A new miniaturized planar UWB antenna with WLAN Band notch characteristics

In this paper, a new miniaturized ultra-wideband (UWB) antenna fed by coplanar waveguide (CPW) is proposed. Gear-shaped structures are employed around the circular disc radiator to impove the current distribution for the antenna miniaturization. Moreover, the gear-shaped structures can produce a wide impedance bandwidth and miniaturization structure. The antenna exhibits a wider bandwidth characteristic from 3.1 to 13.2 GHz with a relative bandwidth of 124%. To filter some bands and reduce the electromagnetic interference within the UWB communication system, an arc-shaped slit is etched on the radiating element in order to obtain a band notch characteristic in WLAN band. The two antennas have been fabricated on FR4 substrate, and good agreements are obtained between the measured and the simulated results.