Dual-band filter using stepped-impedance and design method thereof

摘要

A dual band filter according to an aspect of the present invention includes cascaded impedance transmission lines of cascaded (N-1) stages, where N is a natural number of two or more; Stepped impedance open stubs connected to the connecting portions of the stepped impedance transmission lines, respectively; And stepped impedance ground stubs connected to the connection portions of the stepped impedance transmission lines, respectively.