Varactor-Tuned Dual-Mode Bandpass Filter With Nonuniform Q Distribution

Hongliang Guo, Jia Ni, Jia-Sheng Hong

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)
304 Downloads (Pure)


This letter demonstrates an electronically reconfigurable
microstrip dual-mode filter with nonuniform Q lossy
technique. Varactors are used for continuous tuning of the
bandwidth and center frequency. By deploying nonuniform Q
distribution on the dual-mode open-loop filter, passband flatness
is improved by loading resistors on the even–odd symmetrical
plane of resonators. Coupling matrix is used to describe the
tunable lossy filter. Design of this type of four-pole tunable lossy
filter is presented and validated experimentally.
Original languageEnglish
Pages (from-to)1002-1004
JournalIEEE Microwave and Wireless Components Letters
Issue number11
Early online date5 Oct 2018
Publication statusPublished - Nov 2018


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