RADIATION CHARACTERISTICS OF AN ANTENNA. 



201 



This expression may be integrated by the formulas 360 and 361 

 of B. O. Pierce's Short Table of Integrals and gives 



Ee= H^= ^— cos — {d — ro) 



cro smd X 



cos B cos {A cos 6) — sin B cos d sin (.4 cos 6) — cos G \ (19) 



f 



where 



B = 



A = 

 G = 



2irh 

 X 



27ra 

 X 



ttXq 



.1 + B 



(20) 



The quantity h, which is the length of the flat top, gets into (20) 

 and (19) by reason of the fact that a -\- h = the whole length of the 

 antenna, so that 



Xo = 4 (a + h). (21) 



Figure G. 



Equation {19), with the notation of equations {20) and {21) is the 

 general equation for the electric and magnetic Intensities at any point P, 



