Parametric Enhancement of Radiation from Electrically Small Antennas

Ahmed Mekawy, Huanan Li, Younes Radi, Andrea Alù

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Electrically small antennas are characterized by large quality factors, which yield limited gain-bandwidth products, as a result of the Bode-Fano limit. This bound implies a trade-off between the antenna's footprint and radiation features, hindering wireless applications that require compact, broadband, and efficient antennas. Here, building on a previous theoretical analysis of parametric matching networks [H. Li, A. Mekawy, and A. Alù, Phys. Rev. Lett. 123, 164102 (2019)], we demonstrate how parametric phenomena can overcome this trade-off, offering a pathway to realize stable non-Foster wideband antennas that go beyond the restrictions of passive systems. We demonstrate our approach in a planar small loop antenna loaded by a time-varying capacitor that oscillates around twice the radiation frequency, showing that it can result in wideband radiation enhancement, exceeding the limitations of passive scenarios.

Original languageEnglish (US)
Article number054063
JournalPhysical Review Applied
Issue number5
StatePublished - May 2021
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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