Active microwave negative-index metamaterial transmission line with gain

Tao Jiang, Kihun Chang, Li Ming Si, Lixin Ran, Hao Xin

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


We studied the active metamaterial transmission line at microwave frequency. The active composite right-handed or left-handed transmission line was designed to incorporate a germanium tunnel diode with a negative differential resistance property as the gain device at the unit cell level. Measurements of the fabricated planar transmission line structures with one-, two-, and three-unit cells showed that the addition of the dc pumped tunnel diodes not only provided gain but also maintained the left handedness of the transmission line metamaterial. Simulation results agree well with experimental observation. This work demonstrated that negative index material can be obtained with a net gain when an external source is incorporated.

Original languageEnglish (US)
Article number205503
JournalPhysical review letters
Issue number20
StatePublished - Nov 11 2011

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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