Ferrite thin film noise suppressor suitable for flexible printed circuit

Koichi Kondo, Hiroshi Ono, Shigeyoshi Yoshida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Conducted and radiated noise suppression effects attained by the ferrite-plated thin film of 3 μm in thickness were evaluated using the mock samples of ferrite-plated flexible printed circuits (FPCs), in order to confirm a feasibility of its application to FPCs as a novel thin film noise suppressor. Transmission loss power ratio i.e. conducted noise suppression effect was evaluated from the measured S-parameters using the flexible microstrip line of 70 mm in length up to 6 GHz. The transmission loss power ratio attained by the ferrite film increased with increasing frequency, reaching approximately 4 dB attenuation enhancement at 6 GHz. This was almost the same as the commercially-available composite-type noise suppression sheet (NSS) of 50 μm in thickness. Radiated noise suppression effect was evaluated from 0.7 GHz to 5 GHz using the radiation suppression ratio, which was defined as the transmission parameter S21 from the flexible open circuit of 1 m in length to the receiving antenna 3 m away from the circuit. The radiation suppression ratio suppressed by the ferrite film was approximately 10 dB in average at 0.7 GHz, which was effective up to 5 GHz. This was also equivalent to the composite-type NSS. These experimental results suggest that the ferrite-plated film is an effective noise suppressor for FPC, suppressing the noise currents and radiated emission up to several GHz.

Original languageEnglish
Title of host publication2015 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages524-527
Number of pages4
ISBN (Electronic)9781479966707
DOIs
Publication statusPublished - 2015 Aug 3
Externally publishedYes
EventAsia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2015 - Taipei, Taiwan, Province of China
Duration: 2015 May 252015 May 29

Publication series

Name2015 Asia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2015

Other

OtherAsia-Pacific International Symposium on Electromagnetic Compatibility, APEMC 2015
CountryTaiwan, Province of China
CityTaipei
Period15/5/2515/5/29

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Radiation

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