Design of 3-D Printed Coaxial Filter Based on Modified Two-Section Stepped Impedance Resonator

Jiayu Rao; Chao Jiang; Yang Yu; Qian Gao; Zhuo-Wei Miao; Jiasheng Hong

doi:10.1109/lmwt.2025.3564953

Design of 3-D Printed Coaxial Filter Based on Modified Two-Section Stepped Impedance Resonator

Jiayu Rao, Chao Jiang, Yang Yu, Qian Gao, Zhuo-Wei Miao, Jiasheng Hong

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Abstract

This letter proposed a kind of modified two-section coaxial stepped impedance resonator. The analysis expression was given for the first time to obtain the fundamental resonant frequency ( f₀ ). In addition, the simulated results showed that the modified resonator can achieve more compact volumes, wider spurious stopband, and higher unloaded quality ( Q_u ) factors compared to the published works. A four-pole bandpass filter was designed for validation, which presents the 2216 Q_u , 8.4 f₀ stopband range with an electrical length (EL) of ~1/15 wavelength. Direct 3-D metal printing technique was adopted to manufacture the filter for a rapid experimental demonstration. As a result, the measured results agreed well with the simulated ones.

Original language	English
Pages (from-to)	1130-1133
Number of pages	4
Journal	IEEE Microwave and Wireless Technology Letters
Volume	35
Issue number	8
Early online date	16 May 2025
DOIs	https://doi.org/10.1109/lmwt.2025.3564953
Publication status	Published - Aug 2025

Keywords

3-D metal printing
coaxial bandpass filter
two-section coaxial resonator

ASJC Scopus subject areas

Electrical and Electronic Engineering
Condensed Matter Physics

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10.1109/lmwt.2025.3564953

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title = "Design of 3-D Printed Coaxial Filter Based on Modified Two-Section Stepped Impedance Resonator",

abstract = "This letter proposed a kind of modified two-section coaxial stepped impedance resonator. The analysis expression was given for the first time to obtain the fundamental resonant frequency ( f0 ). In addition, the simulated results showed that the modified resonator can achieve more compact volumes, wider spurious stopband, and higher unloaded quality ( Qu ) factors compared to the published works. A four-pole bandpass filter was designed for validation, which presents the 2216 Qu , 8.4 f0 stopband range with an electrical length (EL) of \textasciitilde{}1/15 wavelength. Direct 3-D metal printing technique was adopted to manufacture the filter for a rapid experimental demonstration. As a result, the measured results agreed well with the simulated ones.",

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author = "Jiayu Rao and Chao Jiang and Yang Yu and Qian Gao and Zhuo-Wei Miao and Jiasheng Hong",

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AU - Yu, Yang

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AU - Miao, Zhuo-Wei

AU - Hong, Jiasheng

PY - 2025/8

Y1 - 2025/8

N2 - This letter proposed a kind of modified two-section coaxial stepped impedance resonator. The analysis expression was given for the first time to obtain the fundamental resonant frequency ( f0 ). In addition, the simulated results showed that the modified resonator can achieve more compact volumes, wider spurious stopband, and higher unloaded quality ( Qu ) factors compared to the published works. A four-pole bandpass filter was designed for validation, which presents the 2216 Qu , 8.4 f0 stopband range with an electrical length (EL) of ~1/15 wavelength. Direct 3-D metal printing technique was adopted to manufacture the filter for a rapid experimental demonstration. As a result, the measured results agreed well with the simulated ones.

AB - This letter proposed a kind of modified two-section coaxial stepped impedance resonator. The analysis expression was given for the first time to obtain the fundamental resonant frequency ( f0 ). In addition, the simulated results showed that the modified resonator can achieve more compact volumes, wider spurious stopband, and higher unloaded quality ( Qu ) factors compared to the published works. A four-pole bandpass filter was designed for validation, which presents the 2216 Qu , 8.4 f0 stopband range with an electrical length (EL) of ~1/15 wavelength. Direct 3-D metal printing technique was adopted to manufacture the filter for a rapid experimental demonstration. As a result, the measured results agreed well with the simulated ones.

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DO - 10.1109/lmwt.2025.3564953

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JO - IEEE Microwave and Wireless Technology Letters

JF - IEEE Microwave and Wireless Technology Letters

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ER -

Design of 3-D Printed Coaxial Filter Based on Modified Two-Section Stepped Impedance Resonator

Abstract

Keywords

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