X-Band Air-Filled Coaxial Bandpass Filter With Wideband Input-Reflectionless Performance

doi:10.1002/mop.70092

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	X-Band Air-Filled Coaxial Bandpass Filter With Wideband Input-Reflectionless Performance
	Li, Zhe Ming 1; He, Ying Qian 1; Lin, Jing Yu 2; Zhang, Zhi Cong 3; Zhang, Xiao 1; Zhu, Lei4 ; Wong, Sai Wai 1
	2025
Source Publication	Microwave and Optical Technology Letters
ISSN	0895-2477
Volume	67 Issue:1
Abstract	Reflectionless bandpass filters (BPF) have been realized in the waveguide and planar circuits; however, the literature does not report reflectionless air-filled coaxial BPF. In this article, an X-band input-reflectionless air-filled coaxial BPF is presented. The proposed filter has two transmission zeros (TZs) at the lower and upper stopband, respectively, to improve the selectivity. An equivalent circuit of this filter is provided to explain its reflectionless filtering response, which contains a BPF section and a bandstop filter (BSF) section. For verification, a reflectionless BPF centered at 10.2 GHz with an in-band fractional bandwidth (FBW) of 6.39% has been designed and fabricated. The frequency range of measured 10-dB return loss is from 4.75 to 13.00 GHz (10-dB-absorption FBW of 80.9%), showing a very attractive wideband reflectionless filtering behavior.
Keyword	absorptive filter air-filled coaxial waveguide bandpass filter (BPF) closed-form formulas input-reflectionless filter
DOI	10.1002/mop.70092
URL	View the original
Language	英語English
Scopus ID	2-s2.0-85214413961
Fulltext Access	View Full-Text via DOI View Full-Text via Web of Science View Full-Text via Scopus
Citation statistics
Document Type	Journal article
Collection	DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
Affiliation	1.State Key Laboratory of Radio Frequency Heterogeneous Integration, College of Electronics and Information Engineering, Shenzhen University, Shenzhen, Guangdong, China 2.Institute of Electromagnetics and Acoustics, Xiamen University, Xiamen, Fujian, China 3.College of Electronic and Information Engineering, Jinggangshan University, Ji'an, China 4.Department of Electrical and Computer Engineering, Faculty of Science and Technology, University of Macau, Macao
Recommended Citation GB/T 7714	Li, Zhe Ming,He, Ying Qian,Lin, Jing Yu,et al. X-Band Air-Filled Coaxial Bandpass Filter With Wideband Input-Reflectionless Performance[J]. Microwave and Optical Technology Letters, 2025, 67(1).
APA	Li, Zhe Ming., He, Ying Qian., Lin, Jing Yu., Zhang, Zhi Cong., Zhang, Xiao., Zhu, Lei., & Wong, Sai Wai (2025). X-Band Air-Filled Coaxial Bandpass Filter With Wideband Input-Reflectionless Performance. Microwave and Optical Technology Letters, 67(1).
MLA	Li, Zhe Ming,et al."X-Band Air-Filled Coaxial Bandpass Filter With Wideband Input-Reflectionless Performance".Microwave and Optical Technology Letters 67.1(2025).

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