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A low-loss, continuously tunable microwave notch filter

Published online by Cambridge University Press:  16 April 2015

Öncel Acar*
MTI Radiocomp, Krakasvej 17, 3400 Hillerød, Denmark DTU Electrical Engineering, Ørsteds Plads Building 348, 2800 Lyngby, Denmark
Tom K. Johansen
DTU Electrical Engineering, Ørsteds Plads Building 348, 2800 Lyngby, Denmark
Vitaliy Zhurbenko
DTU Electrical Engineering, Ørsteds Plads Building 348, 2800 Lyngby, Denmark
Corresponding author: Ö. Acar Email:


The development in high-end microwave transceiver systems toward the software defined radio has brought about the need for tunable frontend filters. Although the problem is being tackled by the microwave community, there still appears to be an unmet demand for practical tunable filter technologies. With this motivation, this work presents a tuning method that delivers a resonator Q0 of 2000–3621 within a minimum tuning ratio of 1:1.42. A continuously tunable notch filter based on this tuning method is presented. The design is manufactured, measured, and verified. It is shown that the tuning technology compares favorably to other selected technologies.

Research Paper
Copyright © Cambridge University Press and the European Microwave Association 2015 

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