On the maximum backscattering cross section of passive linear arrays

The maximum backscattering cross section of an equispaced linear array connected to a reactive network and consisting of isotropic radiators is calculated for
n = 2, 3
, and 4 elements as a function of the incident angle and of the distance between the elements. On the basis of the results obtained, some conjectures pertaining to the general
n
-element array are presented.