A Realistic Distributed Circuit Model for EBG Structures Based on Physical Implementations

In this paper a new equivalent circuit for the EBG structure which represent the feature of surface-wave suppression is proposed. The equivalent circuit of the EBG unit cell consists of capacitors, inductors and transmission lines of series branches, as well as a capacitor and an inductor of shunt branch. These equivalent circuit parameters are based on physical implementations of EBG structures. Therefore it is easer to extract the parameters than conventional equivalent circuits. Also, the proposed equivalent circuit can calculate a large-scale EBG structure characteristic without a long computation time although the constitution is simple.