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Small antenna input impedances that contradict Chu-Wheeler Q criterion

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2 Author(s)
Underhill, ; Centre for Solid State Electron., Univ. of Surrey, Guildford, UK ; Harper, M.

Analysis of the small tuned folded dipole input impedance gives a limiting bandwidth proportional to frequency and antenna dimension. A simple antenna mode expansion also directly contradicts the Chu-Wheeler Q criterion. A line-integral potential method gives an additional logarithmic Q reduction factor. Untuned field sensors may have additional coupling losses.

Published in:

Electronics Letters  (Volume:39 ,  Issue: 11 )