ULTRA-WIDEBAND PLANAR MONOPOLE ANTENNA WITH DUAL STOPBANDS

摘要

A novel compact ultra-wideband (UWB) microstrip-fed planar monopole antenna with dual stopbands is presented. The proposed antenna achieved an impedance bandwidth of 3.1-10.6 GHz with VSWR <2, except the bandwidths of 3.3-3.8 GHz for WiMAX and 5.1-5.9 GHz for WLAN application. By etching four u-shaped slots with different dimension in the radiating patch, the dual stopbands for WiMAX and WLAN application can be obtained. And the stopband bandwidth for WLAN can be controlled by adjusting the three u-slots dimension. The fabricated antenna shows the broadband impedance-matching, good group delay, stable gain, and near omnidirectional radiation patterns.