%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%?Figure?4.10?&?4.11
%?Beampattern?of?uniformly?weighted?rectangular?array						
%?Xiaomin?Lu?11/2/98	
%?Updated?by?K.?Bell?9/29/00
%?Updated?by?Lillian?Xiaolan?Xu?02/12/2001?K.?Bell?9/30/01
%?Function?called:?sinc
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%?Description:
%????Redrawing?of?Figure?4.10?
%?Parameters:
%????N=M=10?dx?=?dy?=?lambda/2??betax?=?betay?=?0

close?all
clear?all

N?=?10;
M?=?10;

[uxuy]?=?meshgrid（-1:1/80:1）;
psix?=?pi*ux;
psiy?=?pi*uy;

Beam?=?sinc（1/pi*N*psix/2）./sinc（1/pi*psix/2）;
Beam?=?Beam.*sinc（1/pi*M*psiy/2）./sinc（1/pi*psiy/2）;
Be