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Modes of the contrawound toroidal helix antenna
Author(s) -
Hansen R. C.,
Ridgley Richard
Publication year - 1999
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/(sici)1098-2760(19991220)23:6<365::aid-mop14>3.0.co;2-s
Subject(s) - helical antenna , toroid , radiation pattern , dipole antenna , dipole , physics , antenna (radio) , loop antenna , optics , omnidirectional antenna , moment (physics) , microwave , mode (computer interface) , radiation , coaxial antenna , electrical engineering , engineering , computer science , classical mechanics , plasma , quantum mechanics , operating system
The contrawound toroidal helix antenna with constant current is examined; it has an omnidirectional pattern in the toroid plane. Radiation resistance is derived for the dipole mode, and results are validated by moment‐method calculations. The radiation Qs of these antennas are greater than one million, making them unsuitable as dipole mode radiators. Ratios of loop‐mode to dipole‐mode radiation resistances range from several hundred to large values. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 23: 365–368, 1999.