Phase angle modulator for microwaves

Details Phase angle modulator for microwaves Phase angle modulator for microwaves

1998-10-06

2000-05-09

Bettendorf, Justin P.

Wave transmission lines and networks

Coupling networks

Delay lines including long line elements

333164, H03H 720

Patent

active

060609621

ABSTRACT:
An analog phase modulator is provided for linearly phase modulating a high carrier frequency input signal in proportion to an applied bias signal. A first variable reactance network, including at least a pair of variable reactance devices separated by an approximately 1/4 wave length transmission line segment, is capacitively coupled to an in-phase port of a power divider network, and a second identical variable reactance network is capacitively coupled to a quadrature phase shifted port of the power divider network. A bias source signal is applied to each of the first and second variable reactance networks through identical bias filters, each including a high impedance transmission line segment serially connected between the bias source and the variable reactance network, and a low impedance transmission line segment shunt segment at the juncture of the high impedance transmission line segment and the bias source input port.

REFERENCES:
patent: 3436691 (1969-04-01), Hoffman et al.
patent: 3768045 (1973-10-01), Chung
patent: 3914708 (1975-10-01), Stover et al.
patent: 4638269 (1987-01-01), Dawson et al.
patent: 5014018 (1991-05-01), Rodwell et al.
patent: 5557140 (1996-09-01), Nguyen et al.

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