Tuning effect analysis of cylindrical dielectric-loaded resonators

✍ Scribed by Yinchao Chen; Qunsheng Cao; Kunquan Sun; Benjamin Beker; Raj Mittra

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 289 KB
• Volume: 15
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(19970620)15:3<127::aid-mop3>3.0.co;2-i

✦ Synopsis

In this article we analyze the resonant characteristics of cylindrical dielectric-loaded resonators based on a two-dimensional cylin-(

) drical finite-difference᎐time-domain method 2D-CFDTD . First, we ¨alidate our approach by comparing the computed data for a specified structure with that a¨ailable in the literature with the use of other techniques, and we obser¨e good agreement. Second, we study the tuning effects of two resonator configurations: those with a tuning screw and those with a capped tuning screw. In computer experiments, we ha¨e ( ) found two interesting phenomena: i the length of turning screw can significantly affect the resonant frequencies up to 15% for only a short ( ) ¨ariation of the screw tuning length, and ii the resonant frequencies of TE and TM modes exhibit different tendencies when the screw tuning lengths of structures are changed. Finally, we in¨estigate the field distributions inside the resonators by combining the 2D-CFDTD with the discrete Fourier transform, and we ha¨e found that the tuning can lead to a large alteration of the electromagnetic fields inside the structures.