Skip to content
Licensed Unlicensed Requires Authentication Published by De Gruyter October 25, 2021

Ultra wideband bandpass filters with specified relative bandwidth

  • Dusan Nesic EMAIL logo , Tomislav Milosevic and Branko Kolundzija
From the journal Frequenz


Algorithm for the realization of the broad range of values of wide relative bandwidth (RBW) bandpass filter is introduced. Algorithm is based on periodic ideal cells each with short-ended stub. Theory is developed for a symmetrical cell with proportional transmission lines, nonuniform or uniform, in term of characteristic impedance. The theory is applied for the uniform transmission lines. Simple equation of the ratio between characteristic impendence of the short-ended stub and the characteristic impendences of the main lines is given for the broad range of RBW. Realizable filters are for the very wide RBW up to over 1.5 (150%). Technology is chosen in microstrip with vias for the short ends. It is without coupling, without defected ground structure (DGS) and only with a single layer. The procedure is tested on the fabricated filters for very wide RBW of 1.5 (150%). Agreement between measurements and simulations is excellent.

Corresponding author: Dusan Nesic, Centre of Microelectronic Technologies, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoseva 12, Belgrade, Serbia, E-mail:

Funding source: Ministry of Education, Science and Technological Development of the Republic of Serbia

Award Identifier / Grant number: 451-03-68/2020-14/200026

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This work was financially supported by Ministry of Education, Science and Technological Development of the Republic of Serbia (Grant No. 451-03-68/2020-14/200026).

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.


[1] Z.-C. Hao and J.-S. Hong, “Ultrawideband filter technologies,” IEEE Microw. Mag., vol. 11, no. 4, pp. 56–68, 2010, in Google Scholar

[2] R. Zhang and D. Peroulis, “Planar multifrequency wideband bandpass filters with constant and frequency mappings,” IEEE Trans. Microw. Theor. Tech., vol. 66, no. 2, pp. 935–942, 2018, in Google Scholar

[3] R. Zhang, S. Luo, and L. Zhu, “A new synthesis and design method for wideband bandpass filters with generalized unit elements,” IEEE Trans. Microw. Theor. Tech., vol. 65, no. 3, pp. 815–823, 2017, in Google Scholar

[4] L.-T. Wang, Y. Xiong, and M. He, Review on UWB Bandpass Filters, UWB Technology – Circuits and Systems, London, Mohamed Kheir, IntechOpen, 2019. Available at: in Google Scholar

[5] M. S. Razalli, A. Ismail, M. A. Mahd, and M. N. Hamidon, “Compact configuration ultra-wideband microwave filter using quarter-wave length short-circuited stub,” in Proceedings of Asia-Pacific Microwave Conference 2007, Bangkok, Thailand, 2007.10.1109/APMC.2007.4554811Search in Google Scholar

[6] J.-S. Hong and H. Shaman, “An optimum ultra-wideband microstrip filter,” Microw. Opt. Technol. Lett., vol. 47, no. 3, pp. 230–233, 2005, in Google Scholar

[7] W.-T. Wong, Y.-S. Lin, C.-H. Wang, and C. H. Chen, “Highly selective microstrip bandpass filters for ultra-wideband (UWB) applications,” in Proceedings of Asia-Pacific Microwave Conference 2005, Suzhou, China, 2005.Search in Google Scholar

[8] M. S. Razalli, A. Ismail, M. A. Mahdi, and M. N. Hamidon, “Ultra-wide band microwave filter utilizing quarter-wavelength short-circuited stubs,” Microw. Opt. Technol. Lett., vol. 50, no. 11, pp. 2981–2983, 2008, in Google Scholar

[9] M. S. Razalli, A. Ismail, M. A. Mahdi, and M. N. Hamidon, “Compact ultra-wide band microwave filter utilizing quarter-wave length short circuited stubs with reduced number of vias,” Microw. Opt. Technol. Lett., vol. 51, no. 9, pp. 2116–2119, 2009, in Google Scholar

[10] J.-S. Hong, Microstrip Filters for RF/Microwave Applications, Hoboken, New Jersey, John Wiley and Sons, 2011.10.1002/9780470937297Search in Google Scholar

[11] D. A. Nesic, B. M. Kolundzija, D. V. Tosic, and D. S. Jeremic, “Low-pass filter with deep and wide stop band and controllable rejection bandwidth,” Int. J. Microw Wirel. Technol., vol. 7, no. 2, pp. 141–149, 2015, in Google Scholar

[12] D. M. Pozar, Microwave Engineering, New York, John Wiley and Sons, 1998.Search in Google Scholar

[13] Program Package WIPL-D Pro v15, Belgrade, WIPL-D d.o.o., 2019. Available at: in Google Scholar

Received: 2021-02-03
Accepted: 2021-10-08
Published Online: 2021-10-25
Published in Print: 2022-01-27

© 2022 Walter de Gruyter GmbH, Berlin/Boston

Downloaded on 2.10.2023 from
Scroll to top button