Equivalent Circuit Model Analysis of Electromagnetic Metasurface Loaded With Plasma

An equivalent circuit model (ECM) is proposed for a Jerusalem cross metasurface structure loaded with plasma. Based on the microwave network theory, the electromagnetic properties of the composite structure are analyzed through this ECM. Due to the wave-absorbing effect of plasma, the parallel conductive and inductive elements are introduced to the ECM of the Jerusalem cross metasurface, forming the ECM of the composite structure. The circuit element parameters are extracted by genetic algorithm optimization. The consistency between the simulated reflection coefficient and the calculated ones by this model proves the accuracy of the proposed ECM for analyzing the electromagnetic properties of a composite structure. Moreover, the plasma collision frequency and the plasma electron density are selected within a certain frequency range to further prove the accuracy of this model. The influence of plasma parameters on the equivalent circuit element values is also analyzed. The ECM can predict the electromagnetic properties of the composite structure and provide theoretical guidance for the design.