Directivity Versus Horizontal and Vertical Beamwidth

Abstract

The directivity properties of many horns can be quickly determined from the nomograph shown in Figure 60. The nomograph is based on the following equation:

$$ DI = 10\log \left[ {\frac{{{{180}^{ \circ }}}}{{\arcsin \left( {\sin \frac{\alpha }{2}\bullet \sin \frac{\beta }{2}} \right)}}} \right] $$

(60.1)