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 Journal of the Korean Institute of Electromagnetic and Science 2005;5(4):208-212.
 Harmonic Suppression and Broadening Bandwidth of Band Pass Filter Using Aperture and Photonic Band Gap Structure Chul-Hun Seo School of Electronic Engineering, Soongsil University Abstract In this paper, we introduced a band-pass filter employed the PBG structure and the aperture on the ground together. The harmonics of band pass filter have been suppressed by employing the PBG structure and the bandwidth of it has been broadened by using the aperture on the ground. The designed PBG cells have three different sizes. The largest cells, the middle cells, and the smallest cells have suppressed the multiple of second harmonics, the multiple of third harmonics, and the multiple of fifth harmonics, respectively. The center frequency has been 2.18 GHz. The bandwidth has been increased from 230 MHz up to 310 MHz(80 MHz, about $35%$) by the aperture and the ripple characteristics in passband have been improved and the harmonic frequencies have been suppressed about 30 dB by the PBG. Key words: PBG, Band Pass Filter, Aperture, Harmonic Suppression
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