In-Line Ports Dual-Mode Substrate Integrated Waveguide Filter With Flexible Responses

This letter proposes a novel in-line ports dual-mode substrate integrated waveguide (SIW) filter. By virtue of additional perturbation vias, for the first time, in-line ports can also realize flexible and high-performance responses in dual-mode SIW filter as good as the commonly used orthogonal/angled ports. With flexible ports configuration but without deterioration of flexibility or performance, dual-mode SIW filter can be more suitable for system circuits.