A novel CPW-fed disc antenna

Many disc antennas have been proposed for ultra-wideband (UWB) applications, but they suffer from the disadvantages of requiring a large ground plane and a complicated feed structure. This paper reports on a new and novel coplanar waveguide (CPW) fed disc antenna. Measured data show that the antenna provides more than a 3:1 bandwidth covering the frequency range of 2.4 ∼ 10.9 GHz for the tested prototype. Radiation patterns are dipole-like omnidirectional patterns with half power beam width (HPBW) values of 60° ∼ 70°. Maximum gain is about 2 ∼ 4 dBi over the bandwidth. The antenna has a good impulse response with less than 1 nanosecond pulse width and linear phase over a broad bandwidth. The CPW-fed disc antenna is a promising antenna element for UWB applications.