A Reconfigurable Compact Coupled Line Multiple-Band Bandpass Filter

Abstract:

This study proposes a circuit structure with reconfigurable multiple bands bandpass filter. This circuit can provide a triple-band or dual-band bandpass facility by adjusting two open stubs (L6 and L7) location. The circuit design used three sections of transmission line in series, the two sets of the coupled lines connected to the gap in each transmission line, and two open stubs in the appropriate locations. The design and manufacturing of the circuit structure is innovative and simple. The center frequencies of the triple-band bandpass filter are set at 2.4, 4.2, and 6.5 GHz, respectively, while the center frequencies of the dual-band bandpass filter are the two lower pass band of the triple-band bandpass filter at 2.4 and 4.2GHz. The filters were simulated using the full-wave electromagnetic simulator, IE3D, and measured by Anritsu-37269D. The simulated and measured results show good agreement in the frequency of interest.

• Periodical: Advanced Materials Research (Volumes 655-657)
• Pages: 1555-1561
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.655-657.1555
• Online since: January 2013
• Authors: Wen Ko, Man Long Her, Ming Wei Hsu, Yu Lin Wang
• Keywords: Bandpass Filter (BPF), Coupled Line, Dual-Band, Multiple- Band, Open Stubs, Transmission Line, Triple-Band

References

[1] Sha Luo, Lei Zhu, Sheng Sun "Compact Dual-Mode Triple Band Bandpass Filters Using Three Pairs of Degenerate Modes in a Ring Resonator, IEEE Trans. Microwave Theory Techniques, Vol. 59, no. 5, may (2011).

DOI: 10.1109/tmtt.2011.2123106

[2] Q.X. Chu, and X.M. Lin, Advanced triple-band bandpass filter using tri-section S.I.R., ELECTRONICS LETTERS volume: 44, Issue: 4 (2008), page(s): 295-296.

DOI: 10.1049/el:20083096

[3] Q.X. Chu, F.C. Chen, Z.H. Tu., and H. Wang, A novel cross resonator and its applications to bandpass filters, IEEE Trans. Microwave Theory Tech. 57 (2009), 1753-1759.

DOI: 10.1109/tmtt.2009.2022873

[4] W.Y. Chen, S.J. Chang, M.H. Weng, Y.H. Su, and H. Kuan, Simple method to design a tri-band bandpass filter using asymmetric SIR for GSM, Microw. Opt. Tech. Lett. 53 (2011), 1573-1576.

DOI: 10.1002/mop.26037

[5] D. Packiaraj, M. Ramesh and A.T. Kalghatgi, Design of a tri-section folded SIR filter, IEEE Microwave and Wireless Components Letters 16 (2006).

DOI: 10.1109/lmwc.2006.873459

[6] C.F. Chen, T.Y. Huang, and R.B. Wu, Design of dual and triple-passband filters using alternately cascaded multiband resonators, IEEE Trans. Microwave Theory Tech. 54 (2006), 3550-3558.

DOI: 10.1109/tmtt.2006.880653

[7] Wen Ko, and Man-Long Her, Design and implementation of asymmetric coupled SIR dual-band bandpass filter, PIERS Kuala Lumpur, Malaysia 27-30March 2012.

[8] N.Z. Zakaria, M.K. Mohd Salleh, Z. Ismail Khan, N. Ab Wahab, and Z. Awamh, Frequency shifting of microstrip ring filter using open stubs, Proceeding of 2010 IEEE (SCOReD 2010).

DOI: 10.1109/scored.2010.5703964

[9] Li Li, Ting-Ting An, Wen-Wen Wang, and Wen-Mei Zhang, A square ring dual-band filter with adjustable second-passband by the open stubs, ICMMT2008 Proceedings.

DOI: 10.1109/icmmt.2008.4540365

[10] Rajesh Mongia, Inder Bahl, and Prakash Bhartia, RF and microwave coupled-line circuits, Artech House (1999).