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Browse Prior Art Database

Single Harmonic Self Steering Phased Array

IP.com Disclosure Number: IPCOM000091468D
Original Publication Date: 1968-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 3 page(s) / 52K

Publishing Venue

IBM

Related People

Muehldorf, EI: AUTHOR

Abstract

This method connects antenna elements and amplifiers such that essentially a single amplifier can be used for amplification of the signals in the connection of all pairs of antenna elements of a retrodirective phased array.

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Single Harmonic Self Steering Phased Array

This method connects antenna elements and amplifiers such that essentially a single amplifier can be used for amplification of the signals in the connection of all pairs of antenna elements of a retrodirective phased array.

A measurement of the phase difference of the signal received by antenna elements 1 and 2 is performed. This is done by mixing the incoming signals at the respective frequency and phases f/O and f/psi with a local oscillator signal f(1)/O and its first harmonic 2f
(1)/O. Local oscillator LO and the doubler D(1) produce the necessary signals. The signals resulting from the mixing process are at frequency and phase (f-f(1))/O and (f-2f(1))/psi. They are amplified in amplifiers A(p1) and A(p2) and then mixed again in the mixer M(p).

The resulting signal is at frequency and phase f(1)/psi. This signal feeds harmonic generator D(2) which produces 2f(1)/2 psi.

The three signals f(1)/0, f(1) psi, and 2f(1)/2 psi are used to produce the signals f(1)/2 psi, f(1)/3 psi...f(1)/(n-1)psi required for the conversion. This is done by the way of mixers M"(1), M"(2), etc. The signal 2f(1)/2 psi is mixed in mixer M"(1) with f(1)/0 which produces f(1)/2 psi. This is mixed in mixer M"(2) with f(1)/psi which produces 2f(1)/3 psi. This signal is mixed in mixer M"(3) with f(1)/0 which produces f(1)/3 psi. This process is carried out repeatedly so that after each second mixer the signals of frequency f(1) appear, but with one more increment psi added to the phase.

The signals of frequency f(1) with the phases psi, 2 psi...(n-1)psi are used for down-converting the incoming signals. All down-converted signals are coherent and are added for IF amplification in one single amplifier. The signals f(1)/psi, f(1)/2 psi, etc., are also used for up-converting the amplified signal, giving them the proper phasing such that they add coherently into the direction from which the phase front arrives.

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