A new broadband short-backfire antenna as a prime focus feed single and dual band

A design by Ohmori et al. (1983) of a short-backfire antenna used in the Green Bank Telescope at the National Radio Astronomy Observatory is the basis for the design presented in this paper. The current design shows small variation in beamwidth as a function of frequency, good circular symmetry of the beam and return loss better than -13 dB over the entire 30% band. A concept of a dual-band version of the SBA at 342/800 MHz has been tested. Such a feed would facilitate pulsar observations at the two bands simultaneously.