A study of the optimum field emitter shape for vacuum electronics applications

A summary of a study on optimum field emitter models is introduced in this paper. Ten models of field emitter are presented and the electric field on the top of these field emitters in the given structure of triode are calculated using EMAS software. It is seen that sharp pyramid-on-post is the best shape of field emitter due to high field enhancement, reasonable mechanical stability and thermal contact, low capacitance and high transconductance.