Pirelli & C. S. P. A.

Telecom Italia S.p.a.

Giuseppe Grassano

Alfredo Ruscitto

Paolo Semenzato

Vincenzo Boffa

Bruno Melis

Franco Peruzzotti

Renata Mele

Fabrizio Gatti

Giorgio Bertin

Luciano Accatino

Michele Galbusera

Luca Risi

Fabio Roncella

Luca Gamberale

A tunable delay line for radiofrequency or microwave frequency applications consists of at least one ridge waveguide in which the ridge is movable in the waveguide body so as to vary the width of an air gap defined between the longitudinal end surface of the ridge and a confronting member of the waveguide. The ridge is moved by an actuator external to the waveguide body.

Tunable waveguide delay line having a movable ridge for providing continuous delay

A system for diversity processing two signals transmitted and/or received via two diversity antennas includes at least four respective propagation paths coupling the signals to the two diversity antennas. Diversity processing is primarily in the form of decorrelation achieved by means of time variable delay elements that apply time variable delays to the signals propagating over at least two of the propagation paths in the system. The related processing may take place either at RF or IF, or at baseband, whereby the time variable delays are applied by subjecting the baseband signals to multiplication by a complex signal.

Method and system for multiple antenna communications, related apparatus and corresponding computer program product

A system for diversity processing a signal propagated via two diversity antennas includes: respective propagation paths for propagating two replicas of the signal, these propagation paths being coupled to the two diversity antennas so that the replicas are propagated via different antennas; a time variable delay element for subjecting at least one of the replicas to a time variable delay; and a level adjusting element, such as an asymmetric splitter, to produce a level imbalance between the power levels of the replicas propagated via the two diversity antennas.

Method and system for multiple antenna communications using multiple transmission modes, related apparatus and computer program product

A differential delay element for use, e.g., in selectively delaying RF signals in telecommunication systems includes a first microstrip circuit and a second microstrip circuit arranged side-by-side in a facing relationship. The first microstrip circuit defines a first delayed travel path for a first signal from a first input port to a first output port and the second microstrip circuit defines a second delayed travel path for a second signal from a second input port to a second output port. A perturber is arranged between the first and second microstrip circuits, displaceable toward and away from the first and second microstrip circuits, so that when the distance of the perturber to one of the microstrip circuits increases, the distance of the perturber to the other of the microstrip circuits decreases and viceversa. The position of the perturber between the first and second microstrip circuits defines the differential delay, namely the difference (&#x394;&#x3c4;=&#x3c4;1&#x2212;&#x3c4;2) between the times (&#x3c4;1,&#x3c4;2) experienced by the two signals in travelling their travel paths through the delay device.

Delay element with a perturber displaceable between first and second microstrip circuits

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Milan, Italy

Giuseppe Grassano