Siemens Telecommunicazioni S.p.a.

Gte Telecommunicazioni, S.p.a.

Paolo Bonato

An image suppression harmonic frequency converter capable of operating in any microwave range is described. Frequency conversion is obtained by making use of a local frequency which is half that of a conventional converter. In particular, the radiofrequency reception signal is converted into an intermediate frequency signal with suppression of the converted image band. Similarly, the intermediate frequency signal to be transmitted is converted into a single side band radiofrequency transmission signal. The converter comprises two harmonic mixers, a first inquadrature radiofrequency hybrid coupler, a second in-quadrature intermediate frequency hybrid coupler, two appropriate duplexer filters, two low-pass filters, two matching circuits, and two decoupling circuits.

Image suppression harmonic frequency converter operating in the

Two harmonic mixers arranged in parallel are connected to a first signal frequency gate and to a second local frequency gate by means of a single radiofrequency hybrid circuit in quadrature or by means of respective hybrid circuits of which one in quadrature and centered on the signal frequency and the other in phase, quadrature or opposition of phase and centered on the local frequency. Another intermediate frequency hybrid circuit in quadrature connects the two mixers to a third intermediate frequency gate and to a fourth gate closable on a termination. In this manner there is obtained a harmonic frequency conversion with image suppression.

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Milan, Italy

Paolo Bonato