SLM Printed Waveguide Dual-Mode Filters With Reduced Sensitivity to Fabrication Imperfections

This letter presents an eighth-order dual-mode waveguide filter, fabricated using the selective laser melting (SLM) technique. The filter employs four dimpled ellipsoid dual-mode resonators, operating at the fundamental TM 101 mode. During printing, the filter can be mechanically self-supported with...

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Bibliographic Details
Published inIEEE microwave and wireless components letters Vol. 31; no. 11; pp. 1195 - 1198
Main Authors Wen, Xiaozhu, Guo, Cheng, Shang, Xiaobang, Yu, Yang, Shu, Minjie, Yang, Qian, Li, Sheng, Attallah, Moataz M., Liu, Hongzhong, Zhang, Anxue
Format Journal Article
LanguageEnglish
Published IEEE 01.11.2021
Subjects
3-D printing
Band-pass filters
dual mode filter
ellipsoid resonator filter
Filtering theory
Microwave filters
Microwave theory and techniques
Resonator filters
Resonators
selective laser melting (SLM) printing
Tuning
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Summary:This letter presents an eighth-order dual-mode waveguide filter, fabricated using the selective laser melting (SLM) technique. The filter employs four dimpled ellipsoid dual-mode resonators, operating at the fundamental TM 101 mode. During printing, the filter can be mechanically self-supported without any internal supports. Compared to the filters employing tuning posts, the proposed filter is less sensitive to fabrication errors in terms of their impacts on passband return loss (RL), frequency shift, and bandwidth. The filter was demonstrated at WR-112 band (7-10 GHz), with a measured insertion loss of 0.25-0.4 dB and an RL >15 dB across the passband of 8-8.46 GHz.
ISSN:1531-1309
1558-1764
DOI:10.1109/LMWC.2021.3096977