Application of a Series Open Circuit Stub Transform to Bandpass Filter Design

Abstract

A bandpass filter design is proposed that is based on a transmission line transform that transforms an open circuit series stub to a short circuited shunt stub. The transform was originally proposed for the design of pseudo-highpass filters, and is exact only at the band-edge frequency of the design. In this paper the transform is applied to the design of bandpass filters that is based on the classic redundant filter design, but with the application of the new transform.