A novel compact super-wideband (SWB) antenna with an optimised feed is presented. The antenna is composed of an asymmetric trapezoid ground plane and a modified rectangular monopole patch. It is demonstrated that the bandwidth of the antenna is significantly enhanced by introducing an asymmetric dual-branch feed with an L-shaped feed branch. The measurements indicate that the 2:1 VSWR bandwidth is from 1.05 to 32.7 GHz with a ratio bandwidth of 31:1. Since the antenna features an extremely wide bandwidth and the entire size is only 74 x 80 mm, it is useful for modern wireless communication applications.