Abstract
A coaxial-cable impedance transformer used in wideband frequency range is generally restricted to the fixed impedance transformation ratio as n2:1 or 1:n2(n: the number of coaxial cables). In this paper, we propose a new coaxial-cable impedance transformer to have an arbitrary impedance transformation ratio. We have fabricated three impedance transformers(50-Ω to 25-Ω, 50-Ω to 20-Ω and 50-Ω to 9-Ω) to confirm the operation characteristic of the suggested impedance transformer. The reflection characteristics (S11) of the fabricated 50-Ω to 25Ω and 50-Ω to 20-Ω impedance transformer were less than -15dB over about 3-octaves frequency range and the reflection characteristic (S11) of the fabricated 50-Ω to 9-Ω impedance transformer was less than -15dB over about 1-octave frequency range, respectively.
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