Pole-location-based estimates of eigenmode characteristics of cylindrical corrugated structures

The paper presents an approach to estimate the range of location of the fir st natural frequencies of corrugated structures. It needs the knowledge of the solution of simple equations instead of the more complicated characteri stic equation for the corrugated structure. Inverted and noninverted magnet ron cavities are considered as examples. It is shown that not only the loca tion of the frequencies but also the general properties of the eigenmode fi elds can be predicted based on an analysis of geometrical properties of the simplified characteristic equation of the structure which is carried out i n terms of zeros and poles of the rigorous characteristic equation.