Affiliations: [a] School of Electronic Engineering, Dongguan University
of Technology, Dongguan, Guangdong, China | [b] Institute of Photoelectronics, Southwest Jiaotong
University, Chengdu, Sichuan, China
Correspondence:
[*]
Corresponding author: Ying-Xin Lai, School of Electronic
Engineering, Dongguan University of Technology, Campus Road No.1, Songshan Lake
District, Dongguan, Guangdong 523808, China. Tel.: +86 0769 22861886; Fax: +86
0769 22862182; E-mail: [email protected]
Abstract: By making use of coupled-wave theory, the transmission
characteristics of a defected coaxial Bragg structure which operates in the
vicinity of 100 GHz are investigated. Results reveal that the overmoded
operation of the example structure excites serious interaction among the
operating mode and its neighboring modes, which spoils the passband structure
and causes hybrid-mode transmission. However, single-mode output can be ensured
by applying Hamming-window-function distribution to the ripple amplitude of the
example structure, and one or more desired narrow passbands can be generated
and controlled by adjusting the localized ripple defect or/and the initial
phase difference between the outer-wall and the inner-rod ripples. These
peculiarities provide potential applications of defected coaxial Bragg
waveguides in constructing high-Q open resonators and narrow passband filters
in the sub-terahertz and terahertz frequency ranges.
