Planar Antenna for 3G/Bluetooth/WiMAX and UWB Applications With Dual Band-Notched Characteristics

A new planar monopole antenna that covers 3G, Bluetooth, WiMAX, and the UWB bands but exhibits dual band-notched characteristic is presented. By etching one quasi-complementary split-ring resonator (CSRR) in the feed line, dual notched frequency bands centered at 5.3 and 7.4 GHz are obtained. To achieve the lower resonance over the 3G band, the transmission-line-based metamaterial (TL-MTM) loading is employed to gain the benefit that the radiation pattern is orthogonal to other resonance modes. The proposed antenna has been successfully simulated and measured. Experimental results indicate that the proposed antenna yields an impedance bandwidth of 2-12.5 GHz with VSWR<; 2, except the dual notched bands of 5.0-5.5 and 7.2-7.6 GHz. Furthermore, good group delay and transmission characteristics can be achieved in the UWB band.