Multiband Bandpass Filter Design Using E-Plane Septa For Waveguide Application

Multiband bandpass filter (BPF) design is proposed by utilizing E-plane septa to introduce transmission zeros in-band for waveguide application. Due to the unique employment of E-plane septa, multiband BPF responses are flexible to realize. Since number of transmission zeros is strongly dependent on the structure of employed septa, by adjusting the parameters of septa, dual-band, tri-band, and quad-band, multiband BPF responses are presented. While various multiband responses can be achieved without changing the structure, it is more competitive and compatible. Somehow, tri-band and quad-band W-band filters are fabricated for validation of the design technique for multiband BPF applications.