TY - GEN
T1 - Shaping and Slotting High-Q Spherical Resonators for Suppression of Higher Order Modes
AU - Guo, Cheng
AU - Li, Jin
AU - Yu, Yang
AU - Zhang, Fan
AU - Li, Sheng
AU - Attallah, Moataz M.
AU - Shang, Xiaobang
AU - Zhang, Anxue
AU - Wang, Yi
AU - Lancaster, Michael J.
PY - 2019/6
Y1 - 2019/6
N2 - This paper proposes two methods to improve the spurious-free stopband range for high-quality-factor spherical resonators and a new family of shaped spherical resonators are presented. Geometrical shaping of the proposed resonators is realized by symmetrically squeezing a spherical cavity and further opening a rectangular slot in each squeezed area. The higher order modes of the resonator are first tuned spectrally farther away from the dominant mode by the squeezing, and then are suppressed by the slotting. X-band resonator prototypes are designed, and 3-D printed by using a metallic selective laser melting technique. Quality factors of the fabricated resonators are further improved by vibration grinding process. The experiment validates effective suppression of the first higher order mode and indicates potential applications of the proposed resonators in bandpass filters to extend the spurious-free stopband bandwidths.
AB - This paper proposes two methods to improve the spurious-free stopband range for high-quality-factor spherical resonators and a new family of shaped spherical resonators are presented. Geometrical shaping of the proposed resonators is realized by symmetrically squeezing a spherical cavity and further opening a rectangular slot in each squeezed area. The higher order modes of the resonator are first tuned spectrally farther away from the dominant mode by the squeezing, and then are suppressed by the slotting. X-band resonator prototypes are designed, and 3-D printed by using a metallic selective laser melting technique. Quality factors of the fabricated resonators are further improved by vibration grinding process. The experiment validates effective suppression of the first higher order mode and indicates potential applications of the proposed resonators in bandpass filters to extend the spurious-free stopband bandwidths.
KW - Additive manufacturing
KW - high quality factor
KW - higher order mode suppression
KW - selective laser melting
KW - shaped spherical resonator
KW - slotted cavity resonator
UR - http://www.scopus.com/inward/record.url?scp=85069959937&partnerID=8YFLogxK
U2 - 10.1109/mwsym.2019.8700752
DO - 10.1109/mwsym.2019.8700752
M3 - Conference contribution
AN - SCOPUS:85069959937
T3 - IEEE MTT-S International Microwave Symposium Digest
SP - 1205
EP - 1208
BT - 2019 IEEE MTT-S International Microwave Symposium, IMS 2019
PB - Institute of Electrical and Electronics Engineers (IEEE)
T2 - 2019 IEEE MTT-S International Microwave Symposium, IMS 2019
Y2 - 2 June 2019 through 7 June 2019
ER -