Accession Number : ADD015575

Title :   Frequency Dispersive Transmitting Array.

Descriptive Note : Patent, Filed 3 Sep 91, patented 22 Sep 92,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Sullivan, Shelby F ; Gordon, Frank E ; Castile, D

Report Date : 22 Sep 1992

Pagination or Media Count : 17

Abstract : A Frequency Dispersive Transmitting Array for propagating composite wave energy emulates narrow-band beams of different frequencies which can be simultaneously radiated in all directions, or in any subset of directions, relative to an array of radiating elements because of the addition and cancellation of components of wave energy radiated, is disclosed. A signal source provides input signals, having frequencies which may be acoustic or electromagnetic, which are coupled by feedline to radiating elements through a plurality of time delay devices. Each one of time delay devices is interposed between successive ones of radiating elements and delays emission of replicas of signals therefrom by a time delay tau which is a multiple of the period of the dominant frequency radiated in a direction broadside to the array.

Descriptors :   *SONAR ARRAYS, *PATENTS, *WAVE PROPAGATION, *SOUND WAVES, ACOUSTICS, ADDITION, ARRAYS, CANCELLATION, DELAY, EMISSION, ENERGY, FREQUENCY, INPUT, REPLICAS, SIGNALS, TIME, TRANSMITTING, RADIATION, SCHEMATIC DIAGRAMS, SONAR ECHOES, SONAR TRANSDUCERS

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE