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A thin film spiral microstrip transmission-line using CoZrNb soft magnetic thin film for a quarter wavelength transformer

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8 Author(s)
Suzuki, H. ; Fac. of Eng., Shinshu Univ., Nagano, Japan ; Sugiyama, N. ; Sato, T. ; Yamasawa, K.
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In order to miniaturize the quarter wavelength transmission-line transformer for high frequency impedance matching, a possibility of a spiral microstrip-line structure with a magnetic/dielectric hybrid structure was investigated. For this purpose, the CoZrNb/polyimide hybrid spiral microstrip-lines with various spiral turns were fabricated and evaluated. From the results, the spiral transmission-line structure enabled to miniaturize the quarter wavelength transformer, whose insertion loss was comparable with that of a straight-line structure.

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Magnetics, IEEE Transactions on  (Volume:41 ,  Issue: 10 )