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Resonant contrawound toroidal helix antenna
Author(s) -
Hansen R. C.
Publication year - 2001
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/mop.1192
Subject(s) - reactance , helical antenna , bandwidth (computing) , resonance (particle physics) , physics , electrical impedance , loop antenna , toroid , microwave , ohm , omnidirectional antenna , electrical engineering , engineering , antenna (radio) , acoustics , coaxial antenna , telecommunications , atomic physics , voltage , plasma , quantum mechanics
The resonant CWTHA is examined via a moment‐method simulation. The results show a very high impedance at first resonance with a narrow bandwidth and low efficiency. At second resonance, the resistance is less than an ohm, the reactance is zero, and again, the bandwidth is narrow. The azimuth patterns are not omnidirectional, but may have a dip of 10 dB or more. The simulation shows a loop‐mode cancellation of at least 140 dB. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 29: 408–410, 2001.