# US 4,398,161 A · Phase-shifting amplifier

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- Number: US 4,398,161 A
- Document ID: US4398161A
- Status: Granted
- Kind: A
- Application number: 06/253,453
- Filed: 1981-04-13
- Granted: 1983-08-09
- Earliest claimed: 1981-04-13
- Assignees: The United States of America as represented by the Secretary of the Air Force
- Inventors: Franklin D. Lamb; Steve Kiss, Jr.; Thomas K. Krueger
- Web page: https://patentgrep.com/patent/US4398161A

## CPC

- H01P 1/18: Phase-shifters (H01P1/165 takes precedence)
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)

## Abstract

A phase shifting circuit comprising a quadrature hybrid for splitting a source of signals into two paths, with an amplifier in each path and a summing hybrid for recombining the outputs from the amplifiers to produce a resultant signal. Phase shift adjustment is achieved by independently varying the gain control voltage of each amplifier.

## Claims

### Claim 1

A phased array antenna system, comprising:
a plurality of transmit/receive building block modules of electronic phase shifting circuits compensating for phase errors inherent in said system, said system including at least one microprocessor, and wherein each building block module has a source of input signals coupled to a signal splitting means;
said signal splitting means dividing said input signals into separate signal paths differing in quadrature;
amplifying means connected to said separate signal paths for amplifying the signal in each path;
said amplifying means having a control input for independently varying the gain of said amplifying means, said control means including both static anc dynamic control means;
said microprocessor being coupled via digital to analog converters to said control inputs for independently adjusting the gain of each of said amplifying means; and
signal combining means connected to said amplifying means for producing a resultant signal having a phase shift which is proportional to
tan.sup.-1 G.sub.24 /G.sub.22
where G.sub.24 and G.sub.22 are the gains for the respective amplifying means.

### Claim 2 (depends on 1)

The phased array antenna system of claim 1, wherein said amplifying means includes Field Effect Transistor amplifiers.