Vol. 114

Front:[PDF file] Back:[PDF file]
Latest Volume
All Volumes
All Issues

A Novel Miniaturized L-Band Filter with Great Stopband Characteristics Using Interdigitated Coupled Lines CRLH-TL Structure

By Peng Wang, Kaiyue Duan, Minquan Li, Man Zhang, and Baokun Jin
Progress In Electromagnetics Research C, Vol. 114, 57-67, 2021


This paper proposes a novel bandpass filter for L-band based on CRLH TL, which is mainly formed by coupling a high-pass characteristic module with a low-pass characteristic module in a cascade. The high-pass module consists of an interdigitated coupled line and a grounding via, owning to its singular characteristics, which the miniaturization is realized. The low-pass module is composed of a C-type resonator with high-low impedance lines, which can realize great sideband attenuation characteristics. To further improve its out-of-band rejection characteristics, a complementary split-ring resonator (CSRR) defective ground structure with single-pole attenuation characteristics is loaded, and a transmission zero is introduced at 2.5f0 out-of-band. The test results are in great agreement with the simulation ones, and the dimensions are only 0.20λg*0.22λg. Compared with other similar types, the filter proposed in this paper has miniaturization, great passband selection characteristics, stopband characteristics, and the advantage of low insertion loss.


Peng Wang, Kaiyue Duan, Minquan Li, Man Zhang, and Baokun Jin, "A Novel Miniaturized L-Band Filter with Great Stopband Characteristics Using Interdigitated Coupled Lines CRLH-TL Structure," Progress In Electromagnetics Research C, Vol. 114, 57-67, 2021.


    1. Wang, C.-X., et al., "Cellular architecture and key technologies for 5G wireless communication networks," IEEE Communications Magazine, Vol. 52, No. 2, 122-130, 2014.

    2. Chu, C. and X. Liao, "Modeling of an 8–12 GHz receiver front-end based on an in-line MEMS frequency discriminator," Solid State Electronics, Vol. 144, No. 7, 54-59, 2018.

    3. Hong, J. S., "Microstrip filters for RF/microwave applications," IEEE Microwave Magazine, Vol. 3, No. 3, 62-65, 2002.

    4. Veselago, V. G., "The electrodynamics of substances with simultaneously negative values of ε and μ," Physics-Uspekhi, Vol. 10, No. 4, 509-514, 1968.

    5. Pendry, J., et al., "Magnetism from conductors and enhanced nonlinear phenomena," IEEE Transactions on Microwave Theory & Techniques, Vol. 47, No. 11, 2075-2084, 1999.

    6. Smith, D. R., et al., "Composite medium with simultaneously negative permeability and permittivity," Physical Review Letters, Vol. 84, No. 18, 4184-4178, 2000.

    7. Eleftheriades, G. V., A. K. Iyer, and P. C. Kremer, "Planar negative refractive index media using periodically L-C loaded transmission lines," IEEE Transactions on Microwave Theory & Techniques, Vol. 50, No. 12, 2702-2712, 2002.

    8. Keshavarz, S. and N. Nozhat, "“Dual-band Wilkinson power divider based on composite right/left-handed transmission lines," 13th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 2016.

    9. Keshavarz, S., R. Keshavarz, and A. Abdipour, "Compact active duplexer based on CSRR and interdigta loaded microstrip coupled lines for LTE application," Progress In Electromagnetics Research C, Vol. 109, 27-37, 2021.

    10. Keshavarz, S., et al., "Design and implementation of low loss and compact microstrip triplexer using CSRR loaded coupled lines," AEU --- International Journal of Electronics and Communications, Vol. 111, 152913-152913, 2019.

    11. Gong, J. Q. and Q. X. Chu, "Miniaturized microstrip bandpass filter using coupled SCRLH zerothorder resonators," Microwave & Optical Technology Letters, Vol. 51, No. 12, 2985-2989, 2009.

    12. Sanz, V., et al., "Balanced right/left-handed coplanar waveguide with stub-loaded split-ring resonators," IEEE Antennas and Wireless Propagation Letters, Vol. 65, No. 13, 193-196, 2014.

    13. Chu, Q.-X., et al., "Compact ultra-wideband filter with dual notched bands based on complementary split ring resonators," Microwave and Optical Technology Letters, Vol. 52, No. 11, 2509-2512, 2010.

    14. Choudhary, D. K. and R. K. Chaudhary, "Vialess wideband bandpass filter using CRLH transmission line with semi-circular stub," International Conference on Microwave and Photonics (ICMAP), 1-2, 2015.

    15. Zhang, H., W. Kang, and W. Wu, "Miniaturized dual-band differential filter based on CSRR-loaded dual-mode SIW cavity," IEEE Microwave and Wireless Components Letters, Vol. 28, No. 10, 897-899, 2018.

    16. Iyer, A. K. and G. V. Eleftheriades, "Negative refractive index metamaterials supporting 2-D waves," IEEE MTT-S International Microwave Symposium Digest, Vol. 2, No. 10, 1067-1070, 2002.

    17. Wu, Y. M., "Design of phase-shifter using composite right-left handed transmission line," Journal of Antennas, Vol. 06, No. 4, 61-69, 2017.

    18. Park, J.-I., et al., "Modeling of a photonic bandgap and its application for the low-pass filter design," Asia Pacific Microwave Conference, Vol. 2, No. 10, 331-334, 1999.

    19. Ahn, D., et al., "A design of the low-pass filter using the novel microstrip defected ground structure," IEEE Transactions on Microwave Theory & Techniques, Vol. 49, No. 1, 86-93, 2001.

    20. Gómez-García, R., et al., "Balanced symmetrical quasireflectionless single-and dual-band bandpass planar filters," IEEE Microwave and Wireless Components Letters, Vol. 28, No. 9, 798-800, 2018.

    21. Jones, T. R. and M. Daneshmand, "Miniaturized slotted bandpass filter design using a ridged half-mode substrate integrated waveguide," IEEE Microwave and Wireless Components Letters, Vol. 29, No. 5, 334-336, 2016.

    22. Luo, C., et al., "Quasi-reflectionless microstrip bandpass filters using bandstop filter for out-of-band improvement," IEEE Transactions on Circuits and Systems II, Vol. 1109, No. 10, 1849-1853, 2019.

    23. Psychogiou, D. and R. Gómez-García, "Multi-mode-cavity-resonator-based bandpass filters with multiple levels of transfer-function adaptivity," IEEE Access, Vol. 1109, No. 10, 24759-24765, 2019.

    24. Chen, C., "A coupled-line coupling structure for the design of quasi-elliptic bandpass filters," IEEE Transactions on Microwave Theory and Techniques, Vol. 66, No. 4, 1921-1925, 2018.

    25. Zhang, M., et al., "A novel miniaturized bandpass filter basing on stepped-impedance resonator," Progress In Electromagnetics Research Letters, Vol. 97, 77-85, 2021.

    26. Li, M. and K. D. Xu, "Miniaturized bandpass filter using E-stub loaded CRLH-TL resonator," 17th International Symposium on Communications and Information Technologies (ISCIT), 1-3, 2017.

    27. Numan, A. B. and M. S. Sharawi, "Extraction of material parameters for metamaterials using a full-wave simulator [Education Column]," IEEE Antennas and Propagation Magazine, Vol. 55, No. 5, 202, 2014.

    28. Ca Loz, C. and T. Itoh, "Transmission line approach of Left-Handed (LH) materials and microstrip implementation of an artificial LH transmission line," IEEE Trans. Antennas & Propag., Vol. 52, No. 5, 1159-1166, 2004.