The Design of Linear TM Mode Filters with Nonresonating TE Mode

A new compact linear pseudoelliptic function filters were introduced, which is implemented by TM mode cavity structure. The transmission zeros are generated by nonresonating modes in the structure to provide additional paths for the energy transmission between adjacent resonators. Design guidelines to generate transmission zeros and how to control it are presented. Finally, various distributions of transmission zeros are given when two cavities are cascaded. Chebyshev and elliptic function filter are realized respectively, which verifies the flexibility of the filter design.