. The Bell System technical journal . 2,0 Fig. — The radial propagation constants associated with the transverseand longitudinal modes on coupled coaxial sheath helices given as a finiclion of0oa cot \{/i when b/a = i COUPLED HELICES 175 7a. /Oo <3 COT ^, Fig. — The radial propagation constants associated with the transverseand longitudinal modes on coupled coaxial sheath helices given as a function of/3oa cot yp\ when 6/a = III. COMPLETE POWER TRANSFER For coupled applications we require the coupled helix parame-ters to be

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. The Bell System technical journal . 2,0 Fig. — The radial propagation constants associated with the transverseand longitudinal modes on coupled coaxial sheath helices given as a finiclion of0oa cot \{/i when b/a = i COUPLED HELICES 175 7a. /Oo <3 COT ^, Fig. — The radial propagation constants associated with the transverseand longitudinal modes on coupled coaxial sheath helices given as a function of/3oa cot yp\ when 6/a = III. COMPLETE POWER TRANSFER For coupled applications we require the coupled helix parame-ters to be adjusted so that RF power fed into one helix alone will set upthe transverse and longitudinal modes equal in amplitude. For thiscondition the power from the outer helix will transfer completely to theinner helix. The total current density can be written as the sum of thecurrent in the longitudinal mode and the transverse mode. Thus for theinner helix we have -i&li J a = Jate- + Jate .-J^<2 (35) 17G THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1956 7?,

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