Electromagnetic Wave Propagation in a Sandwich Structure Containing Single-Negative Metamaterial

In this paper, the transmission property and mechanism of a sandwich structure constructed by μ-negative (MNG) material, air and ε-negative (ENG) material is investigated. First, the transmission properties of the MNG-Air-ENG sandwich structure is theoretically studied and it is illustrated that, under certain condition, electromagnetic wave can efficiently transmit through the MNG-Air-ENG sandwich structure and the electric and magnetic field is interestingly localized at the interface of MNG-Air and ENG-Air respectively, Which makes the composite structure important for potential application in free-space communication and other relative fields. In addition, the transmission mechanism is also explored and the results show that the MNG-Air-ENG sandwich structure can be regarded as an air cavity resonator with single-negative metamaterial reflectors.