On the transverse surface boundary effect in Gunn devices

A comparison between a rather rigorous space-charge wave theory by Kino and Robson and a simplified large-signal model proposed by the author, concerning the influence of the transverse surface boundary condition on the space-charge dynamics in thin-sheet Gunn devices, shows that the results of both approaches are equivalent. It is also concluded that the oscillation frequency in such devices may be much larger than in ordinary samples.