Transmission line replacements for a lumped element reflectionless filter

Abstract

This paper investigates the possibility of constructing reflectionless filter prototype using transmission lines instead of lumped elements. The motivation for using transmission lines is to allow the filter to be used at significantly higher frequencies. Lumped element resonators can be replaced by open stubs with quarter and half wave lengths. To employ Kuroda identities, a new prototype is introduced by taking advantage of the even and odd mode symmetry of the lumped element filter. Frequency limits and bandwidth ranges will be considered.