A Compact Band-Notched UWB Antenna with Controllable Notched Bandwidths by Using Coupled Slots

Abstract

A compact coplanar waveguide fed (CPW-FED) ultrawideband (UWB) antenna with controllable notched bandwidths for WLAN bands ranging from 5.3 GHz to 5.7 GHz is proposed and implemented. The proposed antenna consists of part of a circular patch and two modified ground planes. Two upper half-wavelength C-shaped slots and another lower half-wavelength C-shaped slot are coupled separately to form a band rejection. The simulation and measurement show that the proposed antenna achieves a well-matched broadband impedance of 3.1–10.6 GHz (|S11| < –10 dB), except the rejection bandwidths of 5.3–5.7 GHz for the centre band of WLAN (|S11| > –5 dB). Moreover, the notched bandwidths can be controlled by adjusting the coupling distances of the corresponding slots. The antenna is successfully designed, simulated and measured with broadband matched impedance and near omnidirectional radiation patterns.