Lowpass Filter with Wide Stopband Based on T-Shaped Resonator Loaded Step-Impedance Hairpin Resonator

Zhong Lunjie; Zuo Qiliang; Xu Jinping

doi:doi:10.11648/j.sd.20190701.20

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Lowpass Filter with Wide Stopband Based on T-Shaped Resonator Loaded Step-Impedance Hairpin Resonator

Zhong Lunjie, Zuo Qiliang, Xu Jinping

Published in Science Discovery (Volume 7, Issue 1)

Received: 19 April 2019 Published: 23 May 2019

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Abstract

A lowpass filter with wide stopband based on stepped impedance hairpin resonator is proposed. Multiple transmission zeros are created in the stopband region by different size T-shaped resonator to achieve wide stopband. A lowpass filter with 3dB cutoff frequency (f_c) at 3.2GHz is designed, simulated and fabricated. Experimental results indicate that stopband can be extended to more than 7f_c with a rejection level of 20dB after loading T-shaped resonator. The insertion loss is lower than 0.4dB and return loss is better than 16dB in the passband. Excluding the feed lines, the size of the filter is less than 0.26λ_g X 0.06λ_g. The modified filter is of good value in engineering application for its small size, sharp cutoff frequency response and wide stopband.

Published in	Science Discovery (Volume 7, Issue 1)
DOI	10.11648/j.sd.20190701.20
Page(s)	45-49
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2019. Published by Science Publishing Group

Keywords

Hairpin Resonator, T-shaped Resonator, Lowpass Filter, Wide Stopband

References

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[2]	Hsieh L H, Chang K. Compact lowpass filter using stepped impedance hairpin resonator [J]. Electronics Letters, 2001, 37 (14): 899.
[3]	Jiang S, Xu J. Compact microstrip lowpass filter with ultra-wide stopband based on dual-plane structure [J]. Electronics Letters, 2017, 53 (9): 607-609.
[4]	傅世强, 张佳琦, 房少军. 一种超宽阻带微带低通滤波器的设计[J]. 微波学报, 2018, 34(5):41-43。
[5]	Hsieh L H, Chang K. Compact elliptic-function low-pass filters using microstrip stepped impedance hairpin resonator [J]. IEEE Transactions on Microwave Theory and Techniques, 2003, 51 (1): 193-199.
[6]	Li Z, Wang G M, Zhang C X, et al. Compact ultra-wide bandpass filter with good out-of-band performance [C] // International Conference on Microwave & Millimeter Wave Technology. IEEE, 2008.
[7]	Li R, Kim D I, Choi C M. Compact Structure With Three Attenuation Poles for Improving Stopband Characteristics [J]. IEEE Microwave and Wireless Components Letters, 2006, 16 (12): 663-665.
[8]	Yang M H, Xu J. Design of compact, broad-stopband lowpass filter using modified stepped impedance hairpin resonators [J]. Electronics Letters, 2008, 44 (20): 1198-1199.
[9]	Wei X B, Wang P, Liu M Q, et al. Compact wide-stopband lowpass filter using stepped impedance hairpin resonator with radial stubs [J]. Electronics Letters, 2011, 47 (15): 862.
[10]	毛睿杰, 唐小宏, 王玲. 宽阻带阶跃阻抗发夹线带通滤波器设计[J]. 微波学报, 2007(1):44-46。
[11]	Makimoto, Mitsuo. Microwave Resonators and Filters for Wireless Communication [M]. Springer, 2010, 4: 88-89.

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APA Style

Zhong Lunjie, Zuo Qiliang, Xu Jinping. (2019). Lowpass Filter with Wide Stopband Based on T-Shaped Resonator Loaded Step-Impedance Hairpin Resonator. Science Discovery, 7(1), 45-49. https://doi.org/10.11648/j.sd.20190701.20

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ACS Style

Zhong Lunjie; Zuo Qiliang; Xu Jinping. Lowpass Filter with Wide Stopband Based on T-Shaped Resonator Loaded Step-Impedance Hairpin Resonator. Sci. Discov. 2019, 7(1), 45-49. doi: 10.11648/j.sd.20190701.20

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AMA Style

Zhong Lunjie, Zuo Qiliang, Xu Jinping. Lowpass Filter with Wide Stopband Based on T-Shaped Resonator Loaded Step-Impedance Hairpin Resonator. Sci Discov. 2019;7(1):45-49. doi: 10.11648/j.sd.20190701.20

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@article{10.11648/j.sd.20190701.20,
  author = {Zhong Lunjie and Zuo Qiliang and Xu Jinping},
  title = {Lowpass Filter with Wide Stopband Based on T-Shaped Resonator Loaded Step-Impedance Hairpin Resonator},
  journal = {Science Discovery},
  volume = {7},
  number = {1},
  pages = {45-49},
  doi = {10.11648/j.sd.20190701.20},
  url = {https://doi.org/10.11648/j.sd.20190701.20},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.sd.20190701.20},
  abstract = {A lowpass filter with wide stopband based on stepped impedance hairpin resonator is proposed. Multiple transmission zeros are created in the stopband region by different size T-shaped resonator to achieve wide stopband. A lowpass filter with 3dB cutoff frequency (fc) at 3.2GHz is designed, simulated and fabricated. Experimental results indicate that stopband can be extended to more than 7fc with a rejection level of 20dB after loading T-shaped resonator. The insertion loss is lower than 0.4dB and return loss is better than 16dB in the passband. Excluding the feed lines, the size of the filter is less than 0.26λg X 0.06λg. The modified filter is of good value in engineering application for its small size, sharp cutoff frequency response and wide stopband.},
 year = {2019}
}

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TY  - JOUR
T1  - Lowpass Filter with Wide Stopband Based on T-Shaped Resonator Loaded Step-Impedance Hairpin Resonator
AU  - Zhong Lunjie
AU  - Zuo Qiliang
AU  - Xu Jinping
Y1  - 2019/05/23
PY  - 2019
N1  - https://doi.org/10.11648/j.sd.20190701.20
DO  - 10.11648/j.sd.20190701.20
T2  - Science Discovery
JF  - Science Discovery
JO  - Science Discovery
SP  - 45
EP  - 49
PB  - Science Publishing Group
SN  - 2331-0650
UR  - https://doi.org/10.11648/j.sd.20190701.20
AB  - A lowpass filter with wide stopband based on stepped impedance hairpin resonator is proposed. Multiple transmission zeros are created in the stopband region by different size T-shaped resonator to achieve wide stopband. A lowpass filter with 3dB cutoff frequency (fc) at 3.2GHz is designed, simulated and fabricated. Experimental results indicate that stopband can be extended to more than 7fc with a rejection level of 20dB after loading T-shaped resonator. The insertion loss is lower than 0.4dB and return loss is better than 16dB in the passband. Excluding the feed lines, the size of the filter is less than 0.26λg X 0.06λg. The modified filter is of good value in engineering application for its small size, sharp cutoff frequency response and wide stopband.
VL  - 7
IS  - 1
ER  -

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Author Information

Zhong Lunjie

State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, China
Zuo Qiliang

State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, China
Xu Jinping

State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, China

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Plain Text BibTeX RIS

APA Style

Zhong Lunjie, Zuo Qiliang, Xu Jinping. (2019). Lowpass Filter with Wide Stopband Based on T-Shaped Resonator Loaded Step-Impedance Hairpin Resonator. Science Discovery, 7(1), 45-49. https://doi.org/10.11648/j.sd.20190701.20

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ACS Style

Zhong Lunjie; Zuo Qiliang; Xu Jinping. Lowpass Filter with Wide Stopband Based on T-Shaped Resonator Loaded Step-Impedance Hairpin Resonator. Sci. Discov. 2019, 7(1), 45-49. doi: 10.11648/j.sd.20190701.20

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AMA Style

Zhong Lunjie, Zuo Qiliang, Xu Jinping. Lowpass Filter with Wide Stopband Based on T-Shaped Resonator Loaded Step-Impedance Hairpin Resonator. Sci Discov. 2019;7(1):45-49. doi: 10.11648/j.sd.20190701.20

Copy | Download

@article{10.11648/j.sd.20190701.20,
  author = {Zhong Lunjie and Zuo Qiliang and Xu Jinping},
  title = {Lowpass Filter with Wide Stopband Based on T-Shaped Resonator Loaded Step-Impedance Hairpin Resonator},
  journal = {Science Discovery},
  volume = {7},
  number = {1},
  pages = {45-49},
  doi = {10.11648/j.sd.20190701.20},
  url = {https://doi.org/10.11648/j.sd.20190701.20},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.sd.20190701.20},
  abstract = {A lowpass filter with wide stopband based on stepped impedance hairpin resonator is proposed. Multiple transmission zeros are created in the stopband region by different size T-shaped resonator to achieve wide stopband. A lowpass filter with 3dB cutoff frequency (fc) at 3.2GHz is designed, simulated and fabricated. Experimental results indicate that stopband can be extended to more than 7fc with a rejection level of 20dB after loading T-shaped resonator. The insertion loss is lower than 0.4dB and return loss is better than 16dB in the passband. Excluding the feed lines, the size of the filter is less than 0.26λg X 0.06λg. The modified filter is of good value in engineering application for its small size, sharp cutoff frequency response and wide stopband.},
 year = {2019}
}

Copy | Download

TY  - JOUR
T1  - Lowpass Filter with Wide Stopband Based on T-Shaped Resonator Loaded Step-Impedance Hairpin Resonator
AU  - Zhong Lunjie
AU  - Zuo Qiliang
AU  - Xu Jinping
Y1  - 2019/05/23
PY  - 2019
N1  - https://doi.org/10.11648/j.sd.20190701.20
DO  - 10.11648/j.sd.20190701.20
T2  - Science Discovery
JF  - Science Discovery
JO  - Science Discovery
SP  - 45
EP  - 49
PB  - Science Publishing Group
SN  - 2331-0650
UR  - https://doi.org/10.11648/j.sd.20190701.20
AB  - A lowpass filter with wide stopband based on stepped impedance hairpin resonator is proposed. Multiple transmission zeros are created in the stopband region by different size T-shaped resonator to achieve wide stopband. A lowpass filter with 3dB cutoff frequency (fc) at 3.2GHz is designed, simulated and fabricated. Experimental results indicate that stopband can be extended to more than 7fc with a rejection level of 20dB after loading T-shaped resonator. The insertion loss is lower than 0.4dB and return loss is better than 16dB in the passband. Excluding the feed lines, the size of the filter is less than 0.26λg X 0.06λg. The modified filter is of good value in engineering application for its small size, sharp cutoff frequency response and wide stopband.
VL  - 7
IS  - 1
ER  -

Copy | Download