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Characters of frequency response in a coaxial Bragg structure with tapered-double-sinusoidal grooves operating at 0.35 THz frequency

Authors :
Xue-Yong Ding
Hong-Rui Su
Lian-Sheng Wang
Lei Qiang
Source :
AIP Advances, Vol 11, Iss 5, Pp 055113-055113-5 (2021)
Publication Year :
2021
Publisher :
AIP Publishing LLC, 2021.

Abstract

On the basis of ordinary sinusoidal groove structures, an auxiliary sinusoidal distribution with a smaller etching period is superimposed, and a negative-taper is added, on the inner and outer conductor walls to form a coaxial Bragg structure with tapered-double-sinusoidal grooves. Through the FORTRAN software programming simulation experiments, we can see that compared with the ordinary sinusoidal grooves, the bandwidth of the working mode and competition mode gets narrower, the quality factor Q gets greater, the residual side-lobes are also suppressed, and the selectivity of frequency is enhanced when the coaxial Bragg structure adopts the tapered-double-sinusoidal grooves. At the same time, the center resonance frequency point of the competition mode is far away from the working mode, and the bandgap overlap is further separated. However, the reflectivity of the working mode decreases and the reflectivity of the competing mode increases with the increase in the gradient angle. These peculiarities of the negative-tapered-double-sinusoidal groove structure are favorable to construct a cavity with a narrower bandwidth and high quality factor and also are favorable to the mode selectivity.

Subjects

Subjects :
Physics
QC1-999

Details

Language :
English
ISSN :
21583226
Volume :
11
Issue :
5
Database :
Directory of Open Access Journals
Journal :
AIP Advances
Publication Type :
Academic Journal
Accession number :
edsdoj.feed878ed7e64bf1b238a77d1400a485
Document Type :
article
Full Text :
https://doi.org/10.1063/5.0048646