Metamaterials with Gain Compensation by Active Devices

Case ID:

This invention is an effective gain medium that overcompensates for the loss of a conventional passive metamaterial, meanwhile keeping its original negative-index property. This material can be used to solve the critical challenge current metamaterial technology faces in practical applications.


Using energy conservation-based theory, full-wave simulation and experimental measurement, the inventors have shown that a fabricated sample consisting of conventional sub-wavelength building blocks with embedded microwave tunnel diodes exhibits a band-limited Lorentzian dispersion simultaneously with a negative refractive index and a net gain.



  • Super lensing
  • Electromagnetic invisibility
  • RF communications
  • Military technology
  • Sonar aversion
  • Radar aversion
  • Potential for use in deep sea water


  • Overcompensates for passive losses of radiation due to dispersion
  • Easily manufactured
  • Requires materials that are readily available
  • Exhibits versatility across numerous applications

Status: issued U.S. patent #10,431,897

Patent Information:
Contact For More Information:
Tariq Ahmed
Sr Licensing Manager, College of Engineering
The University of Arizona
Lead Inventor(s):
Hao Xin
Qi Tang
Adnan Kantemur