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A 3-D printed X-band spherical waveguide filter based on the hybrid BSCT and CT topology

Published online by Cambridge University Press:  28 January 2025

Sheng Zhang ,
Hongliang Qiao Open the ORCID record for Hongliang Qiao [Opens in a new window] ,
Jiayu Rao ,
Xilong Wu  and
Enhui Zhao
Sheng Zhang
Affiliation:
School of Information and Control Engineering, China University of Mining and Technology, Xuzhou, China
Hongliang Qiao*
Affiliation:
School of Information and Control Engineering, China University of Mining and Technology, Xuzhou, China
Jiayu Rao
Affiliation:
School of Electrical and Information Engineering, Jiangsu University of Technology, Changzhou, China
Xilong Wu
Affiliation:
School of Information and Control Engineering, China University of Mining and Technology, Xuzhou, China
Enhui Zhao
Affiliation:
School of Information and Control Engineering, China University of Mining and Technology, Xuzhou, China
*
Corresponding author: Hongliang Qiao; Email: ts22060004a31@cumt.edu.cn
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Abstract

In this paper, a novel dual-mode spherical resonator is proposed. By rotating the coupling irises, perturbations are generated to split the degenerate modes. The proposed filter is cascaded by a dual-mode resonator and two single-mode resonators, which are placed in a rotary way. Four poles appear in three resonators by only changing the rotation angle (φ) without any additional design. It forms the BSCT, generating a transmission zero (TZ) at the upper stopband. Furthermore, by adjusting φ further, the CT coupling topology can be obtained, resulting in a TZ at the lower stopband. Finally, slots are etched on the surface of the resonators for spurious response suppression. With the above methods, the out-of-band selectivity and suppression are greatly improved. For the fast validation, the filter is 3-D printed and measured. As a result, the measured results match well with the simulated ones.

Keywords

3-D printingdual-modespherical resonator
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 16 , Issue 8 , October 2024 , pp. 1423 - 1430
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Copyright
© The Author(s), 2025. Published by Cambridge University Press in association with The European Microwave Association.

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