In order to solve the problem that the resonant frequency is too high and the structure is too large when the traditional electromagnetic band gap (EBG) structure is used in the microwave circuit. The paper is based on the equivalent theory of microwave circuit, and an EBG structure with spiral ground plane and interdigital structure is designed. In th e range of 1-10 GHz, interdigitated EBG, spiral ground EBG and interdigitated spiral ground EBG were analyzed by HFSS software. The S21 parameters were obtained and compared with each other. The results show that the band gap frequency of the three structures is 4.8GHz, 2.8GHz and 1.85GHz respectively under the same size.
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