A 1.4–2.3-GHz Tunable Diplexer Based on Reconfigurable Matching Networks


An idea for implementing reconfigurable matching networks to understand a tunable diplexer is investigated and demonstrated. The reconfigurable matching networks ensure that the rejection band impedance of every filter is remodeled to an open circuit over a wide selection of frequencies, permitting two tunable filters to be connected together to make a tunable diplexer while not affecting every other. The tunable diplexer is made using Schottky diodes and combline resonators on Duroid substrates, and can operate from one.4 to 2.three GHz with a closest frequency separation of one hundred ten MHz. Measurements show virtually no distinction in the frequency response between a standalone filter and a filter placed in the tunable diplexer. The work shows that a wideband tunable diplexer can so be realized using tunable bandpass filters and reconfigurable matching networks.

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