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Applications of a Chirping and Tapering Technique on Photonic Band-Gap(PBG) Structures for Bandwidth Improvement  

Tong Ming-Sze (School of Electrical and Electronics Engineering, Chung-Ang University)
Kim Hyeong-Seok (School of Electrical and Electronics Engineering, Chung-Ang University)
Chang Tae-Gyu (School of Electrical and Electronics Engineering, Chung-Ang University)
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Abstract
Microwave or optical photonic band-gap(PBG) structures are conventionally realized by cascading distributive elements in a periodic pattern. However, the frequency bandwidth obtained through such plainly periodic arrangement is typically narrow, corporate with a relatively high rejection side-lobe band. To alleviate such problems, a design involving a chirping and tapering technique is hence introduced and employed. The design has been applied in both a planar stratified dielectric medium as well as a strip-line transmission line structure, and results are validated when compared with the corresponding conventional PBG structure.
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