228 



BELL SYSTEM TECHNICAL JOURNAL 



X 



CURRENT ELEMENT 

 (LENGTH i METERS) 

 (i<< A) 



MAGNETIC INTENSITY^H, 



le -^~T^ 



— -e ^ 5IN9 



L KV 



AMPERES 

 METER 



ELECTRIC INTENSITY = Eg = 120TrH<(, ^ ^^^ 



I I fr^l'^ p WATTS 



POWER FLOW =P = |H4,Ee| = 30^^— J SIN'^e y^^^^^ Z 



o ■ r. .^ fr^l^ WATTS 



P 15 MAXIMUM FOR 6=90. ce., P^^ =30Tr|^— J -jj^^r^z 



U) 

 (i) 



POWER FLOW ACROSS SPHERE OF RADIUS r OR 



r^ n -61 ^ 



TOTAL RADIATION = W =/ P2TTr SINS rde = 80Tt2 I yJ WATTS (s) 



,2 



(6) 



(7) 



RADIATION RESISTANCE = R r^q " T? " ^°'" TJ ^^^^ 



BY (4) AND (5) : P 



MAX anr^ 



W 



WATTS 

 METERS 



Fig. 5 — Free Space Radiation from a Small Current Element with Uniform Current 

 I Amperes over its Entire Length. 



this element is centered at the origin of a rectangular coordinate system 

 and that it lies along the Z axis. At a large distance r from the element 



