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Infinite Helical Sheath Antenna
Author(s) -
Chen Chinlin
Publication year - 1966
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1002/rds196615589
Subject(s) - physics , antenna (radio) , optics , generator (circuit theory) , phase (matter) , radiation pattern , current (fluid) , radiation , phase velocity , fourier transform , excitation , power (physics) , telecommunications , computer science , quantum mechanics , thermodynamics
An infinitely long helical sheath antenna driven by a ring delta‐function generator is considered. The Fourier transform technique is used to solve this problem. It is found that if β b < 2.4048, the current distribution far away from the driving point can be decomposed into a surface‐wave current and a radiating current. The former is constant in magnitude with a phase velocity less than the speed of light, the latter decays as 1/ z 2 and has a phase constant β. The radiation pattern of the space wave is calculated. The power radiated by the space wave, guided by the surface wave, and the efficiency of excitation of the surface wave are also determined. Numerical results are presented.