Pirelli & C. S. P. a.

Fabrizio Gatti

Vincenzo Boffa

Alfredo Ruscitto

Paolo Semenzato

Giuseppe Grassano

Giorgio Bertin

Luciano Accatino

Luca Risi

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 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

Fabrizio Gatti