Abstract
In this paper, a bandpass filter (BPF) has been designed using bent and coupled-line structure. The design process of the filter to achieve a BPF with good characteristics is completely explained. Therefore the LC equivalent circuit of The BPF is presented as the analytical description. The proposed filter can pass frequencies between 2.2 and 3.6 GHz with an insertion loss <0.4 dB, which is suitable for wireless applications. The fractional bandwidths (FBW) of the filter is about 48%. Some characteristics such as small size, low insertion loss, high return loss wide upper stopband bandwidth, and good suppression level in stopband are among the advantages of this study to be mentioned. Finally, the presented filter was fabricated, and the measured results have a proper agreement with the simulation results.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
References
[1] A. Ghaderi, A. Golestanifar, and F. Shama, “Design of a compact microstrip tunable dual-band bandpass filter,” AEU Int. J. Electron. Commun., vol. 82, pp. 391–396, 2017, https://doi.org/10.1016/j.aeue.2017.10.002.Search in Google Scholar
[2] W. Ieu, D. Zhang, and D. Zhou, “High-selectivity dual-mode dual-band microstrip bandpass filter with multi-transmission zeros,” Electron. Lett., vol. 53, no. 7, pp. 482–484, 2017, https://doi.org/10.1049/el.2016.4103.Search in Google Scholar
[3] Y. Chang, W. Feng, and W. Che, “Dual-band bandpass filters with high isolation using coupled lines,” Int. J. Electron., vol. 103, no. 3, pp. 372–383, 2016, https://doi.org/10.1080/00207217.2015.1036373.Search in Google Scholar
[4] B. Denis, K. Song, and F. Zhang, “Compact dual-band bandpass filter using open stub-loaded stepped impedance resonator with cross-slots,” Int. J. Microwave Wirel. Technol., vol. 9, no. 2, p. 269, 2017, https://doi.org/10.1017/s1759078715001786.Search in Google Scholar
[5] M.-C. Tang, S. Ting, C. Shiyong, X. Han, and Z. Xiaoping, “A compact triple-mode filter with Y-type stepped-impedance stub (Y-SIS) for PCS and WiMAX applications,” Wireless Pers. Commun., vol. 94, no. 3, pp. 1331–1339, 2017. https://doi.org/10.1007/s11277-016-3684-z.Search in Google Scholar
[6] J. Xu, “Compact dual-band bandpass filter using stubs loaded ring resonator,” Frequenz, vol. 70, nos 1–2, pp. 17–22, 2016, https://doi.org/10.1515/freq-2015-0109.Search in Google Scholar
[7] K. Annaram and V. Shenbagadevi, “Implementation of harmonics-free narrow-band microstrip bandpass filter using complementary split ring resonator,” Int. J. Electron. Lett., vol. 4, no. 2, pp. 188–196, 2016, https://doi.org/10.1080/00207217.2014.984638.Search in Google Scholar
[8] P. Rezaee and M. Höft, “Design and fabrication of a novel compact bandpass filter to improve spurious-free band,” Frequenz, vol. 71, nos 3–4, pp. 121–128, 2017, https://doi.org/10.1515/freq-2016-0210.Search in Google Scholar
[9] P. Li, C. Hui, Z. Dan, and S. C. Ru, “Compact dual-band balanced SIW bandpass filter with improved common-mode suppression,” IEEE Microw. Wireless Compon. Lett., vol. 27, no. 4, pp. 347–349, 2017. https://doi.org/10.1109/lmwc.2017.2678428.Search in Google Scholar
[10] C. Du, K. Ma, and S. Mou, “A miniature SISL dual-band bandpass filter using a controllable multimode resonator,” IEEE Microw. Wireless Compon. Lett., vol. 27, no. 6, pp. 557–559, 2017, https://doi.org/10.1109/lmwc.2017.2701341.Search in Google Scholar
[11] F. Cheng, L. Xuan-Tan, L. Ping, and H. Kama, “A microstrip bandpass filter with 2 independently tunable transmission zeros,” Microw. Opt. Technol. Lett., vol. 62, no. 5, pp. 1951–1956, 2020. https://doi.org/10.1002/mop.32275.Search in Google Scholar
[12] A. Rezaei and S. I. Yahya, “High-performance ultra-compact dual-band bandpass filter for global System for mobile communication-850/global system for mobile communication-1900 applications,” ARO Sci. J. Koya Univ., vol. 7, no. 2, pp. 34–37, 2019, https://doi.org/10.14500/aro.10574.Search in Google Scholar
[13] M. Potrebić, D. Tošić, and A. Plazinić, “Reconfigurable multilayer dual-mode bandpass filter based on memristive switch,” AEU Int. J. Electron. Commun., vol. 97, pp. 290–298, 2018.10.1016/j.aeue.2018.10.032Search in Google Scholar
[14] Y.‐T. Zheng, L. Lin, and Y. Sun, “Wideband and spurious‐suppressed differential bandpass filter based on strip‐loaded slot‐line structure,” Int. J. RF Microw. Comput. Aided Eng., vol. 30, no. 4, p. e22120, 2020, https://doi.org/10.1002/mmce.22120.Search in Google Scholar
[15] H.-W. Xie, Z. Kang, Z. Chun-Xia, and W. Wen, “Analysis of four‐stage stepped‐impedance resonators and their application to quad‐band microstrip bandpass filter,” Int. J. RF Microw. Computer-Aided Eng., vol. 30, no. 4, p. e22116, 2020. https://doi.org/10.1002/mmce.22116.Search in Google Scholar
[16] Q. Liu, Z. Dong-Fang, Z. Dei-Wei, L. Da-Long, and Z. Yi, “Dual-mode microstrip patch bandpass filters with generalized frequency responses,” IEEE Access, vol. 7, pp. 163537–163546, 2019. https://doi.org/10.1109/access.2019.2952403.Search in Google Scholar
[17] D. Sarkar and T. Moyra, “A compact and high selective microstrip dual-band bandpass filter,” in Progress in Advanced Computing and Intelligent Engineering, Singapore, Springer, 2019, pp. 475–481.10.1007/978-981-13-1708-8_43Search in Google Scholar
[18] J. S. Hong and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, New York, NY, John Willey & Sons, 2001, pp. 84–86.10.1002/0471221619Search in Google Scholar
[19] C.-F. Chen, C. Sheng-Fa, T. Bo-Hao, and W. Jun-Hong, “Compact dual-band stepped-impedance resonator filter with separate coupling paths,” Electron. Lett., vol. 50, no. 21, pp. 1551–1552, 2014. https://doi.org/10.1049/el.2014.2982.Search in Google Scholar
[20] S. Lin, W. Jianpeng, Z. Gang, and H. Jiasheng, “Design of microstrip tri-mode balun bandpass filter with high selectivity,” Electron. Lett., vol. 51, no. 13, pp. 998–999, 2015. https://doi.org/10.1049/el.2015.1047.Search in Google Scholar
[21] J. Li, H. Yongjun, W. Guangjun, X. Xiaolin, and S. Jiaming, “Compact and high-selectivity microstrip bandpass filter using two-stage twist-modified asymmetric split-ring resonators,” Electron. Lett., vol. 51, no. 8, pp. 635–637, 2015. https://doi.org/10.1049/el.2014.3988.Search in Google Scholar
[22] B. A. Belyaev, A. M. Serzhantov, A. A. Leksikov, Y. F. Bal’va, and A. A. Leksikov, “Novel high-quality compact microstrip resonator and its application to bandpass filter,” IEEE Microw. Wireless Compon. Lett., vol. 25, no. 9, pp. 579–581, 2015. https://doi.org/10.1109/lmwc.2015.2451363.Search in Google Scholar
[23] C. Cai, W. Jianpeng, Z. Lei, and W. Wen, “A new approach to design microstrip wideband balun bandpass filter,” IEEE Microw. Wireless Compon. Lett., vol. 26, no. 2, pp. 116–118, 2016. https://doi.org/10.1109/lmwc.2016.2516760.Search in Google Scholar
[24] F. Huang, J. Wang, and L. Zhu, “A new approach to design a microstrip dual-mode balun bandpass filter,” IEEE Microw. Wireless Compon. Lett., vol. 26, no. 4, pp. 252–254, 2016, https://doi.org/10.1109/lmwc.2016.2538726.Search in Google Scholar
[25] F. Huang, W. Jianpeng, L. Jialin, and W. Wen, “Compact microstrip wideband bandpass filter with high selectivity,” Electron. Lett., vol. 52, no. 8, pp. 626–628, 2016. https://doi.org/10.1049/el.2015.4539.Search in Google Scholar
[26] H. Guo, N. Jia, and J. Hong, “Varactor-tuned dual-mode bandpass filter with nonuniform Q distribution,” IEEE Microw. Wireless Compon. Lett., vol. 28, no. 11, pp. 1002–1004, 2018, https://doi.org/10.1109/lmwc.2018.2870934.Search in Google Scholar
© 2021 Walter de Gruyter GmbH, Berlin/Boston
