Istituto di Scienza e Tecnologie dell'Informazione     
Denoth F., Pellegrini B. A transistorized directional coupler. In: IEEE International Conference on Communication (Minneapolis, USA, 1967). Proceedings, p. 165. IEEE, 1967.
In this paper is described a directional coupler in which the analogical reconstruction of the backward wave is obtained by means of a transistor. The use of an active element has allowed one to obtain at the same time a broad band, a high directiyity and a tight coupling. The use of such a coupler in a bidirectional broad band amplifier is also proposed.

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