation mobile communication system (3.40–4.2GHz), and wireless local area network (WLAN 5.15– 5.35GHz). Manifestly, it has been found that the radiation patterns of the presented antenna are still similarly to the bidirectional radiation pattern at all operating frequencies. The properties of the antennas, for instance, return losses, radiation patterns and gain are determined via numerical simulation and measurement. Corresponding author: C. Mahatthanajatuphat ([email protected]). 60 Mahatthanajatuphat et al.