Design of a compact triple-band monopole planar antenna for WLAN/WiMAX applications

Abstract

In this article, a novel miniaturized tri-band monopole antenna for WLAN/WiMAX applications is presented and investigated. The proposed antenna consists of a horizontal H-shaped patch, an L-shaped open end stub, and a deformed inverted T-shaped strip. The patch attached to the 50-Ω feed-line through a matching line can increase the bandwidth of the proposed antenna. The bandwidths under the condition of |S11| ≤ -10 dB of the proposed antenna are 340 MHz (2.4-2.74 GHz), 340 MHz (3.41-3.75 GHz), and 640 MHz (5.24-5.88 GHz), respectively, indicating this antenna is suitable for WLAN (2.45-2.4835 5.16-5.35, and 5.725-5.85 GHz) and WiMAX (2.5-2.69, 3.4-3.69, and 5.28-5.85 GHz) applications. The antenna is successfully simulated and measured. Experimental results show that the proposed antenna with compact size of 30 × 20 × 0.8 mm3 has nearly omnidirectional radiation characteristics and stable gains across all the operating bands with a simple structure.