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Analysis of the loop-coupled log-periodic dipole array

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2 Author(s)
Tranquilla, J. ; University of New Brunswick, Fredericton, NB, Canada ; Balmain, K.G.

A simple theoretical model is described to analyze the loop-coupled log-periodic dipole antenna (LPDA). Computed and experimental data are presented, comprising an investigation into both the far field and the dipole and feeder currents, for a wide range of antenna parameters. Particular attention is paid to a class of parasitic resonances characterized in the swept-frequency radiation pattern by a narrow-band reduction in front-to-back ratio. The calculations show that these resonances involve high out-of-phase currents in adjacent dipole elements, and also predict correctly their dependence on the nature and location of the feedline termination. Design data are presented showing how gain and front-to-back ratio can be optimized and parasitic resonance effects minimized.

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Antennas and Propagation, IEEE Transactions on  (Volume:31 ,  Issue: 2 )