Spray-coated magnetic powder composite planar inductor for compact IoT sensor node

T. Hara, M. Yamaguchi

Research output: Contribution to journalArticlepeer-review

Abstract

A spray coating process of magnetic powder composite material is proposed in this paper for planar inductors and transformers for small DC/DC converter. This is a low temperature (≤150 °C) process that is usable for ferrites and extensively other magnetic powders and flakes. A commercially available Ni-Cu-Zn spinel ferrite particles and epoxy resin composite is applied for a 3 x 3 mm2 planer spiral inductor whose coil has 1 μm-thick, line/space =56/9 μm, and 10 turns made on a Si substrate, and exhibited inductance enhancement from from 157 nH to 205 nH (30%) without any resistance increase, up to 5 MHz. Physical stress by the proposed spray coating process can be negligible, judging from the well increased inductance and low resistance.

Original languageEnglish
Article number015333
JournalAIP Advances
Volume10
Issue number1
DOIs
Publication statusPublished - 2020 Jan 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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