Electromagnetic (EM) simulation of electromagnetic band gap (EBG) structures is computationally expensive when multiple iterations are required. For the first time, in this paper, a novel synthesis method for designing EBG structures has been proposed. The method consists of three major approaches: current path approximation method (CPA-Method), border to border radius (B2BR), and power loss method (PLM). CPA-Method is based on the current flow on a periodically patterned power/ground plane. CPA-Method gives a final dimension of EBG structure for a desired stop band frequency. B2BR determines the maximum number of patches implementable within a given area. PLM calculates isolation level of an EBG structure based on the transmitted power. The proposed approaches have been combined together to synthesize an EBG structure for a given specification. The synthesized EBG structure with these approaches has been fabricated and verified with EM simulation and measurement. The EBG structure has shown excellent stop band and isolation level agreements with the desired specification.