Accession Number : ADD000760
Title : Method and Apparatus for Suppressing Grating Lobes in an Electronically Scanned Antenna Array.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C
Personal Author(s) : Mailloux,Robert J ; Schell,Allan C
Report Date : 08 Apr 1975
Pagination or Media Count : 12
Abstract : The patent relates to grating lobe suppression in an electronically scanned antenna array realized by adding odd mode power to the fundamental even mode power that normally drives each radiating element of the array. The odd mode power is maintained plus or minus 90 degrees out of phase with the even mode power at each radiating element aperture. The ratio of even mode power to odd mode power is varied as a function of main beam displacement from broadside. One class of circuit for automatically accomplishing the required functions utilize waveguide power dividers and phase shifters. An alternative embodiment comprehends the use of passive, reciprocal linear circuitry to perform the power division. In some circuits the phase difference between adjacent radiating elements is used to derive odd and even mode signals.
Descriptors : *Phased arrays, *Patents, Antenna arrays, Antenna lobes, Suppression
Subject Categories : Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE