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

Ning Zhu, Richard W. Ziolkowski

Research output: Contribution to journalArticlepeer-review

55 Scopus citations


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.

Original languageEnglish (US)
Article number6305461
Pages (from-to)1116-1120
Number of pages5
JournalIEEE Antennas and Wireless Propagation Letters
StatePublished - 2012


  • Broadband antennas
  • Chu-Thal limit
  • Electrically small antennas (ESAs)
  • Metamaterial-inspired antennas
  • Non-Foster elements

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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