Band-notched UWB planar monopole antenna

A new ultra-wideband (UWB) octagon monopole with three notched bands is proposed. Two pairs of folded dipoles and a rectangular split-ring are introduced to form the three notched bands. The presented antenna not only supports UWB application but also rejects the frequency bands in 3.8–4.4GHz, 5.4–6.4GHz and 7.8–8.8GHz to avoid potential interference with existing communication systems.