Printed CPW-Fed Wideband Rhombus Slot Antenna for WiMAX applications

In recent years, wireless communications have progressed very rapidly. In order to provide with large bandwidth for any wireless application, wideband antenna design has become very important. In the reported literature [1-2], some of CPW-fed and microstrip-line-fed wide-slot antennas have been proposed for the wideband operation. The impedance bandwidths of the wide-slot designs [1-2] can reach about 15~88%. However, they are still not enough for wireless applications. For other reports in [3-5], some of slot antennas for WiMAX applications are proposed. However, the wideband technique used in these designs makes the antenna design more complicated. In this paper, a CPW-fed rhombus slot antenna is proposed for WiMAX applications. Good impedance matching for a wideband operation can be obtained. Within this wide operating impedance bandwidth, the same polarization plane and broadside radiation patterns can be excited.