17G THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1956 



7?, 2.5 



Fig. 4.1.5 — The radial propagation constants associated with the transverse 

 and longitudinal modes on coupled coa.xial sheath helices given as a function of 



/3oa cot i/-! when hi a = 3.0. 



and for the outer helix 

 For complete power transfer we ask that 



•J hi — J hi 



when Jo is zero at the input {z = 0) 

 or 



Jbt _ Jbt 



J at J at 



\ 



(36) \ 



(37) 



