Vector modulator using amplitude invariant phase shifter

Details Vector modulator using amplitude invariant phase shifter Vector modulator using amplitude invariant phase shifter

2005-02-08

2005-02-08

Ghayour, Mohammed (Department: 2631)

Pulse or digital communications

Transmitters

Angle modulation

C375S353000

Reexamination Certificate

active

06853691

ABSTRACT:
A vector modulator is disclosed which includes a first amplitude invariant phase shifter for shifting a phase of a received signal at fixed intervals within a preset first shifting range and a quadrature hybrid coupler for separating an output of the first amplitude invariant phase shifter into at least two different channel signals having a 90° phase difference to each other. A second amplitude invariant phase shifter shifts a phase of a first channel signal among outputs of the quadrature hybrid coupler by a fixed amplitude within a prescribed second shifting range and a third amplitude invariant phase shifter shifts a phase of a second channel signal among outputs of the quadrature hybrid coupler by a fixed amplitude within a prescribed third shifting range. A combiner receives signals for the second and third invariant phase shifters and calculates a vector sum, allowing for a vector of a modulated signal on all regions of a polar coordinate system by expanding a range of variation of a received RF signal.

REFERENCES:
patent: 5119399 (1992-06-01), Santos et al.
patent: 5760646 (1998-06-01), Belcher et al.
patent: 5852389 (1998-12-01), Kumar et al.

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