Multiple-stage combline bandpass filter made of λ/4 transmission line resonators

Description

A new design method is proposed for multiple-stage combline bandpass filter made of transmission line resonators. The Grayzel transformation is used for separating the two adjacent couplings of each resonator and decomposing the filter into a parallel connection of two coupled resonators. After the design is finished, identical resonators are equally spaced with auxiliary capacitors, which is the simplest structure to fabricate.

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