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This paper presents an electromagnetic band-gap (EBG) structure in a fork-like shape. The period of the EBG lattice is only 0.07λ0 at the desired stopband frequency, resulting in the most compact EBG lattice over achieved. A comparison has been carried out between the new structure and the mushroom-like EBG structure. Simulations and experimental results have verified that the area of the fork-like structure is less than 40% of the latter. Also a double element microstrip antenna array inserted with the new EBG structure has been simulated, showing that a 6.51 dB mutual coupling reduction is achieved.