Yaqeen S. Mezaal,Shahad K. Khaleel,Aqeel A. Al-Hillal,Adham R. Azeez,,Mohammed S. Hemza,Kadhum Al-Majdi,



Microstrip,Bandpass Filter,Diplexer,Triplexer,


In today's world, communication is essential for various aspects of life. From military operations and medical systems to community networks, communication plays a crucial role in ensuring the smooth functioning of these applications. With the advancement of technology, communication has become more efficient and has significantly reduced the barriers of distance, bringing people and nations closer together. One of the key components of modern communication systems is microstrip devices. These devices are used in a wide range of applications, including filters, diplexers, and triplexers. Filters are used to selectively allow certain frequencies to pass through while blocking others, making them essential for signal processing and interference reduction in communication systems. Diplexers and triplexers are used to combine or separate multiple signals, allowing for more efficient use of the available frequency spectrum. This article aims to provide an overview of the state-of-the-art microstrip devices used in communication systems. It will review previous studies and advancements in the field, providing insights into the latest developments and technologies. By understanding the current state of research and development in microstrip devices, engineers and researchers can gain valuable knowledge to improve the performance and efficiency of communication systems. Furthermore, the article will explore the potential applications of microstrip devices in various communication systems, such as satellite communications, wireless networks, and radar systems. Understanding the capabilities and limitations of these devices will be crucial for optimizing their performance in different scenarios. Overall, this article will serve as a comprehensive resource for anyone interested in the role of microstrip devices in communication systems. Delving into the scope of filters, diplexers, and triplexers, will provide valuable insights into the advancements and potential future developments in this important area of technology.


I. A. Al-ghoul and T. F. Skaik, “Design of UMTS/LTE Diplexer and DCS/UMTS/LTE Triplexer for Mobile Communication Systems,” Islamic University of Gaza, 2013.
II. A. B. Yousif, “Design of Microstrip Diplexer Filters for Wireless Applications,” University of Technology, 2020.
III. A. E. Ammar, N. M. Mahmoud, M. A. Attia, and A. H. Hussein, “Efficient diplexer with high selectivity and low insertion loss based on SOLR and DGS for WiMAX,” Prog. Electromagn. Res. C, vol. 116, pp. 171–180, 2021, doi: 10.2528/PIERC21090104.
IV. A. El-Tokhy, R. Wu, and Y. Wang, “Microstrip triplexer using a common triple-mode resonator,” Microw. Opt. Technol. Lett., vol. 60, no. 7, pp. 1815–1820, 2018, doi: 10.1002/mop.31244.
V. A. Kumar and D. K. Upadhyay, “A compact planar diplexer based on via-free CRLH TL for WiMAX and WLAN applications,” Int. J. Microw. Wirel. Technol., vol. 11, no. 2, pp. 130–138, 2019, doi: 10.1017/S1759078718001496.
VI. A. Rezaei and L. Noori, “Miniaturized microstrip diplexer with high performance using a novel structure for wireless L-band applications,” Wirel. Networks, vol. 26, no. 3, pp. 1795–1802, 2020, doi: 10.1007/s11276-018-1870-5.
VII. A. Rezaei and L. Noori, “Novel low-loss microstrip triplexer using coupled lines and step impedance cells for 4G and WiMAX applications,” Turkish J. Electr. Eng. Comput. Sci., vol. 26, no. 4, pp. 1871–1880, 2018, doi: 10.3906/elk-1708-48.
VIII. A. Rezaei, S. I. Yahya, L. Nouri, and M. H. Jamaluddin, “Design of a low-loss microstrip diplexer with a compact size based on coupled meandrous open-loop resonators,” Analog Integr. Circuits Signal Process., vol. 102, no. 3, pp. 579–584, 2020, doi: 10.1007/s10470-020-01625-w.
IX. A. Rezaei, S. I. Yahya, S. Moradi, and M. H. Jamaluddin, “A compact microstrip triplexer with a novel structure using patch and spiral cells for wireless communication applications,” Prog. Electromagn. Res. Lett., vol. 86, pp. 73–81, 2019, doi: 10.2528/pierl19060104.
X. C. Jayanth, P. Peter, and B. Santhosh, “Optical Triplexer and Diplexer Filter Using Two-Dimensional Photonic Crystal,” Journal of Optics (2023): 1-8.‏

XI. C. Sangdao, “Simulation of Triplexer Design for Improving Insertion Loss and Isolation,” in 17th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON 2020, 2020, pp. 603–606, doi: 10.1109/ECTI-CON49241.2020.9158285.
XII. C. W. Tang and M. G. Chen, “Packaged microstrip triplexer with star-junction topology,” Electronics Letters, vol. 48, no. 12, pp. 699-701, 2012.
XIII. D. A. Letavin, “Microstrip diplexer implemented on high-pass and low-pass filters,” in International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices, EDM, 2018, vol. 2018-July, pp. 199–202, doi: 10.1109/EDM.2018.8435001.
XIV. D. K. Choudhary and R. K. Chaudhary, “Compact Lowpass and Dual-Band Bandpass Filter with Controllable Transmission Zero/Center Frequencies/Passband Bandwidth,” IEEE Trans. Circuits Syst. II Express Briefs, vol. 67, no. 6, pp. 1044–1048, 2020, doi: 10.1109/TCSII.2019.2931446.
XV. D. Sen, E. Dillibabu, and M. Ramesh, “Design of compact inline triplexer for multi band receiver,” 2018, doi: 10.1109/IMaRC.2018.8877199.
XVI. F. Fouladi and A. Rezaei, “A six-channel microstrip diplexer for multi-service wireless communication systems,” Eng. Rev., vol. 41, no. 3, 2021, doi: 10.30765/ER.1556.
XVII. H. A. Hussein, Y. S. Mezaal, and B. M. Alameri, “Miniaturized microstrip diplexer based on fr4 substrate for wireless communications,” Elektron. ir Elektrotechnika, vol. 27, no. 5, pp. 34–40, 2021, doi: 10.5755/j02.eie.28942.
XVIII. H. Tizyi, F. Riouch, A. Tribak, A. Najid, and A. Mediavilla, “Microstrip diplexer design based on two square open loop bandpass filters for RFID applications,” Int. J. Microw. Wirel. Technol., vol. 10, no. 4, pp. 412–421, 2018, doi: 10.1017/S1759078718000314.
XIX. H. X. Xu, G. M. Wang, C. X. Zhang, and J. G. Liang, “Novel design of compact microstrip diplexer based on fractal-shaped composite right/left handed transmission line,” Journal of Infrared and Millimeter Waves, vol. 30, no. 5, pp. 390-396, 2011.
XX. H.-X. Xu, G.-M. Wang, and H.-P. An, “Hilbert fractal curves form compact diplexer,” Microw. & RF, vol. 49, no. 8, pp. 92-95, 2010.
XXI. J. H. Song, K. S. Lee, and Y. Oh, “Triple wavelength demultiplexers for low-cost optical triplexer transceivers,” Journal of Lightwave Technology, vol. 25, no. 1, pp. 350-358, 2007.
XXII. J. Konpang and N. Wattikornsirikul, “An analysis of high selectivity and harmonic suppression based on stepped-impedance resonator structure for dual-mode diplexer,” Prog. Electromagn. Res. C, vol. 112, pp. 45–54, 2021, doi: 10.2528/PIERC21032102.
XXIII. J. Liu et al., “New design of a compact 6-pole reconfigurable narrowband triplexer based on common net-type resonator,” 2018, doi: 10.1109/ASEMD.2018.8558973.
XXIV. J. Liu, T. Su, H. Lv, L. Lin, and B. Wu, “Six-channel diplexer using stub-loaded stepped impedance resonators,” Appl. Comput. Electromagn. Soc. J., vol. 37, no. 10, pp. 1582–1587, 2019, [Online]. Available:
XXV. J. S. G. Hong and M. J. Lancaster, “Microstrip filters for RF/microwave applications,” John Wiley & Sons, 2004.‏
XXVI. J. Xu, et al., “Diplexer-integrated spdt switches with multiple operating modes using common fractal stub-loaded resonator,” IEEE Transactions on Microwave Theory and Techniques, vol. 69, no. 2, pp. 1464-1473, 2020, doi: 10.1109/TMTT.2019.2892732.
XXVII. J. Xu, F. Liu, Z. Y. Feng, and Y. F. Guo, “Diplexer-Integrated SPDT Switches with Multiple Operating Modes Using Common Fractal Stub-Loaded Resonator,” IEEE Trans. Microw. Theory Tech., vol. 69, no. 2, pp. 1464–1473, 2021, doi: 10.1109/TMTT.2020.3039603.
XXVIII. J. Xu, Z. Y. Chen, and H. Wan, “Lowpass-bandpass triplexer integrated switch design using common lumped-element triple-resonance resonator technique,” IEEE Trans. Ind. Electron., vol. 67, no. 1, pp. 471–479, 2020, doi: 10.1109/TIE.2019.2898579.
XXIX. J. Zhou, J. L. Li, C. G. Sun, H. Li, and S. S. Gao, “A novel microstrip diplexer based on coupled line,” Electromagnetics, vol. 38, no. 2, pp. 87–95, 2018, doi: 10.1080/02726343.2018.1436668.
XXX. J.-G. Liang, W.-L. Chen, and G.-M. Wang, “Harmonics suppression microstrip diplexer for 3G wireless communication system using fractal‐shaped geometry,” Microwave and Optical Technology Letters, vol. 49, no. 12, pp. 2973-2975, 2007.
XXXI. K. Al-Majdi and Y. S. Mezaal, “Microstrip diplexer for recent wireless communities,” Period. Eng. Nat. Sci., vol. 10, no. 1, pp. 387–396, 2022, doi: 10.21533/pen.v10i1.2664.

XXXII. K. D. Xu, M. Li, Y. Liu, Y. Yang, and Q. H. Liu, “Design of Triplexer Using E-Stub-Loaded Composite Right-/Left-Handed Resonators and Quasi-Lumped Impedance Matching Network,” IEEE Access, vol. 6, pp. 18814–18821, 2018, doi: 10.1109/ACCESS.2018.2819641.
XXXIII. M. A. Sazali, N. A. Shairi, and Z. Zakaria, “Hybrid microstrip diplexer design for multi-band WiMAX application in 2.3 and 3.5 GHz bands,” Int. J. Electr. Comput. Eng., vol. 8, no. 1, pp. 576–584, 2018, doi: 10.11591/ijece.v8i1.pp576-584.
XXXIV. M. Hayati, A. R. Zarghami, S. Zarghami, and S. Alirezaee, “Designing a miniaturized microstrip lowpass-bandpass diplexer with wide stopband by examining the effects between filters,” AEU – Int. J. Electron. Commun., vol. 139, p. 153912, 2021, doi:
XXXV. M. Q. Dinh and M. Thuy Le, “Triplexer-Based Multiband Rectenna for RF Energy Harvesting from 3G/4G and Wi-Fi,” IEEE Microw. Wirel. Components Lett., vol. 31, no. 9, pp. 1094–1097, 2021, doi: 10.1109/LMWC.2021.3095074.
XXXVI. P. H. Deng, S. W. Lei, W. Lo, and M. W. Li, “Novel Diplexer and Triplexer Designs Avoiding Additional Matching Circuits Outside Filters,” IEEE Access, vol. 8, pp. 14714–14723, 2020, doi: 10.1109/ACCESS.2020.2966262.
XXXVII. S. Ben Haddi, A. Zugari, and A. Zakriti, “Low Losses and Compact Size Microstrip Diplexer Based on Open-Loop Resonators with New Zigzag Junction for 5G Sub-6-GHz and Wi-Fi Communications,” Prog. Electromagn. Res. Lett., vol. 102, pp. 109–117, 2022, doi: 10.2528/PIERL21120305.
XXXVIII. S. H. Esmaeli and S. H. Sedighy, “A compact size, high isolation and low insertion loss microstrip diplexer,” J. Circuits, Syst. Comput., vol. 27, no. 13, 2018, doi: 10.1142/S0218126618502110.
XXXIX. T. H. Le, X. W. Zhu, C. Ge, and T. V. Duong, “A Novel Diplexer Integrated with a Shielding Case Using High Q -Factor Hybrid Resonator Bandpass Filters,” IEEE Microw. Wirel. Components Lett., vol. 28, no. 3, pp. 215–217, 2018, doi: 10.1109/LMWC.2018.2804174.
XL. T. Upadhyaya, J. Pabari, V. Sheel, A. Desai, R. Patel, and S. Jitarwal, “Compact and high isolation microstrip diplexer for future radio science planetary applications,” AEU – Int. J. Electron. Commun., vol. 127, 2020, doi: 10.1016/j.aeue.2020.153497.

XLI. X. Bi, Q. Ma, C. Ning, and Q. Xu, “A Compact Switchable Filtering Diplexer Based on Reused L-Shaped Resonator,” IEEE Trans. Circuits Syst. II Express Briefs, vol. 65, no. 12, pp. 1934–1938, 2018, doi: 10.1109/TCSII.2018.2810066.
XLII. X. Guan, M. Xu, B. Ren, W. Liu, X. Zhang, and B. Zhao, “High Isolated and Wide Stopband Switchable Diplexer with Inserted Lowpass Filter,” 2020. 10.1109/CSRSWTC50769.2020.9372460.
XLIII. X. Guan, W. Liu, B. Ren, H. Liu, and P. Wen, “A Novel Design Method for High Isolated Microstrip Diplexers without Extra Matching Circuit,” IEEE Access, vol. 7, pp. 119681–119688, 2019, doi: 10.1109/ACCESS.2019.2936553.
XLIV. Y. Chu, K. Ma, and Y. Wang, “A novel triplexer based on SISL platform,” IEEE Trans. Microw. Theory Tech., vol. 67, no. 3, pp. 997–1004, 2019, doi: 10.1109/TMTT.2019.2892732.
XLV. Y. F. Tsao, T. J. Huang, H. T. Hsu, and C. W. Wu, “Planar Diplexer Design Using Hairpin Resonators Loaded with External Capacitors for Improvement of Isolation and Stopband Rejection Levels,” in 2019 49th European Microwave Conference, EuMC 2019, 2019, pp. 368–371, doi: 10.23919/EuMC.2019.8910892.
XLVI. Y. S. Mezaal and H. T. Eyyuboglu, “A new narrow band dual-mode microstrip slotted patch bandpass filter design based on fractal geometry,” in 2012 7th International Conference on Computing and Convergence Technology (ICCCT), IEEE, 2012, pp. 1180–1184.
XLVII. Y. S. Mezaal, H. H. Saleh, and H. Al-saedi, “New compact microstrip filters based on quasi fractal resonator,” Adv. Electromagn., vol. 7, no. 4, pp. 93–102, 2018.
XLVIII. Y. S. Mezaal, S. A. Hashim, A. H. Al-fatlawi, and H. A. Hussein, “New microstrip diplexer for recent wireless applications,” Int. J. Eng. Technol., vol. 7, no. 3.4 Special Issue 4, pp. 96–99, 2018, [Online]. Available:
XLIX. Y. Shi, J. Chen, and H. Xu, “Silicon-based on-chip diplexing/triplexing technologies and devices,” Science China Information Sciences, vol. 61, pp. 1-15, 2018.
L. Zhang, L., Liu, D., Jiang, H., & Dai, D. First demonstration of an on-chip quadplexer for passive optical network systems. Photonics Research, vol.9, no.5, pp.757-763, 2021.

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