Forem S.p.a.

Forem S.r.l.

Massimo Rivolta

Enzo C D'Oro

Lorenzo Miglioli

A DC bias device for radio-frequency transmission systems of high power and low intermodulation connected between an originating station and a receiving station for an RF signal fed along a transmission line. Direct current is supplied from a source to the transmission line along a branch joined to the transmission line at a junction formed between the originating station and the receiving station. An open-circuit stub is formed along the transmission line between the transmitting station and the junction. A short-circuit stub is formed along the DC-supply branch between the source and the junction to the transmission line. The impedance (Zop) of the open-circuit stub, and the distance of the free heads of the near ends of the two stubs preferably is as low as possible.

DC bias device for high power, low intermodulation RF-systems

A method for increasing the directivity and adaptation of directive microwave couplers formed of two spaced apart lines, in which the length of each line is reduced to a value of less than one quarter of the operating wavelength. Capacitance is added to the coupler to counter the reduction of capacitance resulting from the shortened lines. The capacitance is added by: (1) increasing the surface area of the shortened lines by adding lateral pads; and (2) providing a dielectric bridge across the pads.

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Agrate Brianza, Italy

Massimo Rivolta