Compact wide-slot tri-band antenna for wlan/wimax applications

TLDR: In this article, a triple band coplanar waveguide (CPW) antenna for WLAN/WiMAX applications is proposed, which mainly comprises a ground with a wide square slot in the center, a rectangular feeding strip and two pairs of planar inverted L strips connecting with the slotted ground.

Abstract: In this paper, a wide-slot triple band antenna fed by a coplanar waveguide (CPW) for WLAN/WiMAX applications is proposed. The antenna mainly comprises a ground with a wide square slot in the center, a rectangular feeding strip and two pairs of planar inverted L strips (PIL) connecting with the slotted ground. By introducing the two pairs of PIL's, three resonant frequencies, 2.4/5.5GHz for WLAN, and 3.5GHz for WiMAX, are excited. Prototypes of the antenna are fabricated and tested. The simulated and measured results show that the proposed antenna has three good impedance bandwidths (S11 better than i10dB) of 300MHz (about 12.6% centered at 2.39GHz), 280MHz (about 8% centered at 3.49GHz) and 790MHz (about 14.5% centered at 5.43GHz), which make it easily cover the required bandwidths for WLAN band (2.4{ 2.48GHz, 5.15{5.35GHz, and 5.725{5.825GHz) and WiMAX (3.4- 3.6GHz) applications. Moreover, the obtained radiation patterns demonstrate that the proposed antenna has flgure-eight patterns in E-plane, and is omni-directional in H-plane. The gains of the antenna at operation bands are stable.