26 
(b) Rectangular Area 
Applying equation (6) to the rectangle (fig. 8) 
aA fo)? 
R= [ | me y))\ exp jz[x(cosa- cosas )ty(cos8- cosB, ) 
JOO ald 
a Nahe ae) 
+o(x, y)(cosy(x, y)-1)] | dxdy 
Plxo; Yo, Zo ) 
yx, y) 
o(x, y) 
x 
Figure 8. Source and a rectangular array. 
Again, evaluation of the above double integral does not 
give a closed form solution. However if D--, and if 
E(x, y) = constant 
GA 102 
exp ji[x(cosa- cosa, )+y(cosB-cosB, )] | dxdy 
