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Broad-Bandwidth, Electrically Small Antenna Augmented With an Internal Non-Foster Element

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2 Author(s)
Ning Zhu ; Dept. of Electr. & Comput. Eng., Univ. of Arizona, Tucson, AZ, USA ; Ziolkowski, R.W.

A broad-bandwidth, electrically small, near-field resonant parasitic (NFRP) dipole antenna has been designed, analyzed, and measured. Unlike conventional active external matching network approaches, a non-Foster component with a negative reactance slope was incorporated into the NFRP element of an Egyptian-axe dipole antenna to significantly increase its bandwidth. The measurement results showed approximately a 25.3 MHz 10 dB bandwidth around 300 MHz for the active system (ka=0.49), which is 6.02 and 3.89 times greater than, respectively, the simulated and measured values of the original passive design.

Published in:

Antennas and Wireless Propagation Letters, IEEE  (Volume:11 )