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A method of improving the gain of circular waveguide array antenna using one-dimensional (1-D) electromagnetic band-gap (EBG) structure is proposed in this paper. The detailed analysis is made to study the radiation characteristics of circular waveguide antenna and its array with 1-D EBG structure. The simulation and experimental results show an about 7 dB addition in the antenna gain in compared with the conventional antenna, which proves that the radiation characteristics of antenna array using EBG structure are improved. [ABSTRACT FROM AUTHOR]

A method of raising the front to back (F/B) ratio on the pattern for the slot array antenna of rectangular waveguide by using electromagnetic band-gap (EBG) structure as a high-impedance ground plane is studied in this paper. The benefits of using such an EBG structure are related to the suppression of surface waves excited by the slots of waveguide. In agreement with the expected results, the simulation and experimental radiation patterns show that the EBG structure can increase the front radiation, decrease the back radiation and improve the gain of slot array antenna. [ABSTRACT FROM AUTHOR]