US 5,703,531 AGranted

Predistortion linearizer and method employing uniplanar Magic T hybrids

AssigneeHughes Aicraft Company

InventorsSteven A. Vaughn, James A. Verkade

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Abstract

Operating on the principle of vector summation, a predistortion linearizer includes a signal divider on one side of a substrate plate that divides a microwave signal into a linear portion and a nonlinear portion. Signal energy on both the nonlinear and linear portions is coupled into two respective slotline transmission lines on the substrate by uniplanar Magic T hybrids. As the signals are transmitted along the slotlines, their relative amplitudes and phases are adjusted to introduce a distortion inverse to that expected in a subsequent amplification. The linear portion and nonlinear portion pass through another pair of baluns. The signals are then combined by an in-phase summation on the same side of the plate as the input signal divider.

Claims18

Dependent claims

A predistortion linearizer, comprising:

a dielectric plate substrate having a metallic layer on a single side thereof, the plate having a longitudinal axis lying in the plane of the plate and a transverse axis lying in the plane of the plate and perpendicular to the longitudinal axis, there being a first transverse direction and an oppositely disposed second transverse direction perpendicular to the longitudinal axis;
a signal divider on a top side of the plate substrate, the signal divider having a signal divider input, a signal divider output first leg parallel to the longitudinal axis, and a signal divider output second leg parallel to the longitudinal axis;
a signal combiner on the top side of the plate substrate, the signal combiner having a signal combiner input first leg parallel to the longitudinal axis, a signal combiner input second leg parallel to the longitudinal axis, and a signal combiner output;
a first slotline formed in the metallic layer on the top side of the plate substrate, the first slotline representing the signal divider output first leg in the first transverse direction and representing the signal combiner input first leg in the first transverse direction;
a second slotline formed in the metallic layer on the top side of the plate substrate, the second slotline representing the signal divider output second leg in the second transverse direction and representing the signal combiner input second leg in the first transverse direction;
and
means for adjusting the relative phase and amplitude of signals transmitted along the first slotline and the second slotline.

4 more elements

A predistortion linearizer, comprising:

a dielectric plate substrate having a metallic layer on a top side thereof;
a linearizer signal input and a linearizer signal output on a top side of the plate substrate;
a signal divider on the top side of the plate substrate, the signal divider having a signal divider input in electrical communication with the linearizer signal input, a signal divider output first leg, and a signal divider output second leg;
a signal combiner on the top side of the plate substrate, the signal combiner having a signal combiner input first leg, a signal combiner input second leg, and a signal combiner output in electrical communication with the linearizer signal output;
a first slotline formed through the metallic layer on the top side of the plate substrate and extending from a first slotline first end in registry with the signal divider output first leg to a first slotline second end in registry with the signal combiner input first leg;
a second slotline formed through the metallic layer on the top side of the plate substrate and extending from a second slotline first end in registry with the signal divider output second leg to a second slotline second end in registry with the signal combiner input second leg;
and
means for adjusting the relative phase and amplitude of signals transmitted along the first slotline and the second slotline.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/703,166Filed 28 Aug 1996 · continuation in part
Priority: 7 Jun 1995
Granted: 30 Dec 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

H03F 1/3241
Modifications of amplifiers to reduce non-linear distortion: using predistortion circuits
H03F 2200/198
Indexing scheme relating to amplifiers: a hybrid coupler being used as coupling circuit between stages of an amplifier circuit
H03F
Amplifiers

Family

Serial476,967Parent of this continuation-in-part · filed 7 Jun 1995
US 5,703,531 AThis patent

From the US filing history. Foreign family members aren’t listed.

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