In this paper we will study the usage of equivalent circuit; in
modeling a round shaped metal cylinder in rectangular waveguide
to get filters that can be calibrated and used in the microwave
domain. We will study the structure of a rectangular re
sonant
cavity linked stimulatory through thick openings. Also a metal
shape to be calibrated in rectangular resonant cavity linked
stimulatory through thick openings. We will use matlab for showing
transition and reflection factors for the suggested filters.