A novel low-profile log-periodic ultra wideband feed for the dual-reflector antenna of US-SKA

We present a novel low-profile log-periodic ultra wideband (UWB) dipole antenna referred to as the Chalmers feed. The simulated results presented show that the antenna has low input reflection coefficient, low cross-polarization, constant beam width and constant phase center position over more than a decade bandwidth. The antenna can be enclosed in a volume of 0.5/spl lambda//sub L/, /spl middot/ 0.5/spl lambda//sub L/ /spl middot/ 0.15/spl lambda//sub L/ size, where /spl lambda//sub L/ is the wavelength at the lowest frequency. The ground plane needs to be somewhat larger. The antenna is intended to feed a dual-reflector antenna proposed by the US-SKA consortium.