Compact Dual-Wideband BPF Based on Quarter-Wavelength Open Stub Loaded Half-Wavelength Coupled-Line
Keywords:
Bandpass filter (BPF), coupled-line, dual-wideband, stub-loaded resonatorAbstract
In this paper, a novel dual-wideband bandpass filter (BPF) is presented by using quarterwavelength open stub loaded half-wavelength coupledline. Equivalent voltage-current analysis method is applied to analyze this structure, which shows it has two tunable transmission zeros and dual-wideband frequency response. As an example, a dual-wideband BPF covering 1.228/1.57/6.8 GHz for GPS (Link 1 and Link 2) and RFID applications is designed, fabricated and measured. The fabricated filter has a compact size of 0.043g × 0.213g. The measured results show that the fabricated filter has the merits of low insertion loss, good return loss and high band-to-band isolation. The proposed dual-band BPF also has a very simple physical topology and quick design procedure.
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References
X.-Y. Zhang, J. Shi, J.-X. Chen, and Q. Xue, “Dual-band bandpass filter design using a novel feed scheme,” IEEE Microw. Wireless Compon. Lett., vol. 19, no. 6, pp. 350-352, Jun. 2009.
M. Jiang, L.-M. Chang, and A. Chin, “Design of dual-passband microstrip bandpass filters with multi-spurious suppression,” IEEE Microw. Wireless Compon. Lett., vol. 20, no. 4, pp. 199- 201, Apr. 2010.
F. C. Chen, Q. X. Chu, Z. H. Li, and X. H. Wu, “Compact dual-band bandpass filter with controllable bandwidths using stub loaded multiple-mode resonator,” IET Microw. Antennas Propag., vol. 6, no. 10, pp. 1172-1178, Nov. 2012.
J. Xu, W. Wu, and C. Miao, “Compact and sharp skirts microstrip dual-mode dual-band bandpass filter using a single quadruple-mode resonator (QMR),” IEEE Trans. on Microw. Theory Tech., vol. 61, no. 3, pp. 1104-1113, Mar. 2013.
S. Lee and Y. Lee, “A planar dual-band filter based on reduced-length parallel coupled lines,” IEEE Microw. Wireless Compon. Lett., vol. 20, no. 1, pp. 16-18, Jan. 2010.
S. Lee and Y. Lee, “A uniform coupled-line dualband filter with different bandwidths,” IEEE Microw. Wireless Compon. Lett., vol. 20, no. 10, pp. 545-547, Oct. 2010.
J. Xu, C. Miao, and W. Wu, “A compact and high isolation dual-mode dual-band bandpass filter with tunable transmission zeros,” J. of Electromagn. Waves and Appl., vol. 26, no. 17-18, pp. 2390-2397, Dec. 2012.
J. Xu and W. Wu, “Compact microstrip dual-mode dual-band bandpass filters using stubs loaded coupled line,” Progress In Electromagnetics Research C, vol. 41, pp. 137-150, 2013.
I. Z. George and A. K. Johnson, “Coupled transmission line networks in an inhomogeneous dielectric medium,” IEEE Trans. on Microw. Theory Tech., vol. 17, no. 10, pp. 753-759, Oct. 1969.
