Open AccessComposite defect electromagnetic band gap cavity
Author(s) -
Ningfeng Bai,
Hong Wei,
Xiaoyan Sun
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.018401
Subject(s) - rod , composite number , mode (computer interface) , photonic crystal , lattice (music) , materials science , band gap , optics , physics , optoelectronics , acoustics , computer science , composite material , medicine , alternative medicine , pathology , operating system
We demonstrate an approach to create a high Q factor two-dimensional (2D) electromagnetic band gap (EBG) structure with composite defects in the center of the structures. By theoretical calculation, we show that a single-mode 2D EBG structure can be created with different ratios of diameter, d, to the lattice period, Λ, in this structure. This structure can achieve high Q factor and single mode operation with large d/Λ of the defect at the first circle around the removed rod in the center. With our structure, the single mode operation can be achieved within d/Λat the defect rods and d/Λat the others. In comparison, the condition of d/Λ should be strictly satisfied for the traditional design. These results provide very important guidelines for designing of the 2D EBG structure which can be used in traveling-wave tube device.