Fabrication and characterization of a solenoid-type microtransformer

Richard J. Rassel; C. Fred Hiatt; John DeCramer; Stephen A. Campbell

doi:10.1109/tmag.2002.806341

Fabrication and characterization of a solenoid-type microtransformer

Richard J. Rassel, C. Fred Hiatt, John DeCramer, Stephen A. Campbell

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

Solenoid-type microtransformers were fabricated by using a photo-definable thick photoresist and through-hole plating techniques to allow three-dimensional multilayer fabrication of the coils. Primary and secondary coils have a low-frequency inductance of 100 and 80 nH, respectively. Flux leakage is a serious problem on devices with coils on opposite sides of the toroid. Interleaved coils, however, have a coupling constant of 0.9 before falling off at frequencies above 500 kHz. The inductance begins to roll off at about 50 kHz because of core effects. The design has an insertion loss of -19.5 dB at 10 MHz.

Original language	English (US)
Pages (from-to)	553-558
Number of pages	6
Journal	IEEE Transactions on Magnetics
Volume	39
Issue number	2 II
DOIs	https://doi.org/10.1109/tmag.2002.806341
State	Published - Jan 2003

Keywords

Inductors
Magnetic cores
Micromachining
Transformers

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AB - Solenoid-type microtransformers were fabricated by using a photo-definable thick photoresist and through-hole plating techniques to allow three-dimensional multilayer fabrication of the coils. Primary and secondary coils have a low-frequency inductance of 100 and 80 nH, respectively. Flux leakage is a serious problem on devices with coils on opposite sides of the toroid. Interleaved coils, however, have a coupling constant of 0.9 before falling off at frequencies above 500 kHz. The inductance begins to roll off at about 50 kHz because of core effects. The design has an insertion loss of -19.5 dB at 10 MHz.

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Fabrication and characterization of a solenoid-type microtransformer

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