Article ID: 15.20180295
This letter proposes a filter using a cylindrical quadruple mode SIW resonator. In the proposed resonator, the resonant frequency of each mode can be handled by the number of the ground via in a crisscross arrangement. Also, the external Q-factor of each mode is handled by the length and position of the I/O port line, and thus the filter structure was derived. As a result, it was confirmed that a quadruple-mode filter could be designed.