Characteristics of a tunable microstrip bandpass filter under the influence of magnetic field

Hwang Cherng Chow*, P. Chatterjee, Kuei Hung Lin, Wu Shiung Feng

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review


A magnetic-field tunable 2.4 GHz microwave bandpass filter having insertion loss < −5dB on an FR4 substrate with the flaky magnetic material was designed and characterized. The tunability in the designed bandpass filter was achieved by adhering soft magnetic materials on top of the device. This soft magnetic material can be composed of ferromagnetic substance or ferrimagnetic substance. The performance of the designed bandpass filter under its influence is investigated. The frequency offset ratio changes over 30%. There is over 20% change in the center frequency towards the lower frequency region due to this application. These magnetic material layers achieved the center frequency shift and bandwidth extension without actually changing the original structure of the device.

Original languageEnglish
Pages (from-to)275-280
Number of pages6
JournalJournal of Magnetics
Issue number2
StatePublished - 2017

Bibliographical note

Publisher Copyright:
© 2017 Journal of Magnetics and The Korean Magnetics Society. All rights reserved.


  • Band pass filter
  • Magnetic field
  • Microstrip


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