Frequency-independent equivalent circuit model for ferromagnetic RF integrated inductors

Kengo Sugahara, Shinji Tanabe, Masahiro Yamaguchi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We have proposed a method for identifying a wide-band equivalent circuit model for ferromagnetic radio frequency (RF) integrated inductors. The equivalent circuit parameters have been extracted from measured S-parameters by using a multiobjective simplex method, which sequentially switches three different cost functions, given by the average of error in Y-parameters, Z-parameters, and S-parameters. With this method, the optimization converged to the global minimum without being trapped at a local minimum. Calculated Y-parameters, Z-parameters, and S-parameters were in good agreement with the measured results in the range of dc to 20 GHz.

Original languageEnglish
Pages (from-to)3529-3531
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number10
Publication statusPublished - 2005 Oct


  • Circuit optimization
  • Equivalent circuits
  • Ferromagnetic materials
  • Scattering parameters
  • Thin-film inductors


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