Stepped-Impedance Hairpin Resonators with Asymmetric Capacitively Loaded Coupled Lines for Improved Stopband Characteristics

Apirada NAMSANG; Thammarat MAJAENG; Jaruek JANTREE; Sarawuth CHAIMOOL; Prayoot AKKARAEKTHALIN

doi:10.1093/ietele/e90-c.12.2185

Stepped-Impedance Hairpin Resonators with Asymmetric Capacitively Loaded Coupled Lines for Improved Stopband Characteristics

Apirada NAMSANG, Thammarat MAJAENG, Jaruek JANTREE, Sarawuth CHAIMOOL, Prayoot AKKARAEKTHALIN

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New microstrip bandpass filters with extended stopband bandwidths are proposed by using new asymmetric stepped-impedance hairpin resonators (ASIHRs). The size of the proposed resonators has been reduced around 16%, comparing with the conventional stepped-impedance hairpin resonators (SIHRs) structure. The first bandpass filter is a combination of differ resonators with the same fundamental frequency but differ in harmonic frequencies, resulting in improved suppression spurious responses in stopbands. Furthermore, another bandpass filter uses the ASIHRs periodically loaded on a microstrip line to improve stopband characteristics. The proposed filters not only have compact size of resonators, but also provide improved upper stopband characteristics. The proposed filters provide 20 dB rejection levels in the stopband up to 6f₀. The measured filters responses agree very well with the simulated expectations.

Publication: IEICE TRANSACTIONS on Electronics Vol.E90-C No.12 pp.2185-2191

Publication Date: 2007/12/01

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Online ISSN: 1745-1353

DOI: 10.1093/ietele/e90-c.12.2185

Type of Manuscript: Special Section PAPER (Special Section on Recent Technologies for Microwave and Millimeter-wave Passive Devices)

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Apirada NAMSANG, Thammarat MAJAENG, Jaruek JANTREE, Sarawuth CHAIMOOL, Prayoot AKKARAEKTHALIN, "Stepped-Impedance Hairpin Resonators with Asymmetric Capacitively Loaded Coupled Lines for Improved Stopband Characteristics" in IEICE TRANSACTIONS on Electronics, vol. E90-C, no. 12, pp. 2185-2191, December 2007, doi: 10.1093/ietele/e90-c.12.2185.
Abstract: New microstrip bandpass filters with extended stopband bandwidths are proposed by using new asymmetric stepped-impedance hairpin resonators (ASIHRs). The size of the proposed resonators has been reduced around 16%, comparing with the conventional stepped-impedance hairpin resonators (SIHRs) structure. The first bandpass filter is a combination of differ resonators with the same fundamental frequency but differ in harmonic frequencies, resulting in improved suppression spurious responses in stopbands. Furthermore, another bandpass filter uses the ASIHRs periodically loaded on a microstrip line to improve stopband characteristics. The proposed filters not only have compact size of resonators, but also provide improved upper stopband characteristics. The proposed filters provide 20 dB rejection levels in the stopband up to 6f₀. The measured filters responses agree very well with the simulated expectations.
URL: https://globals.ieice.org/en_transactions/electronics/10.1093/ietele/e90-c.12.2185/_p

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@ARTICLE{e90-c_12_2185,
author={Apirada NAMSANG, Thammarat MAJAENG, Jaruek JANTREE, Sarawuth CHAIMOOL, Prayoot AKKARAEKTHALIN, },
journal={IEICE TRANSACTIONS on Electronics},
title={Stepped-Impedance Hairpin Resonators with Asymmetric Capacitively Loaded Coupled Lines for Improved Stopband Characteristics},
year={2007},
volume={E90-C},
number={12},
pages={2185-2191},
abstract={New microstrip bandpass filters with extended stopband bandwidths are proposed by using new asymmetric stepped-impedance hairpin resonators (ASIHRs). The size of the proposed resonators has been reduced around 16%, comparing with the conventional stepped-impedance hairpin resonators (SIHRs) structure. The first bandpass filter is a combination of differ resonators with the same fundamental frequency but differ in harmonic frequencies, resulting in improved suppression spurious responses in stopbands. Furthermore, another bandpass filter uses the ASIHRs periodically loaded on a microstrip line to improve stopband characteristics. The proposed filters not only have compact size of resonators, but also provide improved upper stopband characteristics. The proposed filters provide 20 dB rejection levels in the stopband up to 6f₀. The measured filters responses agree very well with the simulated expectations.},
keywords={},
doi={10.1093/ietele/e90-c.12.2185},
ISSN={1745-1353},
month={December},}

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TY - JOUR
TI - Stepped-Impedance Hairpin Resonators with Asymmetric Capacitively Loaded Coupled Lines for Improved Stopband Characteristics
T2 - IEICE TRANSACTIONS on Electronics
SP - 2185
EP - 2191
AU - Apirada NAMSANG
AU - Thammarat MAJAENG
AU - Jaruek JANTREE
AU - Sarawuth CHAIMOOL
AU - Prayoot AKKARAEKTHALIN
PY - 2007
DO - 10.1093/ietele/e90-c.12.2185
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E90-C
IS - 12
JA - IEICE TRANSACTIONS on Electronics
Y1 - December 2007
AB - New microstrip bandpass filters with extended stopband bandwidths are proposed by using new asymmetric stepped-impedance hairpin resonators (ASIHRs). The size of the proposed resonators has been reduced around 16%, comparing with the conventional stepped-impedance hairpin resonators (SIHRs) structure. The first bandpass filter is a combination of differ resonators with the same fundamental frequency but differ in harmonic frequencies, resulting in improved suppression spurious responses in stopbands. Furthermore, another bandpass filter uses the ASIHRs periodically loaded on a microstrip line to improve stopband characteristics. The proposed filters not only have compact size of resonators, but also provide improved upper stopband characteristics. The proposed filters provide 20 dB rejection levels in the stopband up to 6f₀. The measured filters responses agree very well with the simulated expectations.
ER -