Dual-polarized dual-band CPW-fed slot antenna for WLAN applications

Abstract

A dual-band dual-polarized CPW-fed slot antenna for WLAN applications is presented. The antenna shows two resonant dips at 3.56 GHz and 5.12 GHz. For the WLAN band (3.6 GHz) the antenna shows a circularly polarized behavior, whereas in case of the other band it is acting as a linearly polarized component. The design geometry consists of a CPW-fed thin slot structure with an LC complimentary resonator loaded at the end of the CPW trace line. The resonator is loaded at an offset of 0.5 mm with respect to the center of the CPW-trace to realize the circular polarization. The structure is simulated and studied for the s-parameters and the axial ratio (AR) values those suggest its characteristics as will be presented through this article. The surface current distributions and the radiation patterns are investigated to conclude about the performances. The simple structure and its dual-band dual-polarized attributes claim its novelty and suggest its wide applicability in the commercial sector for practical operations. The simulated and the measured results for the structure were found to be in good agreement with each other, consequently establishing the usability of the component for commercial production and applications.