Phase angle modulator for microwaves
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United States of America Patent
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May 9, 2000
Issued Date -
N/A
app pub date -
Oct 6, 1998
filing date -
Aug 2, 1997
priority date (Note) -
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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.
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