Compact triple-band stubs-loaded rectangular monopole antenna for WiMAX/WLAN applications

Abstract

A compact triple-band stubs-loaded rectangular monopole antenna for WiMAX/WLAN applications is presented and designed on Rogers RT/Duroid 5880 substrate. The stubs-loaded rectangular monopole antenna is employed a small rectangular patch, 50 Ω microstrip feed line, one T-shaped stub resonator, two asymmetrical inverted L-shaped stubs resonator, and partial ground plane. By loading these stubs, the antenna is resonating at three frequencies at 2.60/3.52/5.45 GHz and obtained impedance bandwidths of 180 MHz (2.50–2.68 GHz), 320 MHz (3.37–3.69 GHz), and 680 MHz (5.15–5.83 GHz), for 2.5/3.5/5.5 GHz WiMAX and 5.2/5.8 GHz WLAN band applications. The antenna provides monopole-like radiation pattern and stable antenna realized gains over the operating bands. In addition, the design approach of the proposed antenna is also discussed.