Resonance phenomena of log-periodic antennas: characteristic-mode analysis
- 1 January 1989
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Antennas and Propagation
- Vol. 37 (10) , 1224-1234
- https://doi.org/10.1109/8.43530
Abstract
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.Keywords
This publication has 5 references indexed in Scilit:
- Reduction of the anomalous resonances of symmetric log-periodic dipole antennasIEEE Transactions on Antennas and Propagation, 1986
- On prediction of the asymmetry resonance phenomenon of log-periodic dipole antennasCanadian Electrical Engineering Journal, 1981
- Asymmetry phenomenon of log-periodic dipole antennasIEEE Transactions on Antennas and Propagation, 1976
- Study of compressed log-periodic dipole antennasIEEE Transactions on Antennas and Propagation, 1970
- Mutual coupling between log-periodic antennasIEEE Transactions on Antennas and Propagation, 1970