Microwave phase modulator having a quadrature path with phase of

Details Microwave phase modulator having a quadrature path with phase of Microwave phase modulator having a quadrature path with phase of

1989-12-04

1990-11-06

Grimm, Siegfried H.

Modulators

Phase modulator

Including amplitude modulator

455110, H03C 304, H03C 340

Patent

active

049689568

ABSTRACT:
Apparatus, and a method for its use, for linearly phase-modulating a microwave signal with only minimal accompanying amplitude modulation. An incoming signal is divided into two components, one of which is shifted by ninety degrees from the other, plus or minus a small offset phase angle selected to minimize amplitude variations in an output signal. The component with the offset phase angle is amplitude modulated, then recombined with the other component to provide the desired phase-modulated output signal. When the offset phase angle and the nominal amplitude of the amplitude-modulated component are appropriately selected, phase modulation of the output signal is substantially linearly related to the amplitude modulation of the offset input signal, and amplitude modulation of the output signal is minimized.

REFERENCES:
patent: 3755739 (1973-08-01), Okano
patent: 4216542 (1980-08-01), Hermesmeyer
patent: 4338579 (1982-07-01), Rhodes
patent: 4540958 (1985-09-01), Neyens et al.
patent: 4612518 (1986-09-01), Gans et al.
patent: 4613976 (1986-09-01), Sewerinson et al.
patent: 4672634 (1987-06-01), Chung et al.
patent: 4680775 (1987-07-01), Exarque et al.
patent: 4726039 (1988-02-01), Piesinger
patent: 4736170 (1988-04-01), Wu et al.
patent: 4788509 (1988-11-01), Bahl et al.
patent: 4881049 (1989-11-01), Yagi

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