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Resonance phenomena of log-periodic antennas: characteristic-mode analysis

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3 Author(s)
Hilbert, M. ; Dept. of Electr. Eng., Toronto Univ., Ont., Canada ; Tilston, M.A. ; Balmain, K.G.

The method of characteristic modes is implemented in the form of a general-purpose computer program based on an established moment-method program using piecewise sinusoids. Application of the method to the log-periodic dipole antenna (LPDA) yields characteristic modes that are insensitive to changes in moment-method segmentation and are revealing with regard to parasitic resonance phenomena. A study of the modes on the LPDAs shows that the asymmetry resonance is dominated by a mode that is not restricted to one cell, although the single-resonant-cell postulate remains a good first-order explanation. On the other hand, the symmetric termination resonance is shown to involve more than one mode. A numerical study of various antenna deformations shows that only length extensions cause strong asymmetry resonances. The E-plane array is analyzed, and the results are shown to compare favorably with experiment

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Antennas and Propagation, IEEE Transactions on  (Volume:37 ,  Issue: 10 )