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Asymmetric Coupled-Line Directional Couplers as Impedance Transformers in Balanced and n -Way Power Amplifiers

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2 Author(s)
Wincza, K. ; Fac. of Electr. Eng. Automatics, Inf. Technol. & Electron., AGH Univ. of Sci. & Technol., Cracow, Poland ; Gruszczynski, S.

Asymmetric 3-dB coupled-line directional couplers for application in balanced circuits have been considered, and it has been theoretically shown that such couplers allow for simultaneous (equal) power division and impedance transformation. A limitation on achievable impedance ratio has been derived. The theoretical analysis has been experimentally verified by the measurements of a number of passive circuits and an exemplary application of the proposed circuits in a four-way power amplifier has been shown.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:59 ,  Issue: 7 )