Ultra-Wideband Microstrip Bandpass Filter and Its Equivalent Circuit


Shita Fitria Nurjihan(1*), Yenniwarti Rafsyam(2)

(1) Politeknik Negeri Jakarta
(2) Politeknik Negeri Jakarta
(*) Corresponding Author


Microstrip filters can be designed with various methods to obtain good performances, such as defected ground structure, open-ended slot, planar edge coupled, and split ring resonator with groundplane windowing. In this paper, the design of an ultra-wideband microstrip bandpass filter used the defected ground structure (DGS) method by adding a circular slot to the groundplane. The addition of the circular slot was carried out to improve the value of S parameter (return loss and insertion loss) from the initial filter design without a circular slot. In the simulation process, optimization was carried out by changing the value of filter component parameters such as patch length and thickness and circular slot width. The simulation results showed that the microstrip bandpass filter could pass frequencies in the range of 1.4 GHz to 5.7 GHz with the bandwidth response of 4.3 GHz. In addition, filter analysis could also be done with an equivalent circuit represented by lumped element components in the form of capacitors and inductors connected in series or parallel. The simulation results of the equivalent circuit had a wider bandwidth, which was able to pass frequencies in the range of 1.2 GHz to 6.1 GHz with a bandwidth response of 4.9 GHz.


Defected Ground Structure;Bandpass Filter;Microstrip;Equivalent Circuit

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A. Ghosh and P. Mondal, “Bandpass Filter Using a Combination of DGS’s and Open Ended Slot,” 2018 2nd International Conference on Trends in Electronics and Informatics (ICOEI), May 2018, pp. 392-396.

S. Lavanya, M.U. Maheshwari, E. Soundarya, A.G. Porkodi, K. Sophiya, and S. Kanthamani, “Planar Ultra Wideband Bandpass Filter Using defected ground structure,” 2015 International Conference on Innovations in Information, Embedded and Communication Systems (ICIIECS), Mar. 2015, pp. 1-3.

S.F. Nurjihan and A. Munir, “Effect of DGS Incorporation for Bandwidth Enhancement of UWB Microstrip BPF,” Proceedings of 3rd International Conference on Wireless and Telematics (ICWT), Jul. 2017, pp. 39-42.

S.F. Nurjihan and A. Munir, “Rancang Bangun Filter Bandpass Mikrostrip Pita Sangat Lebar Berbasis Defected Ground Structure,” Jurnal Nasional Teknik Elektro dan Teknologi Informasi, Vol. 9, No. 1, pp. 104-109, Feb. 2020.

S. Tantiviwat, M.S. Razalli, and S.Z. Ibrahim, “Miniature Microstrip Bandpass Filters Based on Quadruple-Mode Resonators with Less Via,” 2017 IEEE MTT-S International Conference on Microwaves for Intelligent Mobility (ICMIM), 2017, pp. 1-4.

D.S. Salgare and S.R. Mahardik, “A review of defected ground structure for microstrip antennas,” International Research Journal of Engineering and Technology (IRJET), Vol. 2, No. 6, pp. 150-154, Sep. 2015.

X. Zhieng and X. Wang, “Design of Slot Coupled Microstrip Bandpass Filter Based on Defected Ground Structure (DGS),” 2019 18th International Conference on Optical Communications and Networks (ICOCN), Aug. 2019, pp. 1-3.

A. Munir, B.D. Wulandari, W. Aditomo, and Y. Prasetio, “DGS-based UWB Microstrip BPF and Its Equivalent Circuit,” 2017 9th International Conference on Computational Intelligence and Communication Networks (CICN), Sep. 2017, pp. 11-15.

E.R Afthar, M.R. Hidayat, and A. Munir, “Analysis of equivalent circuit for bandpass filter based on SRR with groundplane windowing," Proceedings of Asia-Pacific Conference on Communications (APCC), 2016, pp. 361-364.

A. Munir, E.R. Afthar, and R. Safitri, “Study on Equivalent Circuit of Wideband BPF Using Groundplane Windowed SRR and Its Realization," Proceedings of 7th International Annual Engineering Seminar (InAES), 2017, pp. 1-4.

Y.D. Chen and C.H. Liu, “Exploiting Hi-Lo Inter-Digital DGS for High-Order Microstrip Bandpass Filter,” Asia-Pacific Conference on Antennas and Propagation (APCAP), 2016, pp. 83-84.

Edwar and A. Munir, “Equivalent Circuit Analysis of Square-Loop-Resonator BPF with Cross-Shaped I/O Coupling for X-Band Frequency Application,” International Conference on Control, Electronics, Renewable Energy and Communications (ICCEREC), 2017, pp. 66-69.

D.K. Misra, Radio-Frequency and Microwave Communication Circuit: Analysis and Design, 2nd ed., Hoboken, USA: John Wiley & Sons, Inc., 2004.

K.C. Gupta, R. Garg, I. Bahl, and P. Bhartia, Microstrip Lines and Slotlines, 2nd ed., Norwood, USA: Artech House, 1996.

C. Alexander and M. Sadiku, Fundamentals of Electric Circuit, 4th ed., New York, USA: McGraw-Hill, 2009.

DOI: https://doi.org/10.22146/ijitee.65695

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