Abstract
A compact band-notched ultra-wideband (UWB) circular slot antenna to prevent interference from existing wireless local area network (WLAN) systems is presented. The proposed antenna has an interior circular stub for impedance matching and a pair of arc-shaped metallic arms embedded along the circular slot edge. The desired band-notched property can be obtained by adjusting the parameters of the arc-shaped metallic arms. In particular, this paper provides both the simulated surface current and magnetic field distributions to explain how the band-notched capability works. Details of the experimental results of the constructed prototypes are discussed.