Optics and Photonics Society of Iran

In this paper, reflection and transmission from a body placed within a cylindrical waveguide with elliptical cross-section and conducting wall is computationally studied. First, the electromagnetic waves guidable in the waveguide are numerically obtained. Then, a dielectric body of refractive index n and thickness L which is co-section with the waveguide is inserted into it and its reflection as well as transmission coefficients are computed. It is shown that the highest reflection occurs near the cutoff frequency of the waveguide but in frequencies much larger than it, the body behaves as a Fabry-Perot resonator in an unbounded space and its reflection and transmission coefficients change periodically and resonantly with frequency.