volume | PIER Journals

Abstract

In this work, a novel planar four-port microstrip triplexer is designed and analyzed to operate at 1.9 GHz, 2.5 GHz, and 3.35 GHz for wireless communication applications. The proposed structure consists of a compact patch and spiral cells. The main advantage of this triplexer is its very compact size, with a cross size of only 15 mm×15 mm (0.017λ_g²). Sharp frequency response at the edges of all passbands, low insertion losses (0.25 dB, 0.4 dB and 0.11 dB), and high return losses (45 dB, 54 dB and 40 dB) in all channels are the other advantages of the designed triplexer. Additionally, the triplexer has reasonable isolations (S₂₃, S₂₄, S₃₄), better than 20 dB. To verify the design method, both EM simulation and measurement results are obtained. The comparison shows that the measured and simulated results are in good agreement, which proves the feasibility of this work.

1. Rezaei, A. and L. Noori, "Novel microstrip quadruplexer with wide stopband for WiMAX applications," Microw. Opt. Technol. Lett., Vol. 60, No. 6, 1491-1495, 2018.
doi:10.1002/mop.31187 Google Scholar

2. Chen, C.-F., T.-M. Shen, T.-Y. Huang, and R.-B. Wu, "Design of compact quadruplexer based on the tri-mode net-type resonators," IEEE Microw. Wirel. Compon. Lett., Vol. 21, No. 10, 534-536, 2011.
doi:10.1109/LMWC.2011.2165278 Google Scholar

3. Noori, L. and A. Rezaei, "Design of a compact narrowband quad-channel diplexer for multi-channel long-range RF communication systems," Analog Integrated Circuits and Signal Processing, Vol. 94, No. 1, 1-8, 2018.
doi:10.1007/s10470-017-1063-7 Google Scholar

4. Hsu, K.-W., W.-C. Hung, and W.-H. Tu, "Design of four-channel diplexer using distributed coupling technique," Microw. Opt. Technol. Lett., Vol. 58, 166-170, 2016.
doi:10.1002/mop.29516 Google Scholar

5. Rezaei, A. and L. Noori, "Novel low-loss microstrip triplexer using coupled lines and step impedance cells for 4G and WiMAX applications," Turkish Journal of Electrical Engineering & Computer Sciences, No. 26, 1871-1880, 2018.
doi:10.3906/elk-1708-48 Google Scholar

6. El-Tokhy, A., R. Wu, and Y. Wang, "Microstrip triplexer using a common triple-mode resonator," Microw. Opt. Technol. Lett., Vol. 60, No. 7, 1815-1820, 2018.
doi:10.1002/mop.31244 Google Scholar

7. Chen, C.-F., T.-M. Shen, T.-Y. Huang, and R.-B. Wu, "Design of multimode net-type resonators and their applications to filters and multiplexers," IEEE Trans. Microw. Theory Tech., Vol. 59, No. 4, 848-856, 2011.
doi:10.1109/TMTT.2011.2109392 Google Scholar

8. Jin, X. and Z. Yan, "Microstrip triplexer and switchable triplexer using new impedance matching circuits," Int. J. RF Microw. Comput. Aided Eng., Vol. 27, e21057, doi:10.1002/mmce.21057. Google Scholar

9. Percaz, J. M., M. Chudzik, I. Arnedo, I. Arregui, F. Teberio, M. A. G. Laso, and T. Lopetegi, "Producing and exploiting simultaneously the forward and backward coupling in EBG-assisted microstrip coupled lines," IEEE Antennas Wirel. Propag. Lett., Vol. 15, 873-876, 2015. Google Scholar

10. Tang, C.W. and M. G. Chen, "Packaged microstrip triplexer with star-junction topology," Electron. Lett., Vol. 48, 699-701, 2012.
doi:10.1049/el.2012.0469 Google Scholar

11. Huang, Y., G. Wen, and J. Li, "Compact microstrip triplexer based on twist-modified asymmetric split-ring resonators," Electron. Lett., Vol. 50, 1712-1713, 2014.
doi:10.1049/el.2014.2805 Google Scholar

12. Wu, H.-W., S.-H. Huang, and Y.-F. Chen, "Compact microstrip triplexer based on coupled step impedance resonator," IEEE MTT-S International Microwave Symposium Digest (IMS), 2013. Google Scholar

13. Chen, F.-C., J.-M. Qiu, H.-T. Hu, Q.-X. Chu, and M. J. Lancaster, "Design of microstrip lowpassband-pass triplexer with high isolation," IEEE Microw. Wirel. Compon. Lett., Vol. 25, No. 12, 805-807, 2015.
doi:10.1109/LMWC.2015.2496797 Google Scholar

14. Deng, P.-H., M.-I. Lai, S.-K. Jeng, and Ch. H. Chen, "Design of matching circuits for microstrip triplexers based on stepped-impedance resonators," IEEE Trans. Microw. Theory Tech., Vol. 54, No. 12, 4185-4192, 2006.
doi:10.1109/TMTT.2006.886161 Google Scholar

15. Lin, S. C. and C. Y. Yeh, "Design of microstrip triplexer with high isolation based on parallel coupled-line filters using T-shaped short-circuited resonators," IEEE Microw. Wirel. Compon. Lett., Vol. 25, No. 10, 648-650, 2015.
doi:10.1109/LMWC.2015.2463215 Google Scholar

16. Sugchai, T., I. Nattapong, and C. Apirun, "Design of microstrip triplexer using common dual-mode resonator with multi-spurious mode suppression for multiband applications," Appl. Mech. Mater, Vol. 763, 182-188, 2015.
doi:10.4028/www.scientific.net/AMM.763.182 Google Scholar

17. Zhu, C., J. Zhou, and Y. Wang, "Design of microstrip planar triplexer for multimode/multi-band wireless systems," Microwave J., 1-19, 2010. Google Scholar

18. Wu, J.-Y., K.-W. Hsu, Y.-H. Tseng, and W.-H. Tu, "High-isolation microstrip triplexer using multiple-mode resonators," IEEE Microw. Wirel. Compon. Lett., Vol. 22, No. 4, 173-175, 2012.
doi:10.1109/LMWC.2012.2189101 Google Scholar

19. Chinig, A., A. Errkik, L. El Abdellaoui, A. Tajmouati, J. Zbitoum, and M. Latrach, "Design of a microstrip diplexer and triplexer using open loop resonators," J. Microw. Optoelectron. Electromagn. Appl., Vol. 16, No. 2, 65-80, 2016.
doi:10.1590/2179-10742016v15i2602 Google Scholar

20. Karlsson, M., P. HÅkansson, and S. Gong, "A frequency triplexer for ultra-wideband systems utilizing combined broadside- and edge-coupled filters," IEEE Trans. Adv. Packag., Vol. 31, No. 4, 794-801, 2008.
doi:10.1109/TADVP.2008.2004415 Google Scholar

Dr. Abbas Rezaei

Prof. Salah Yahya

Dr. Saman Moradi

Dr. Mohd Haizal Jamaluddin