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%?circular?array?beampattern
%
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clear
close?all
jay?=?sqrt（-1）;
r?=?0.25;
N?=?16;
n?=?0:1:N-1;
theta?=?[0:1:360]/180*pi;
theta_streer?=?120/180*pi;
theta_element?=?2*pi/N*（n）;
f?=?5000;
c?=?1500;
lambda?=?c/f;
phi?=?90/180*pi;
P?=?r*[cos（theta_element）.‘?