A Compact Narrow Band-Pass Filter Based on Composite Right-Left Handed Structures for WLAN Application

Document Type : Original Article

Authors

1 Department of Electrical Engineering, Vali-E-Asr University of Rafsanjan, Rafsanjan, Iran

2 Department of Electrical Engineering, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran

Abstract

A new topology for the design of microwave narrow band-pass filters (NBPFs) with wide out of band rejection and sharp edges, based on the use of Composite Right-Left Handed (CRLH) Transmission Line (TL) concept is presented. The proposed NBPF has been realized by using two different sections. The left-handed section is implemented by etching spiral complementary split ring resonator (SCSRR) unit-cell in the ground plane as well as series interdigital capacitors in the upper metal level while the right-handed section is implemented by etching SCSRR unit-cell in the ground plane and conventional microstrip transmission line shorted via a hole in the upper metal level. Accordingly, CRLH transmission line concept is implemented by this configuration which acts as a narrow band-pass filter. Because of the smaller electrical size of spiral resonators, the total electrical size of the proposed NBPF can be reduced by using this proposed configuration. Compared with some other reported NBPFs, the presented NBPF has great improvements in size reduction and selectivity. Consequently, a compact NBPF is designed which exhibits extremely sharp rejection skirts around the target passband. The equivalent circuit model of the designed filter and full-wave simulation results of the NBPF are also developed. To validate the design concept, the proposed NBPF has been fabricated and tested. Experimental verification is provided and good agreement has been found between simulation and measurement. The proposed NBPF has a passband which covers 2.25 to 2.45 GHz and its measured 3 dB fractional bandwidth is about 8.5%. The total size of the proposed NBPF is 0.25 λg× 0.06 λg, where λg is the guided wavelength at the center passband.

Keywords

References

[1]     C. Caloz and T. Itoh, “Electromagnetic Metamaterials: Transmission Line Theory and Microwave Applications,” John Wiley & Sons, Inc., 2006.
[2]     R. Marques, F. Martin, and M. Sorolla, “Metamaterials with negative parameters: theory, design, and microwave applications,” vol. 183, John Wiley & Sons, 2011.
[3]     F. Martin, “Artificial transmission lines for RF and microwave applications,” John Wiley & Sons, 2015.
[4]     J. Bonache, F. Martín, F. Falcone, J. García, I. Gil, T. Lopetegi, M. A. G. Laso, R. Marqués, F. Medina, and M. Sorolla, “Super compact split ring resonators CPW band pass filters,” In 2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No. 04CH37535), vol. 3, pp. 1483-1486, 2004.
[5]     J .Bonache, G. Ignacio, J. Garcia-Garcia, and F. Martin, “Novel microstrip bandpass filters based on complementary split-ring resonators,” IEEE Transactions on Microwave Theory and Techniques, vol. 54, no. 1, pp. 265-271, 2006.
[6]     J. Bonache, F. Martin, F. Falcone, J. García‐García, I. Gil, T. Lopetegi, M. A. G. Laso, R. Marques, F. Medina, and M. Sorolla, “Compact coplanar waveguide band‐pass filter at the S‐band,” Microwave and Optical Technology Letters vol. 46, no. 1, pp. 33-35, 2005.
[7]     J. Bonache, F. Martin, F. Falcone, J. D. Baena, T. Lopetegi, J. García‐García, M. AG Laso, et al., “Application of complementary split‐ring resonators to the design of compact narrow band‐pass structures in microstrip technology,” Microwave and Optical Technology Letters, vol. 46, no. 5, pp. 508-512, 2005.
[8]     J. Bonache, I. Gil, J. Garcia-Garcia, and F. Martin, “Complementary split rings resonators (CSRRs): Towards the miniaturization of microwave device design,” Journal of computational electronics, vol. 5, no. 2-3, pp. 193-197, 2006.
[9]     J. Bonache, M. Gil, I. Gil, J. Garcia-Garcia, and F. Martin, “Limitations and solutions of resonant-type metamaterial transmission lines for filter applications: the hybrid approach,” In 2006 IEEE MTT-S International Microwave Symposium Digest, pp. 939-942, IEEE, 2006.
[10]  E. Musonda and I. C. Hunter, “Microwave Bandpass Filters Using Re-Entrant Resonators,” Microwave Theory and Techniques, IEEE Transactions on, vol. 63, no. 3, pp.      954-964, 2015.
[11]  M. Danaeian and H. Ghayoumi-Zadeh, “Miniaturized substrate integrated waveguide filter using fractal open complementary split-ring resonators,” International Journal of RF and Microwave Computer-Aided Engineering, vol. 28, no. 5, pp. 1-10, 2018.
[12]  M. Danaeian, K. Afrooz, and A. Hakimi, “Miniaturization of substrate integrated waveguide filters using novel compact metamaterial unit-cells based on SIR technique,”            AEU-International Journal of Electronics and Communications, vol. 84, no. 1, pp. 62-73, 2018.
[13]  A. K. Arani and M. Kanti Mandal, “Narrowband Substrate Integrated Waveguide Bandpass Filter with High Selectivity,” IEEE Microwave and Wireless Components Letters, vol. 28, no. 5, pp. 416-418, 2018.
[14]  Wang, Jianpeng, Feng Huang, Lei Zhu, Chuantao Cai, and Wen Wu, “Study of a new planar-type balun topology for application in the design of balun bandpass filters,” IEEE Transactions on Microwave Theory and Techniques, vol. 64, no. 9, pp. 2824-2832, 2016.
[15]  Lu, Hongshu, Weiwei Wu, Jingjian Huang, Xiaofa Zhang, and Naichang Yuan, “Compact dual-mode microstrip bandpass filter based on greek-cross fractal resonator,” Radioengineering, vol. 26, no. 1, pp. 275-284, 2017.
[16]  J. S. Hong, “Microstrip Filters for RF/Microwave Application,” 2nd Edition, John Wiley & Sons, Inc., 2011.
Applied Electromagnetics
Volume 7, Issue 1 - Serial Number 18
February 2019
Pages 29-38

Files

History

  • Receive Date: 27 March 2019
  • Revise Date: 01 May 2019
  • Accept Date: 03 June 2019
  • Publish Date: 22 May 2019

Share

How to cite

Statistics