Microwave and Optical Technology Letters

RESEARCH ARTICLE

High-Frequency Selectivity Coaxial Multiplexer Using Chain Structure

Corresponding Author

Kaijun Song

[email protected]

EHF Key Laboratory of Fundamental Science, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China

Correspondence: Kaijun Song ([email protected])

Search for more papers by this author

Min Liu,

Min Liu

orcid.org/0009-0001-5018-7876

EHF Key Laboratory of Fundamental Science, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China

Search for more papers by this author

Parama Kumarage Aresha Madhubhani,

Parama Kumarage Aresha Madhubhani

EHF Key Laboratory of Fundamental Science, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China

Search for more papers by this author

Yong Fan,

Yong Fan

EHF Key Laboratory of Fundamental Science, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China

Search for more papers by this author

Kaijun Song,

Corresponding Author

Kaijun Song

[email protected]

EHF Key Laboratory of Fundamental Science, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China

Correspondence: Kaijun Song ([email protected])

Search for more papers by this author

Min Liu,

Min Liu

orcid.org/0009-0001-5018-7876

EHF Key Laboratory of Fundamental Science, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China

Search for more papers by this author

Parama Kumarage Aresha Madhubhani,

Parama Kumarage Aresha Madhubhani

EHF Key Laboratory of Fundamental Science, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China

Search for more papers by this author

Yong Fan,

Yong Fan

EHF Key Laboratory of Fundamental Science, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China

Search for more papers by this author

First published: 10 July 2025

https://doi.org/10.1002/mop.70287

Share a link

Email
Wechat
Bluesky

ABSTRACT

This paper presents a chain-structured coaxial multiplexer with high-frequency selectivity, which employs a coaxial resonant cavity structure. The cavity filter achieves ultrahigh frequency selectivity and excellent passband flatness by establishing a parameter mapping framework between the circuit model and full-wave electromagnetic simulation. The multiplexer is widely used as a passive component in existing mobile communication systems. Experimental results demonstrate that the multiplexer exhibits excellent performance, with insertion loss below 0.9 dB and return loss exceeding 20 dB across the 3, 4.8, 7.2, and 7.8 GHz frequency bands.

Open Research

Data Availability Statement

The authors have nothing to report.

References

1M. L. Chuang and M. T. Wu, “Microstrip Diplexer Design Using Common T-Shaped Resonator,” IEEE Microwave and Wireless Components Letters 21, no. 11 (2011): 583–585.
10.1109/LMWC.2011.2168949
Web of Science® Google Scholar
2E. A. Ogbodo, F. Ngobigha, N. Obadiah Ali, and S. Atuba, “A Diplexer With Direct Coupled Resonant Junction,” Microwave and Optical Technology Letters 63, no. 6 (2021): 1677–1681.
10.1002/mop.32787
Web of Science® Google Scholar
3M. Ma, B. Zhang, and Y. A. Feng, “300-330 GHz Symmetrical Duplexer Based on Chebyshev Narrowband Bandpass Filter,” in International Conference on Microwave and Millimeter Wave Technology (2023), 1–3.
Google Scholar
4E. Guerrero, P. Silveira, J. Verdu, Y. Yang, S. Gong, and P. de Paco, “A Synthesis Approach to Acoustic Wave Ladder Filters and Duplexers Starting With Shunt Resonator,” IEEE Transactions on Microwave Theory and Techniques 69, no. 1 (2021): 629–638.
10.1109/TMTT.2020.3033554
Web of Science® Google Scholar
5X. Juan, Z. Li, and R. Chen, “Optimization of a Novel Substrate Integrated Waveguide High-Pass Filter Using Space Mapping,” Microwave and Optical Technology Letters 57, no. 3 (2015): 733–737.
10.1002/mop.28945
Web of Science® Google Scholar
6X. Zhao, O. Glubokov, J. Campion, et al., “Silicon Micromachined D-Band Diplexer Using Releasable Filling Structure Technique,” IEEE Transactions on Microwave Theory and Techniques 68, no. 8 (2020): 3448–3460.
10.1109/TMTT.2020.3004585
Web of Science® Google Scholar
7M. Li, F. Feng, W. Zhang, J. Jin, K. X. Ma, and Q. J. Zhang, “ Space Mapping Optimization Using Coarse-fine Mesh for the H-Plane Waveguide Filter,” in IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications. IEEE, 2022), 1–3.
Google Scholar
8L. Accatino and M. Mongiardo, “Hybrid Circuit-Full-Wave Computer-Aided Design of a Manifold Multiplexers Without Tuning Elements,” IEEE Transactions on Microwave Theory and Techniques 50, no. 9 (2002): 2044–2047.
10.1109/TMTT.2002.802340
Web of Science® Google Scholar
9C. Perez-Wences, J. R. Loo-Yau, I. Lavandera-Hernandez, P. Moreno, A. J. Reynoso-Hernandez, and L. M. Aguilar-Lobo, “Compact Microstrip Lowpass-Bandpass Diplexer Using Radial Stubs,” Microwave and Optical Technology Letters 61, no. 2 (2019): 485–489.
10.1002/mop.31582
Web of Science® Google Scholar
10C. Zhu and J. Zhang, “Design of Diplexer-Integrated Filtering Power Divider With High Isolation,” Microwave and Optical Technology Letters 61, no. 11 (2019): 2607–2613.
10.1002/mop.31937
Web of Science® Google Scholar
11T. Kojima, A. Gonzalez, S. Asayama, and Y. Uzawa, “Design and Development of a Hybrid-Coupled Waveguide Multiplexer for a Multiband Receiver,” IEEE Transactions on Terahertz Science and Technology 7, no. 1 (2016): 1–10.
10.1109/TTHZ.2016.2627220
Google Scholar
12D. Wolanský and T. Roman, “Coaxial Filters Optimization Using Tuning Space Mapping in CST Studio,” Radio Engineering 20, no. 1 (2011): 289.
Google Scholar
13S. Koziel, J. W. Bandler, and K. Madsen, “A Space-Mapping Framework for Engineering Optimization—Theory and Implementation,” IEEE Transactions on Microwave Theory and Techniques 54, no. 10 (2006): 3721–3730.
10.1109/TMTT.2006.882894
Web of Science® Google Scholar
14Q. S. Cheng, J. W. Bandler, and S. Koziel, “Tuning Space Mapping: The State of the Art,” International Journal of RF and Microwave Computer-Aided Engineering 22, no. 6 (2012): 639–651.
10.1002/mmce.20621
Web of Science® Google Scholar
15G. Pan, Y. Wu, M. Yu, L. Fu, and H. Li, “Inverse Modeling for Filters Using a Regularized Deep Neural Network Approach,” IEEE Microwave and Wireless Components Letters 30, no. 5 (2020): 457–460.
10.1109/LMWC.2020.2986156
Web of Science® Google Scholar
16J. Chen, L. Li, T. Su, and Y. Chen, “Highly Efficient Method to Calculate S-Parameters of Microwave Filter and Duplexer From Coupling Matrix,” International Journal of RF and Microwave Computer-Aided Engineering 32, no. 3 (2022): e23032.
10.1002/mmce.23032
Web of Science® Google Scholar
17M. F. Hagag, M. Abu Khater, M. D. Hickle, and D. Peroulis, “Tunable SIW Cavity-Based Dual-Mode Diplexers With Various Single-Ended and Balanced Ports,” IEEE Transactions on Microwave Theory and Techniques 66, no. 3 (2018): 1238–1248.
10.1109/TMTT.2017.2777978
Web of Science® Google Scholar
18Z.-M. Li, Y.-Q. He, J.-Y. Lin, et al., “X-Band Air-Filled Coaxial Bandpass Filter With Wideband Input-Reflectionless Performance,” Microwave and Optical Technology Letters 67, no. 1 (2025): e70092.
10.1002/mop.70092
Web of Science® Google Scholar
19D. V. N. Evani, H. Modi, S. Singh, and K. S. Parikh, “A Simple Method to Design Dielectric Resonator-Based Filters and Diplexers Using Implicit Space Mapping Technique,” International Journal of RF and Microwave Computer-Aided Engineering 24, no. 2 (2014): 204–216.
10.1002/mmce.20750
Web of Science® Google Scholar

Volume67, Issue7

July 2025

e70287

High-Frequency Selectivity Coaxial Multiplexer Using Chain Structure

ABSTRACT

Open Research

Data Availability Statement

References

References

Information

About Wiley Online Library

Help & Support

Opportunities

Connect with Wiley

High-Frequency Selectivity Coaxial Multiplexer Using Chain Structure

ABSTRACT

Open Research

Data Availability Statement

References

References

Related

Information