This is the equation for a linear array of / = 2m elements* 
or, if the directivity function is normalized 
) aK Kk 
es sin(/e 
Ry = By isin) 
(b) Circular Array (fig. 4) (Compensated) 
Let the circle have a radius 7. Then for a discrete set of 
elements on the circumference, the position of the it 
element is 
x. = rcosg. . = rsing. = 0 
i Di» U; D522, 
» SOURCE 
JAG 35 5 Uy 5 Bo) 
ELEMENT 
(x. y,) 
Figure 4. Source and elements of a circular array. 
*Reference 2, equation (A9), page 16. 
**Reference 1, equation (51), page 56. 
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