Abstract

This paper presents Guanella type spiral transmission line transformers (TLTs) fabricated on GaAs. The operating frequency is 1 to 15 GHz and the impedance transformation ratio is 4:1, matching 12.5 /spl Omega/ and 50 /spl Omega/. Based on the commonly used TLT equivalent circuit a simple analysis of the structures is given that yields excellent agreement with measurements.

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