A miniaturized triple-band planar antenna combing single-cell metamaterial structure and defected ground plane for WLAN/WiMAX applications

Abstract

In this paper, a novel miniaturized triple-band planar monopole antenna combing single-cell metamaterial structure and defected ground plane is proposed. The miniaturization and triple-band characteristic of the antenna are achieved by loading the designed multiresonant metamaterial unit cell. Furthermore, a compact annular defected ground structure is proposed and used to improve the bandwidth of the antenna effectively. The presented metamaterial inspired triple-band antenna has a compact size and a simple structure. To verify the performances of the antenna, a prototype is manufactured and measured. The experimental results indicate that the presented antenna has enough operating bandwidth of the 2.38–2.48, 3.37–3.79, and 4.36–6.06 GHz to cover all the desired WLAN and WiMAX operations. And the tested results also demonstrate that this antenna has good omnidirectional radiation patterns and reliable gains in three required bands. Thus, the presented antenna has broad prospects in many wireless communication applications.