Miniaturized microstrip diplexer with high performance using a novel structure for wireless L-band applications

  • A. RezaeiEmail author
  • L. Noori


This paper presents a high-performance microstrip diplexer based on the coupled triangular microstrip cells. The proposed diplexer has a compact size of 0.018 λg2. It is designed to work at 1 GHz for aeronautical military systems and aeronautical navigation and 1.3 GHz for active sensors, GNSS repeaters, radiolocation, and satellite systems. The low insertion and return losses better than 0.21 dB and 25 dB respectively, are obtained at both channels. Another advantage of this diplexer is high isolation of 40 dB between its channels. Moreover, the 1st, 2nd and 3rd harmonics are suppressed with a maximum level of − 30 dB. The designing process is based on proposing an LC model of a novel microstrip cell. Then, the effective parameter on the resonance frequency is found. To verify the designing method, the introduced diplexer is simulated, fabricated and measured. The simulation results are in a good agreement with the measurements.


Diplexer Microstrip Compact High performance Wireless communication 


  1. 1.
    Zhu, C., Xu, J., Kang, W., & Wu, W. (2018). Synthesis design of microstrip triple-passband dual-stopband filter based on λ/4 uniform-impedance resonators. IEEE Microwave and Wireless Components Letters, 28(3), 209–211.CrossRefGoogle Scholar
  2. 2.
    Gholami, M., & Yagoub, M. (2018). Integrated microstrip-to-waveguide transition with microstrip directional coupler. IEEE Microwave and Wireless Components Letters, 28(5), 389–391.CrossRefGoogle Scholar
  3. 3.
    Deng, P., Lai, M., Jeng, S., & Chen, C. (2006). Design of matching circuits for microstrip triplexers based on stepped impedance resonators. IEEE Microwave and Wireless Components Letters, 54(12), 4185–4192.Google Scholar
  4. 4.
    Rezaei, A., & Noori, L. (2018). Novel microstrip quadruplexer with wide stopband for WiMAX applications. Microwave and Optical Technology Letters, 60(6), 1491–1495.CrossRefGoogle Scholar
  5. 5.
    Salehi, M. R., Keyvan, S., Abiri, E., & Noori, L. (2016). Compact microstrip diplexer using new design of triangular open loop resonator for 4G wireless communication systems. AEU-International Journal of Electronics and Communications, 70(7), 961–969.CrossRefGoogle Scholar
  6. 6.
    Feng, W., Zhang, Y., & Che, W. (2017). Tunable dual-band filter and diplexer based on folded open loop ring resonators. IEEE Transactions on Circuits and Systems, 64(9), 1047–1051.Google Scholar
  7. 7.
    Guan, X., Su, H., Yang, F., Wen, P., & Ma, Z. (2017). Microstrip diplexer based on common dual-band filter. IEICE Electronics Express, 14(16), 1–6.CrossRefGoogle Scholar
  8. 8.
    Bui, D. H. N., Vuong, T. P., Allard, B., Verdier, J., & Benech, P. (2017). Compact low-loss microstrip diplexer for RF energy harvesting. Electronics Letters, 53(8), 552–554.CrossRefGoogle Scholar
  9. 9.
    Noori, L., & Rezaei, A. (2017). Design of a microstrip dual-frequency diplexer using microstrip cells analysis and coupled lines components. International Journal of Microwave and Wireless Technologies, 9(7), 1467–1471.CrossRefGoogle Scholar
  10. 10.
    Chinig, A. (2017). A novel design of microstrip diplexer using meander-line resonators. International Journal of Electronic Engineering and Computer Science, 2(2), 5–10.Google Scholar
  11. 11.
    Rezaei, A., Noori, L., & Mohamadi, H. (2017). Design of a novel compact microstrip diplexer with low insertion loss. Microwave and Optical Technology Letters, 59(7), 1672–1676.CrossRefGoogle Scholar
  12. 12.
    Guan, X., Yang, F., Liu, H., & Zhu, L. (2014). Compact and high-isolation diplexer using dual-mode stub-loaded resonators. IEEE Microwave Wireless Components Letters, 24(6), 385–387.CrossRefGoogle Scholar
  13. 13.
    Jun-Mei, Y., Zhou, H.-Y., & Cao, L.-Z. (2016). Compact diplexer using microstrip half- and quarter-wavelength resonators. Electronics Letters, 52(19), 1613–1615.CrossRefGoogle Scholar
  14. 14.
    Noori, L., & Rezaei, A. (2017). Design of a microstrip diplexer with a novel structure for WiMAX and wireless applications. AEU-International Journal of Electronics and Communications, 77, 18–22.CrossRefGoogle Scholar
  15. 15.
    Peng, H., & Chiang, Y. (2015). Microstrip diplexer constructed with new types of dual-mode ring filters. IEEE Microwave Wireless Components Letters, 25(1), 7–9.CrossRefGoogle Scholar
  16. 16.
    Huang, F., Wang, J., Zhu, L., & Wu, W. (2016). Compact microstrip balun diplexer using stub-loaded dual-mode resonators. Electronics Letters, 52, 1994–1996.CrossRefGoogle Scholar
  17. 17.
    Chuang, M.-L., & Wu, M.-T. (2011). Microstrip diplexer design using common T-shaped resonator. IEEE Microwave and Wireless Components Letters, 21(11), 583–585.CrossRefGoogle Scholar
  18. 18.
    Noori, L., & Rezaei, A. (2018). Design of a compact narrowband quad-channel diplexer for multi-channel long-range RF communication systems. Analog Integrated Circuits and Signal Processing, 94(1), 8-1.CrossRefGoogle Scholar
  19. 19.
    Chaudhary, G., Jeong, Y., & Lim, J. (2014). Microstrip line negative group delay filters for microwave circuits. IEEE Transactions on Microwave Theory and Techniques, 62(2), 234–243.CrossRefGoogle Scholar
  20. 20.
    Noori, L., & Rezaei, A. (2017). Design of microstrip wide stopband quad-band bandpass filters for multi-service communication systems. AEU-International Journal of Electronics and Communications, 81, 136–142.CrossRefGoogle Scholar
  21. 21.
    Tizyi, H., Riouch, F., Tribak, A., Najid, A., & Mediavilla, A. (2018). Microstrip diplexer design based on two square open loop bandpass filters for RFID applications. International Journal of Microwave and Wireless Technologies, 10(4), 412–421.CrossRefGoogle Scholar
  22. 22.
    Sasipriya, S., & Aparna, B. (2018). Compact microstrip diplexer using bandstop filters for GSM and WLAN applications. International Journal of Pure and Applied Mathematics, 119(12), 1395–1401.Google Scholar
  23. 23.
    Li, Q., Zhang, Y., & Wu, C.-T. M. (2017). Compact and high-isolation microstrip diplexer using distributed coupling feeding line. Microwave and Optical Technology Letters, 60(1), 192–196.CrossRefGoogle Scholar
  24. 24.
    Feng, W., Hong, M., & Che, W. (2016). Microstrip diplexer design using open/shorted coupled lines. Progress In Electromagnetics Research Letters, 59, 123–127.CrossRefGoogle Scholar
  25. 25.
    Nath, M. (2012). Design and characterization of microstrip diplexer. International Journal of Engineering Trends and Technology, 3(2), 183–186.Google Scholar
  26. 26.
    Chinig, A., Zbitou, J., Errkik, A., Elabdellaoui, L., Tajmouati, A., Tribak, A., et al. (2015). A new microstrip diplexer using coupled stepped impedance resonators. International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering, 9(1), 41–44.Google Scholar
  27. 27.
    Yang, T., Chi, P. L., & Itoh, T. (2010). High isolation and compact diplexer using the hybrid resonators. IEEE Microwave and Wireless Components Letters, 20(10), 551–553.CrossRefGoogle Scholar
  28. 28.
    Liu, H. W., Xu, W. Y., Zhang, Z. C., & Guan, X. (2013). Compact diplexer using slotline stepped impedance resonator. IEEE Microwave and Wireless Components Letters, 23(2), 75–77.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Electrical EngineeringKermanshah University of TechnologyKermanshahIran

Personalised recommendations