The Bialkowski approach as extended by Bates is applied to solve for t
he driving-point impedance for a conical cap waveguide mount of arbitr
ary angle of taper. As an application of the driving-point impedance m
odel, a Gunn diode oscillator was designed and its tuning characterist
ics using two such waveguide mounts were measured. The predicted and e
xperimental results agree closely.