Bandpass filter using coupled-line-stub cascaded structure with high stopband rejection

Sen Lu; Kai Da Xu; Yingjiang Guo; Yi Ren; Qiang Chen

doi:10.1002/mop.32555

Bandpass filter using coupled-line-stub cascaded structure with high stopband rejection

Sen Lu, Kai Da Xu, Yingjiang Guo, Yi Ren, Qiang Chen

ENG - Communications Engineering

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

5 Citations (Scopus)

Abstract

A compact fifth-order bandpass filter (BPF) with high stopband rejection level is proposed using a coupled-line-stub cascaded structure (CLS-CS). Based on transversal signal-interference technique, the CLS-CS is introduced to improve the characteristics of the filter, generating four new transmission zeros (TZs) close to band edge. The positions of all TZs are calculated through input impedance deduction. For demonstration, a BPF prototype centered at 2.1 GHz is designed with measured 3-dB fractional bandwidth of 39% (1.68-2.50 GHz) and stopband rejection levels of over 28.9 dB, which validates the proposed idea.

Original language	English
Pages (from-to)	69-74
Number of pages	6
Journal	Microwave and Optical Technology Letters
Volume	63
Issue number	1
DOIs	https://doi.org/10.1002/mop.32555
Publication status	Published - 2021 Jan

Keywords

bandpass filter
coupled line
stopband rejection
transversal signal-interference technique

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1002/mop.32555

Cite this

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title = "Bandpass filter using coupled-line-stub cascaded structure with high stopband rejection",

abstract = "A compact fifth-order bandpass filter (BPF) with high stopband rejection level is proposed using a coupled-line-stub cascaded structure (CLS-CS). Based on transversal signal-interference technique, the CLS-CS is introduced to improve the characteristics of the filter, generating four new transmission zeros (TZs) close to band edge. The positions of all TZs are calculated through input impedance deduction. For demonstration, a BPF prototype centered at 2.1 GHz is designed with measured 3-dB fractional bandwidth of 39% (1.68-2.50 GHz) and stopband rejection levels of over 28.9 dB, which validates the proposed idea.",

keywords = "bandpass filter, coupled line, stopband rejection, transversal signal-interference technique",

author = "Sen Lu and Xu, {Kai Da} and Yingjiang Guo and Yi Ren and Qiang Chen",

note = "Funding Information: This work was supported in part by the Grant‐in‐Aid for JSPS Research Fellow under Grant JP19F19350 (Dr. Xu is the JSPS International Research Fellow [P19350]), and in part by the NSFC under Grant 61871063. Publisher Copyright: {\textcopyright} 2020 Wiley Periodicals LLC",

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doi = "10.1002/mop.32555",

language = "English",

volume = "63",

pages = "69--74",

journal = "Microwave and Optical Technology Letters",

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AU - Lu, Sen

AU - Xu, Kai Da

AU - Guo, Yingjiang

AU - Ren, Yi

AU - Chen, Qiang

N1 - Funding Information: This work was supported in part by the Grant‐in‐Aid for JSPS Research Fellow under Grant JP19F19350 (Dr. Xu is the JSPS International Research Fellow [P19350]), and in part by the NSFC under Grant 61871063. Publisher Copyright: © 2020 Wiley Periodicals LLC

PY - 2021/1

Y1 - 2021/1

N2 - A compact fifth-order bandpass filter (BPF) with high stopband rejection level is proposed using a coupled-line-stub cascaded structure (CLS-CS). Based on transversal signal-interference technique, the CLS-CS is introduced to improve the characteristics of the filter, generating four new transmission zeros (TZs) close to band edge. The positions of all TZs are calculated through input impedance deduction. For demonstration, a BPF prototype centered at 2.1 GHz is designed with measured 3-dB fractional bandwidth of 39% (1.68-2.50 GHz) and stopband rejection levels of over 28.9 dB, which validates the proposed idea.

AB - A compact fifth-order bandpass filter (BPF) with high stopband rejection level is proposed using a coupled-line-stub cascaded structure (CLS-CS). Based on transversal signal-interference technique, the CLS-CS is introduced to improve the characteristics of the filter, generating four new transmission zeros (TZs) close to band edge. The positions of all TZs are calculated through input impedance deduction. For demonstration, a BPF prototype centered at 2.1 GHz is designed with measured 3-dB fractional bandwidth of 39% (1.68-2.50 GHz) and stopband rejection levels of over 28.9 dB, which validates the proposed idea.

KW - bandpass filter

KW - coupled line

KW - stopband rejection

KW - transversal signal-interference technique

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Bandpass filter using coupled-line-stub cascaded structure with high stopband rejection

Abstract

Keywords

ASJC Scopus subject areas

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