Abstract
This paper presents the design and analysis of general baluns of Marchand-type with a transmission line connected between two sections. A series of new expressions of S-parameters are derived for such type of Marchand balun. The relations between the length of interconnected transmission line and the imbalance of Marchand balun are discussed. By using analytical method, a millimeter-wave Marchand balun was designed and simulated by the full-wave electromagnetic software HFSS, and fabricated in 0.15 µm pHEMT GaAs process. The measurement results show that the balun achieves low insertion loss and good balance in the band of 24–40 GHz. The results are in good agreement with the simulated ones. The theoretical analysis is verified.
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