Abstract: A new type of antenna based on high impedance surface(HIS) and corrugated groove is proposed to solve the problem of big sidelobes and narrow gain bandwidth in Fabry-Perot(FP) resonant antenna for limited size. Simultaneously, the traditional FP resonant antenna, loading periodic structure and the aperiodic HIS arrays and corrugated groove structures are numerical analyzed by CST software. The measured and simulation results show that compared with the traditional resonant structure, the gain of the new structure can be improved only in a narrow band after loading periodic HIS arrays and corrugated groove, however, after loading a periodic HIS arrays and corrugated groove, the gain is increased in a wider bandwidth and the gain stability is much better.