Development of high quality factor inductor using magnetic particle with insulated surface film / dielectric composite core for UHF band

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K18047
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Electron device/Electronic equipment
• Research Institution: Shinshu University
• Principal Investigator: SONEHARA Makoto 信州大学, 学術研究院工学系, 准教授 (30456496)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: RFインダクタ / 複合材料 / 磁性微粒子 / 絶縁被覆 / 性能指数 / 近接効果 / インダクタンス値 / UHF帯

Outline of Final Research Achievements

The iron based magnetic particles with surface oxide film heat-treated in the air were filled as a magnetic core between the windings of the RF spiral inductor. The Q-factor of the composite core inductor was 20% higher than that of the same size of the air-core inductor at 0.4 to 2.4 [GHz]. It is considered that eddy current loss in the composite material and proximity effect of the inductor can be reduced, which is a big finding.
In addition, the composite core RF inductor was used for the LC series resonance RF simulation circuit, reflection coefficient in the circuit using the composite core inductor decreased by about 0.5dB as compared with the case of the air core. The resonance half-width width in the circuit using the composite core inductor was also narrower than that of the air-core inductor case. This suggests that the resistance of the circuit was reduced, it was the most important finding of this research, its superiority was demonstrated and satisfied the initial goal.

Free Research Field

磁気工学