3-D Printed In-Line Coaxial Filter and Diplexer Design Using Dual-Mode Coupled Stubs Resonator

Jiayu Rao; Zhaoyang Li; Guohong Dai; Jian Wu; Jiasheng Hong

doi:10.1109/LMWT.2026.3713684

3-D Printed In-Line Coaxial Filter and Diplexer Design Using Dual-Mode Coupled Stubs Resonator

Jiayu Rao^*
, Zhaoyang Li
, Guohong Dai
, Jian Wu
, Jiasheng Hong

^*Corresponding author for this work

School of Engineering & Physical Sciences

Research output: Contribution to journal › Article › peer-review

Abstract

This letter introduces a dual-mode coupled stub resonator (DM-CSR), which can be manipulated to exhibit nondegenerate dual-mode features. The DM-CSR is then used to design a box-section topology in-line coaxial four-pole filter with the two controllable transmission zeros (TZs). Subsequently, a diplexer was designed for the first time based on the filter’s topology. Coupling windows were introduced to individually fulfill adjust external quality factor (Q_e). Multiple TZs were generated for the diplexer, which obtained a high isolation degree of over 40 dB. A 3-D metal printing solution was used to fabricate both components; the tested results matched well with the simulated ones.

Original language	English
Journal	IEEE Microwave and Wireless Technology Letters
DOIs	https://doi.org/10.1109/LMWT.2026.3713684
Publication status	E-pub ahead of print - 23 Jul 2026

Keywords

3-D metal printing
box-section topology filters
coaxial diplexer
in-line coaxial filter

ASJC Scopus subject areas

Condensed Matter Physics
Electrical and Electronic Engineering

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10.1109/LMWT.2026.3713684

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title = "3-D Printed In-Line Coaxial Filter and Diplexer Design Using Dual-Mode Coupled Stubs Resonator",

abstract = "This letter introduces a dual-mode coupled stub resonator (DM-CSR), which can be manipulated to exhibit nondegenerate dual-mode features. The DM-CSR is then used to design a box-section topology in-line coaxial four-pole filter with the two controllable transmission zeros (TZs). Subsequently, a diplexer was designed for the first time based on the filter{\textquoteright}s topology. Coupling windows were introduced to individually fulfill adjust external quality factor (Qe). Multiple TZs were generated for the diplexer, which obtained a high isolation degree of over 40 dB. A 3-D metal printing solution was used to fabricate both components; the tested results matched well with the simulated ones.",

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author = "Jiayu Rao and Zhaoyang Li and Guohong Dai and Jian Wu and Jiasheng Hong",

note = "Publisher Copyright: {\textcopyright} 2023 IEEE.",

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day = "23",

doi = "10.1109/LMWT.2026.3713684",

language = "English",

journal = "IEEE Microwave and Wireless Technology Letters",

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AU - Li, Zhaoyang

AU - Dai, Guohong

AU - Wu, Jian

AU - Hong, Jiasheng

PY - 2026/7/23

Y1 - 2026/7/23

N2 - This letter introduces a dual-mode coupled stub resonator (DM-CSR), which can be manipulated to exhibit nondegenerate dual-mode features. The DM-CSR is then used to design a box-section topology in-line coaxial four-pole filter with the two controllable transmission zeros (TZs). Subsequently, a diplexer was designed for the first time based on the filter’s topology. Coupling windows were introduced to individually fulfill adjust external quality factor (Qe). Multiple TZs were generated for the diplexer, which obtained a high isolation degree of over 40 dB. A 3-D metal printing solution was used to fabricate both components; the tested results matched well with the simulated ones.

AB - This letter introduces a dual-mode coupled stub resonator (DM-CSR), which can be manipulated to exhibit nondegenerate dual-mode features. The DM-CSR is then used to design a box-section topology in-line coaxial four-pole filter with the two controllable transmission zeros (TZs). Subsequently, a diplexer was designed for the first time based on the filter’s topology. Coupling windows were introduced to individually fulfill adjust external quality factor (Qe). Multiple TZs were generated for the diplexer, which obtained a high isolation degree of over 40 dB. A 3-D metal printing solution was used to fabricate both components; the tested results matched well with the simulated ones.

KW - 3-D metal printing

KW - box-section topology filters

KW - coaxial diplexer

KW - in-line coaxial filter

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DO - 10.1109/LMWT.2026.3713684

M3 - Article

AN - SCOPUS:105045758187

SN - 2771-957X

JO - IEEE Microwave and Wireless Technology Letters

JF - IEEE Microwave and Wireless Technology Letters

ER -

3-D Printed In-Line Coaxial Filter and Diplexer Design Using Dual-Mode Coupled Stubs Resonator

Abstract

Keywords

ASJC Scopus subject areas

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