• HUDA AL-TAYYAR College of Engineering, University of Mosul, Mosul, Iraq.


band pass filter BPF, compact filter, edge coupled, transmission line theory


A third order band pass filter (BPF) is constructed and analyzed using transmission line theory. An RF bandpass filter has analyzed using the equations from the text microwave and RF design of wireless system. The aim of this research was to evaluate the edge-coupled filter and produce equivalent analytical solutions by applying the approach of transmission line theory. However, compared to other filters, it is smaller because it employs quarter wave resonators rather than half wave resonators. After analyzing a single BPF section, certain estimates were made and the section was used for coupled line sections. The results proof the satisfied operation of this BPF at S and C bands with a wider bandwidth and compact size even when increasing the filter order. The MATLAB program for RF filter is utilized in this paper, based on the coupling matrix concept.


Al-Yasir, Y.I., OjaroudiParchin, N., Abdulkhaleq, A., Hameed, K., Al-Sadoon, M., Abd-Alhameed, R. (2019): Design, simulation and implementation of very compact dual-band microstrip bandpass filter for 4G and 5G applications. – In 2019 16th international conference on synthesis, modeling, analysis and simulation methods and applications to circuit design (SMACD), IEEE 4p.

Al-Yasir, Y., Abd-Alhameed, R.A., Noras, J.M., Abdulkhaleq, A.M., Parchin, N.O. (2018): Design of very compact combline band-pass filter for 5G applications. – IET Conference Publications 4p.

Eroglu, A. (2022): RF/microwave Engineering and Applications in Energy Systems. – John Wiley & Sons 640p.

Guo, Y.J., Xu, K.D., Deng, X., Cheng, X., Chen, Q. (2020): Millimeter-wave on-chip bandpass filter based on spoof surface plasmon polaritons. – IEEE Electron Device Letters 41(8): 1165-1168.

Gustrau, F. (2012): RF and microwave engineering: fundamentals of wireless communications. – John Wiley & Sons 368p.

He, X., Qiu, R.C., Ai, Q., Chu, L., Xu, X., Ling, Z. (2016): Designing for situation awareness of future power grids: An indicator system based on linear eigenvalue statistics of large random matrices. – IEEE Access 4: 3557-3568.

Jaiswal, R.K., Pandit, N., Pathak, N.P. (2018): Spoof surface plasmon polaritons based reconfigurable band-pass filter. – IEEE Photonics Technology Letters 31(3): 218-221.

Li, P., Chu, H., Zhao, D., Chen, R.S. (2017): Compact dual-band balanced SIW bandpass filter with improved common-mode suppression. – IEEE Microwave and Wireless Components Letters 27(4): 347-349.

Mahttei, G., Young, L., Jones, E.M.T. (1980): Microwave filters, Impedance matching networks and coupling Structure. – Norwood, MA, Artech House 558p.

Mezaal, Y.S., Al-Zayed, A.S. (2019): Design of microstrip bandpass filters based on stair-step patch resonator. – International Journal of Electronics 106(3): 477-490.

Pal, B., Mandal, M.K., Dwari, S. (2019): Varactor tuned dual-band bandpass filter with independently tunable band positions. – IEEE Microwave and Wireless Components Letters 29(4): 255-257.

Pozar, D.M. (2012): Microwave engineering. – University of Massachusetts at Amherst, John Wiley & Sons, Inc. 30p.

Psychogiou, D., Gómez-García, R., Peroulis, D. (2017): RF wide-band bandpass filter with dynamic in-band multi-interference suppression capability. – IEEE Transactions on Circuits and Systems II: Express Briefs 65(7): 898-902.

Psychogiou, D., Gómez-García, R. (2017): Reflectionless adaptive RF filters: Bandpass, bandstop, and cascade designs. – IEEE Transactions on Microwave Theory and Techniques 65(11): 4593-4605.

Rahman, M.U., Ko, D.S., Park, J.D. (2018): A compact tri‐band bandpass filter utilizing double mode resonator with 6 transmission zeros. – Microwave and Optical Technology Letters 60(7): 1767-1771.

Scholl, P., Williams, H.J., Bornet, G., Wallner, F., Barredo, D., Henriet, L., Signoles, A., Hainaut, C., Franz, T., Geier, S., Tebben, A. (2022): Microwave Engineering of Programmable X X Z Hamiltonians in Arrays of Rydberg Atoms. – PRX Quantum 3(2): 10p.

Wyndrum, R.W. (1965): Microwave filters, impedance-matching networks, and coupling structures. – Proceedings of the IEEE 53(7): 766-766.

Yang, Y., Zhu, X., Dutkiewicz, E., Xue, Q. (2017): Design of a miniaturized on-chip bandpass filter using edge-coupled resonators for millimeter-wave applications. – IEEE Transactions on Electron Devices 64(9): 3822-3828.

Yoon, K., Kim, K. (2021): Compact size of an interdigital band-pass filter with flexible bandwidth and low insertion-loss using a folded spiral and stepped impedance resonant structure. – Electronics 10(16): 12p.

Zheng, S.Y., Su, Z.L., Pan, Y.M., Qamar, Z., Ho, D. (2018): New dual-/tri-band bandpass filters and diplexer with large frequency ratio. – IEEE Transactions on Microwave Theory and Techniques 66(6): 2978-2992.




How to Cite

AL-TAYYAR, H. (2024). THIRD ORDER EDGE-COUPLED BPF ANALYSIS FOR S AND C BANDS USING TRANSMISSION LINE THEORY. Quantum Journal of Engineering, Science and Technology, 5(1), 45–55. Retrieved from