Mixed Electric and Magnetic Coupling Design Based on Coupling Matrix Extraction

doi:10.12142/ZTECOM.202304011

ZTE Communications ›› 2023, Vol. 21 ›› Issue (4): 85-90.DOI: 10.12142/ZTECOM.202304011

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Mixed Electric and Magnetic Coupling Design Based on Coupling Matrix Extraction

XIONG Zhiang¹, ZHAO Ping¹(), FAN Jiyuan¹, WU Zengqiang², GONG Hongwei²

^1.Xidian University, Xi’an 710000, China
^2.ZTE Corporation, Shenzhen 518057, China

Received:2023-04-28 Online:2023-12-25 Published:2023-12-07
About author:XIONG Zhiang received his BS degree from Jiangxi University of Science and Technology, China in 2021. He is currently pursuing his master’s degree in electromagnetic wave and microwave technology at Xidian University, China. His current research interests include mixed electric and magnetic coupling filter, and modeling and optimization of microwave passive filters.
ZHAO Ping (aoing56@gmail.com) received his BS degree from Nanjing University, China, in 2012, and PhD degree from The Chinese University of Hong Kong, China in 2017. From 2017 to 2019, he was a post-doctoral researcher with the École Polytechnique de Montréal, Canada. In 2020, he joined the National Key Laboratory of Antennas and Microwave Technology, School of Electronic Engineering, Xidian University, China, as an associate professor. His research interests include coupling matrix synthesis techniques for coupled-resonator networks, analytical computer-aided tuning (CAT) algorithms for microwave and millimeter-wave filters, and diplexers with applications in cellular base stations and satellites. He is also interested in modeling and optimization of passive RF components and computer-aided design techniques, such as the homotopy method, artificial neural networks, and machine learning techniques. He is a member of IEEE.
FAN Jiyuan received his BS degree from the Nanjing University of Posts and Telecommunications, China in 2022. He is currently pursuing the master’s degree in electro-magnetic wave and microwave technology at Xidian University, China.
WU Zengqiang received his master’s degree from Xidian Univesity, China in 2018. The same year, he joined ZTE Corporation as an assistant engineer. His current research interests include miniaturization techniques and lossless techniques of microwave filters for wireless communication, such as coaxial filter and dielectric waveguide filter.
Gong Hongwei joined ZTE Corporation as a senior engineer. His current research interests include miniaturization techniques and lossless techniques of microwave filters for wireless communication, such as the coaxial filter and the dielectric waveguide filter.
Supported by:
the National Natural Science Foundation of China(62001339)

Abstract

Abstract:

This paper proposes a design and fine-tuning method for mixed electric and magnetic coupling filters. It derives the quantitative relationship between the coupling coefficients (electric and magnetic coupling, i.e., E_C and M_C) and the linear coefficients of frequency-dependent coupling for the first time. Different from the parameter extraction technique using the bandpass circuit model, the proposed approach explicitly relatesE_C and M_C to the coupling matrix model. This paper provides a general theoretic framework for computer-aided design and tuning of a mixed electric and magnetic coupling filter based on coupling matrices. An example of a 7th-order coaxial combline filter design is given in the paper, verifying the practical value of the approach.

Key words: coupling matrix, frequency-dependent coupling, mixed electric and magnetic coupling, parameter extraction

XIONG Zhiang, ZHAO Ping, FAN Jiyuan, WU Zengqiang, GONG Hongwei. Mixed Electric and Magnetic Coupling Design Based on Coupling Matrix Extraction[J]. ZTE Communications, 2023, 21(4): 85-90.

Figures/Tables 11

References 12

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h_ridge/mm	h_plate/mm	M_ij	C_ij	TZ/rad
6.70	3.96	1.436 2	0.369 5	-3.89
6.50	3.78	1.440 9	0.355 3	-4.06
6.30	3.60	1.440 2	0.343 3	-4.20
6.10	3.43	1.443 8	0.331 8	-4.35
5.90	3.27	1.438 3	0.320 9	-4.48

h_ridge/mm	h_plate/mm	M_ij	C_ij	TZ/rad
6.70	3.96	1.436 2	0.369 5	-3.89
6.50	3.78	1.440 9	0.355 3	-4.06
6.30	3.60	1.440 2	0.343 3	-4.20
6.10	3.43	1.443 8	0.331 8	-4.35
5.90	3.27	1.438 3	0.320 9	-4.48

h_ridge/mm	h_plate/mm	M_ij	C_ij	TZ/rad
6.70	3.43	0.794 5	0.341 8	-2.32
6.50	3.50	1.097 2	0.341 8	-3.21
6.30	3.60	1.440 2	0.343 3	-4.20
6.10	3.68	1.761 0	0.343 7	-5.12
5.90	3.75	2.056 8	0.343 8	-5.98

h_ridge/mm	h_plate/mm	M_ij	C_ij	TZ/rad
6.70	3.43	0.794 5	0.341 8	-2.32
6.50	3.50	1.097 2	0.341 8	-3.21
6.30	3.60	1.440 2	0.343 3	-4.20
6.10	3.68	1.761 0	0.343 7	-5.12
5.90	3.75	2.056 8	0.343 8	-5.98

h_ridge/mm	h_plate/mm	M_ij	C_ij	TZ/rad
6.30	3.60	1.440 2	0.343 3	-4.20
6.90	3.60	0.760 1	0.353 5	-2.15
7.50	3.60	-0.029 4	0.363 0	0.08
8.10	3.60	-0.912 7	0.372 8	2.45
8.70	3.60	-1.601 0	0.397 9	4.02

Mixed Electric and Magnetic Coupling Design Based on Coupling Matrix Extraction

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Figures/Tables 11

References 12

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h_ridge/mm	h_plate/mm	M_ij	C_ij	TZ/rad
6.30	1.60	-0.958 2	0.236 2	4.06
6.30	2.10	-0.376 8	0.265 4	1.42
6.30	2.60	0.212 7	0.293 0	-0.73
6.30	3.10	0.822 3	0.318 9	-2.58
6.30	3.60	1.440 2	0.343 3	-4.20

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