In order to achieve microwave broadband and high transparency materials, we have adopted a method of miniaturizing the frequency selection surface. An electromagnetically transparent material consisting of a layer of capacitive patch and a layer of Sshaped inductive grid is designed. The results show that the -1 dB relative bandwidth of this electromagnetically transparent material can reach 99.4% and the experimental results are in good agreement with the simulation results. At the same time, the oblique incidence experiment results show that the structure still has good angular stability under the incident condition of the transverse electric wave and the transverse magnetic wave with a polarized incident wave angle of 40°.