This becomes 
e/(OL IL é in(20 = mn 
oe COSA )) sin( (cosR- COSBo )) 
+ (cosa- COSA, ) + (coss- COs, ) 
or normalized, 
: \ ; ~ 
sin( 2 (cosa- COSao )) sin(—"(coss- cose, )) 
Ry = 2 5 (13) 
7 (cosa- COSdo ) <"(cos8- cosa, ) 
If, however, the direction (cosa,, cos, cosy, ) had not been 
compensated for, the directivity function would have been 
new AGI ~ _ (bor \ 
e ee : sin( "oss ) 
My S eosa cose 
R 
which is equation(30)of reference 1, page 37. It is also 
possible to obtain this equation from equation (9) by letting 
VV, d,7a and Nzd2,-b as VW, 7, Nz>0. This is the manner in 
which Stenzel derives the above equation. 
(c) Solid Rectangular Parallelepiped (fig. 9) 
The directivity function for a solid rectangular parallele- 
piped is, from equation (7), 
a b Cc 
2 2 2 
R = ; [ Pale Us cifexpjet ose COSA, ) 
an Oh -d Ie 
+y (cos8 - cOS8, )+z (cosy- cosy) 
+o(x, y, z) (cosy (x, y, z)-1) || dxdydz 
27 
