Device for modulating a microwave signal, transponder including such a device, and responder beacon equipped with such a transponder
AssigneeThales
InventorsPatrick Garrec, Thibaut Despoisse, Anthony Ghiotto
Life of this patent
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Abstract
The modulation includes in amplifying the microwave signal phase shifted by a given angle into a first sinusoidal signal, in order to obtain a first amplified signal; and in amplifying the microwave signal phase shifted by the given angle increased by π into a second sinusoidal signal phase shifted by π with respect to the first signal, in order to obtain a second amplified signal phase shifted by π with respect to the first amplified signal; the modulated microwave signal being the sum of the first amplified signal and the second amplified signal.
Claims15
A device for modulating a microwave signal, wherein it comprises at least:
- a circuit for generating a rectified sinusoidal signal;
- a phase-shifting circuit able to receive as input said microwave signal comprising:
- a first channel applying a given phase shift;
- a second channel applying said given phase shift increased by π;
- a variable-gain amplifier the gain of which is controlled by said rectified sinusoidal signal;
- a switch controlled by said rectified sinusoidal signal, able to alternatively switch said first channel and said second channel to the input of said amplifier, the switch from one channel to the next being performed on each passage through 0 of said rectified sinusoidal signal, the output signal of said amplifier being the modulated microwave signal.
A device for modulating a microwave signal wherein it comprises at least:
- a circuit for generating a first sinusoidal signal and a second sinusoidal signal that is phase shifted by π with respect to said first signal;
- a first channel, able to receive as input said microwave frequency signal, comprising a first phase-shifter that applies a given phase shift and a first variable-gain amplifier the gain of which is controlled by said first sinusoidal signal;
- a second channel, able to receive as input said microwave frequency signal, comprising a second phase-shifter that applies said given phase shift increased by π and a second variable-gain amplifier the gain of which is controlled by said second sinusoidal signal;
- an adder that sums the signal output from said first amplifier and the signal output from said second amplifier;
- the signal output from said adder, resulting from the summation of said output signals, being the modulated signal.
Dependencies are inferred from the claim text.