Broadband low-grating-lobe array grids

Abstract

The need for planar phased arrays capable of operating over an octave band with two-plane scan out to 30 deg. has led to fresh ways to array the elements in grids and to suppress the level of peak grating lobes. With these grids the maximum size of the element is set only by considerations of scan loss so the number of elements may be reduced to about a third of that of a conventional triangular grid array with interelement spacings set to avoid grating lobes in array visible space.