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 



E0= Hfi = r— 7- COS — (ct — To) 



CTo Sin O A 



J 



COS B cos (A COS 6) — sin B cos d sin (.-1 cos d) — cos G r (19) 



( 



where 



B = 

 A = 



2Trb 



X 



2xa 



0="^ =A + 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 -\- b = the whole length of the 

 antenna, so that 



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



FuiURE 0. 



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

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



