Multi-mode cavity for waveguide filters, including an elliptical waveguide segment

摘要

The cavity has at least one waveguide segment with elliptical cross section whose axes are arranged at a given inclination angle (. alpha.) with respect to the polarization of the incident TE field. Thus a dual- mode cavity is realized, with the ability to let resonate two transverse fields (TE) with polarization planes orthogonal to each other. By adding a waveguide element able to introduce a non-axial discontinuity, a triple- mode cavity is obtained, allowing for an additional longitudinal mode to resonate as well.