Demonstration of impedance matching using a mu-negative (MNG) metamaterial

R. B. Greegor, C. G. Parazzoli, J. A. Nielsen, M. H. Tanielian, D. C. Vier, S. Schultz, Christopher L. Holloway, Richard W. Ziolkowski

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


A mu-negative (MNG) metamaterial hemisphere was used to demonstrate impedance matching for a magnetic loop. The metamaterial was comprised of copper spirals deposited on an alumina substrate. The spirals, hemisphere, and magnetic loop were designed to operate at ∼450 MHz. The effect of the metamaterial hemisphere was to improve the match of the electrically small loop antenna to the power source impedance increasing the overall radiated power. Results show a 17-dB increase in total radiated power relative to the bare loop. This was lower than anticipated due to losses in the MNG hemisphere.

Original languageEnglish (US)
Article number4729607
Pages (from-to)92-95
Number of pages4
JournalIEEE Antennas and Wireless Propagation Letters
StatePublished - 2009


  • Antenna
  • Electrically small
  • Magnetic loop
  • Metamaterial

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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