Miniaturized tri-notched wideband bandpass filter with ultrawide upper stopband suppression

Abstract Stepped impedance resonator (SIR) and its derivative resonators are widely used in the design of microwave filters. However, many spurious modes will be introduced into the stopband, resulting in lower upper stopband suppression and performance degradation. Based on the principle of slit li...

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Autores principales:	Chen-Hao Wang, Xiao-Min Shi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/72a6bb8370004336ad25448a20514f06
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spelling	oai:doaj.org-article:72a6bb8370004336ad25448a20514f062021-12-02T17:45:03ZMiniaturized tri-notched wideband bandpass filter with ultrawide upper stopband suppression10.1038/s41598-021-92394-72045-2322https://doaj.org/article/72a6bb8370004336ad25448a20514f062021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-92394-7https://doaj.org/toc/2045-2322Abstract Stepped impedance resonator (SIR) and its derivative resonators are widely used in the design of microwave filters. However, many spurious modes will be introduced into the stopband, resulting in lower upper stopband suppression and performance degradation. Based on the principle of slit line, a method to enhance the upper stopband suppression is proposed and verified by a miniaturized tri-notched wideband bandpass filter based on stub loaded ring resonator (SLRR) and shorted-stub loaded SIR (SSLSIR). The wideband is formed by coupling SLRR and interdigital lines, which has a rectangular DGS on the back of the substrate. Three notched bands with controllable positions in the passband can be produced by inserting two different SSLSIRs inside and outside the SLRR. Four slit lines are loaded on the low impedance stub of SSLSIR to adjust the high-order modes close to the transmission zeros (TZs). The operating frequency of the filter is 2.2–7.6 GHz, and the three notched bands are located at 2.97 GHz, 5.75 GHz and 6.46 GHz, respectively. The measurement results show that the − 20 dB enhanced upper stopband of the filter can reach 32 GHz, which proves that the filter has the characteristic of ultrawide upper stopband suppression while keeping the miniaturization.Chen-Hao WangXiao-Min ShiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Chen-Hao Wang Xiao-Min Shi Miniaturized tri-notched wideband bandpass filter with ultrawide upper stopband suppression
description	Abstract Stepped impedance resonator (SIR) and its derivative resonators are widely used in the design of microwave filters. However, many spurious modes will be introduced into the stopband, resulting in lower upper stopband suppression and performance degradation. Based on the principle of slit line, a method to enhance the upper stopband suppression is proposed and verified by a miniaturized tri-notched wideband bandpass filter based on stub loaded ring resonator (SLRR) and shorted-stub loaded SIR (SSLSIR). The wideband is formed by coupling SLRR and interdigital lines, which has a rectangular DGS on the back of the substrate. Three notched bands with controllable positions in the passband can be produced by inserting two different SSLSIRs inside and outside the SLRR. Four slit lines are loaded on the low impedance stub of SSLSIR to adjust the high-order modes close to the transmission zeros (TZs). The operating frequency of the filter is 2.2–7.6 GHz, and the three notched bands are located at 2.97 GHz, 5.75 GHz and 6.46 GHz, respectively. The measurement results show that the − 20 dB enhanced upper stopband of the filter can reach 32 GHz, which proves that the filter has the characteristic of ultrawide upper stopband suppression while keeping the miniaturization.
format	article
author	Chen-Hao Wang Xiao-Min Shi
author_facet	Chen-Hao Wang Xiao-Min Shi
author_sort	Chen-Hao Wang
title	Miniaturized tri-notched wideband bandpass filter with ultrawide upper stopband suppression
title_short	Miniaturized tri-notched wideband bandpass filter with ultrawide upper stopband suppression
title_full	Miniaturized tri-notched wideband bandpass filter with ultrawide upper stopband suppression
title_fullStr	Miniaturized tri-notched wideband bandpass filter with ultrawide upper stopband suppression
title_full_unstemmed	Miniaturized tri-notched wideband bandpass filter with ultrawide upper stopband suppression
title_sort	miniaturized tri-notched wideband bandpass filter with ultrawide upper stopband suppression
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/72a6bb8370004336ad25448a20514f06
work_keys_str_mv	AT chenhaowang miniaturizedtrinotchedwidebandbandpassfilterwithultrawideupperstopbandsuppression AT xiaominshi miniaturizedtrinotchedwidebandbandpassfilterwithultrawideupperstopbandsuppression
_version_	1718379594229219328

Miniaturized tri-notched wideband bandpass filter with ultrawide upper stopband suppression

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