Alcatel Espace

Alcatel

Regis Barbaste

Bernard Cogo

Albert Cerro

Joel Larroque

Jean Louis Cazaux

Florence Labarre

Theron Bernard

Walter Zoccarato

A digital device for controlling the amplitude and the phase of a radio frequency signal includes a variable digital attenuator, a variable digital phase-shifter, and a distributor having one input and two outputs for dividing the radio frequency signal into a first signal part and a second signal part. A digital amplitude control first channel connected to an output of the distributor includes the variable digital attenuator for controlling the amplitude of the first signal part. A digital phase control second channel connected to the other output of the distributor in parallel with the first digital control channel includes the variable digital phase-shifter for controlling the phase of the second signal part. A recombiner has one output and two inputs respectively connected to the outputs of the two digital control channels and recombines the controlled two signal parts. Such devices include predistortion linearizers.

Device for controlling the amplitude and the phase of a radio frequency signal

A microwave equalizer is used in aerospace applications to correct the gain/frequency response of a microwave system, in particular in a given range of temperatures. To obtain a variation opposite to that of the microwave system by introducing absorption at the operating frequency, it comprises at least one microwave coupler one branch of which has an active device fitted at each of its two ends so that variation in the device parameters enables displacement of the absorption frequency and optionally power. The coupler(s) are coupled to a transmission line of the system and a control circuit.

Microwave equalizer suitable for aerospace applications

A device for measuring a multipactor effect in microwave systems includes a first coupler, a vacuum enclosure where a sample under test is enclosed, and a second coupler, all in series between an input which receives incident power and an output which delivers output power. The device also includes a mixer operated as a phase detector having a first input connected to an output of the first coupler to sample part of the input power via a first attenuator and a phase-shifter and a second input connected to an output of the second coupler to sample a part of the output power via a second attenuator. The output of the mixer is connected to a noise measuring device.

Multipactor effect measurement device using phase noise

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Portet, France

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