Title :
A new microstrip pickup coil for thin-film permeance meters
Author :
Kawazu, T. ; Yamaguchi, M. ; Arai, K.I.
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
fDate :
11/1/1994 12:00:00 AM
Abstract :
In this paper we propose an application of microstrip line for a single-turn pickup coil in the thin-film permeance meters. This coil has two electric ports with one terminated into 50 Ω. It is free from LC resonance up to a few GHz because the microstrip line does not resonates and because the stray capacitance between the pickup coil and the driving sheets is small as compared with the conventional figure-8 coil. We measured the thin film permeance up to 700 MHz which is the upper frequency limit of the driving sheets used. The proposed coil has a potential to measure thin-film permeances over the wide range from 1 MHz up to a few GHz
Keywords :
coils; electric sensing devices; magnetic permeability measurement; magnetic thin films; microstrip components; 1 MHz to 3 GHz; 50 ohm; 700 MHz; LC resonance; driving sheets; equivalent circuit; figure-8 coil; frequency characteristics; magnetic recording heads; microstrip line; microstrip pickup coil; single-turn pickup coil; thin film permeance; thin-film permeance meters; Capacitance; Coils; Equivalent circuits; Frequency measurement; Leg; Magnetic field measurement; Microstrip; Permeability; Resonance; Transistors;
Journal_Title :
Magnetics, IEEE Transactions on
