An efficient, electrically small antenna with large impedance bandwidth simultaneously with high directivity and large front-to-back ratio

Richard W. Ziolkowski, Ming Chun Tang, Ning Zhu

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

4 Scopus citations

Abstract

Non-Foster element-augmented, electrically small electric and magnetic antennas have been designed, characterized numerically, fabricated and tested. Specifically tailored broad bandwidth inductive and capacitive devices were introduced into the near-field resonant parasitic (NFRP) components of their narrow bandwidth counter-parts. This internal non-Foster element approach led to nearly complete matching of the entire system to a 50 ω source without any matching network and high radiation efficiencies over a 10dB fractional bandwidth that surpasses the fundamental passive bound. By including additional resonant parasitic elements, one can also enhance the directivity. Further augmentation of those parasitic elements with a non-Foster device leads to a large directivity bandwidth. A 300 MHz design with ka = 0.94 is reported which simultaneously achieves high radiation efficiencies (>81.63%), high directivity (> 6.25 dB) and large front-to-back-ratios (> 26.71 dB) over a 10.0% fractional bandwidth.

Original languageEnglish (US)
Title of host publication2013 International Symposium on Electromagnetic Theory, EMTS 2013 - Proceedings
Pages885-887
Number of pages3
StatePublished - Sep 4 2013
Event2013 21st International Symposium on Electromagnetic Theory, EMTS 2013 - Hiroshima, Japan
Duration: May 20 2013May 24 2013

Publication series

Name2013 International Symposium on Electromagnetic Theory, EMTS 2013 - Proceedings

Other

Other2013 21st International Symposium on Electromagnetic Theory, EMTS 2013
CountryJapan
CityHiroshima
Period5/20/135/24/13

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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