Novel Type of Conducted Noise Suppressor in GHz Range Using Ferrite-plated Film

Nobuhiro Matsushita, Masanori Abe, Koichi Kondo, Shigeyoshi Yoshida

Research output: Contribution to journalArticlepeer-review


Two types of conducted noise suppressors, which dissipate noise current energy before radiated as noise waves, were developed using Ni-Zn ferrite films synthesized from an aqueous solution. In the “sheet type,” Ni-Zn ferrite films of 5 µm thickness were deposited on polyimide sheets. In the “direct-deposition type,” the films were deposited directly on to the microstrip line fabricated on printed circuit board (PCB). The transmission loss ΔPloss per thickness for the “sheet type” and “direct-deposition type” were 16 and 20 times larger, respectively, than that for commercialized composite noise suppressing sheets. Both types of ferrite-film noise suppressors exhibited reflection coefficient Sn small enough (< −10 dB) to be applied as conducted noise suppressors up to 10 GHz.

Original languageEnglish
Pages (from-to)22-24
Number of pages3
JournalThe transactions of the Institute of Electrical Engineers of Japan.A
Issue number1
Publication statusPublished - 2005
Externally publishedYes


  • Ferrite-film noise suppressors

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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