The finite difference time domain (FD-TD) method has been used to stud
y the short backfire antenna which is a compact feed for reflector ant
ennas. A parametric study of a short backfire antenna has been perform
ed which, for the first time, enables an optimum design to be obtained
, The computed results have been validated by constructing and measuri
ng an experimental antenna which gave measured results in good agreeme
nt with the predictions.