A 1.16-3.89-GHz Tunable Six-Channel Diplexer with Compact Size and High Isolation

A compact microstrip varactor-based diplexer with six tunable channels is proposed. Each output path contains only two varactor-loaded multi-mode resonators, by which three two-pole passbands/channels can be independently and continuously tuned over a wide bandwidth. Given the input return loss grea...

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Bibliographic Details
Published in2019 IEEE MTT-S International Microwave Symposium (IMS) pp. 5 - 8
Main Authors Pei-Ling Chi, Ching-Kai Chiou
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2019
Subjects
Capacitance
compact
Couplings
diplexers
filters
microstrip
multi-mode resonators
Resonant frequency
Resonator filters
Resonators
tunable
Tuning
varactor
Varactors
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Summary:A compact microstrip varactor-based diplexer with six tunable channels is proposed. Each output path contains only two varactor-loaded multi-mode resonators, by which three two-pole passbands/channels can be independently and continuously tuned over a wide bandwidth. Given the input return loss greater than 10 dB and output isolation greater than 26.1 dB, the six channels of the fabricated diplexer can be experimentally tuned in the range of 1.16~1.36, 1.65~1.81, 2.05~2.36, 2.57~2.86, 3~3.52, and 3.3~3.89 GHz, respectively. Measured results agree well with simulated results.
ISSN:2576-7216
DOI:10.1109/MWSYM.2019.8700989