A metasurface-based evanescent amplification and propagation conversion for enhancing radiation from an electrically small radiator

Author:

Sarin, V. Pushpakaran  Vinesh, R. V.  Mani, Manoj  Chandroth, Aanandan  Pezholil, Mohanan  Kesavath, Vasudevan  

Journal:

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING

Issue Date:

2019

Abstract(summary):

Achieving super-resolution beyond the diffraction limit is an intriguing research topic over the last century. In this paper, the split-ring resonator array-based evanescent amplification in the microwave regime is implemented for strongly enhancing radiation from an electrically small radiator. The electrically small radiator considered here is a chip inductor loaded open coplanar waveguide antenna. This weakly radiating source when placed in the vicinity of split-ring resonator array, it is seen that the radiated power could be greatly enhanced. The split-ring resonator array working under the magnetic resonant excitation could amplify evanescent fields emitted by the source. Field probing reveals that the split-ring resonator array could convert the amplified evanescent waves into propagating ones resulting in significantly enhanced radiation from the source.