Non-foster circuit matching of a near-field resonant parasitic, electrically small antenna

Jeffrey S. Roberts, Richard W Ziolkowski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


The impedance bandwidth of a near-field resonant parasitic (NFRP) element of an electrically small, metamaterial-inspired Egyptian Axe Dipole (EAD) antenna, can be altered significantly by embedding a non-Foster circuit element into it. The frequency agile behavior of the reactance component internal to the NFRP element of an EAD antenna with a center frequency of 300 MHz is established and a negative impedance converter (NIC) circuit is designed to mimic this behavior. Several other non-Foster circuits have been considered for the NIC implementation and will be discussed in our presentation. A Linvill-based design of the requisite NIC, which contains 4 bipolar junction transistors (BJTs), is presented here. ANSYS HFSS was used for the antenna simulation results; Agilent ADS was used for the circuit simulations. The co-designed, optimized results show an increase in the EAD fractional impedance bandwidth from 0.9% to 46.0%, a factor of over 50 times improvement.

Original languageEnglish (US)
Title of host publication2015 International Workshop on Antenna Technology, iWAT 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages3
ISBN (Print)9781479977178
StatePublished - Dec 23 2015
EventInternational Workshop on Antenna Technology, iWAT 2015 - Seoul, Korea, Republic of
Duration: Mar 4 2015Mar 6 2015


OtherInternational Workshop on Antenna Technology, iWAT 2015
Country/TerritoryKorea, Republic of


  • Electrically small antennas
  • metamaterials
  • negative impedance converters
  • non-Foster circuits

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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