A tunable diplexer based on mixed coupling varactor-tuned stepped-impedance resonators

摘要

This article presents a novel tunable diplexer, which consists of two tunable bandpass channels based on a pair of mixed coupling varactor-tuned stepped-impedance resonators (VTSIRs), and a common-T junction constructed by two three-element T-networks. Two channels of the proposed tunable diplexer can be either independently tuned or simultaneously tuned toward high/low frequencies and middle of the tuning range. Compact circuit size is achieved and good electrical performance can be observed within the tuning range. (c) 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1469-1473, 2016