PIER Letters
Progress In Electromagnetics Research Letters
ISSN: 1937-6480
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By S. Gao, S.-Q. Xiao, and J.-L. Li

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A novel miniaturized microstrip dual-mode filter using a half wavelength resonator with centrally loaded open stub and quasi-L shaped feed-lines is proposed. The advantage of using such a resonator is inherently generating a transmission zero by itself. To further improve the selectivity, quasi-L shaped feed-lines are introduced to create additional transmission zeros. Theoretical and simulated analyses of this filter are performed. A demonstration filter centered at 2.33 GHz with a fractional bandwidth of 4.7% is designed, fabricated and measured to validate the design methodology.

S. Gao, S.-Q. Xiao, and J.-L. Li, "Miniaturized Microstrip Dual-Mode Filter with Three Transmission Zeros," Progress In Electromagnetics Research Letters, Vol. 31, 199-207, 2012.

1. Luo, S., L. Zhu, and S. Sun, "A dual-mode dual-band bandpass filter using a single slot ring resonator," Progress In Electromagnetics Research Letters, Vol. 23, 173-180, 2011.

2. Zhang, L., Z.-Y. Yu, and L. Guo, "Compact planar triple-mode bandpass filter with enhanced parasitic coupling," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 4, 495-503, 2010.

3. Tyurnev, V. V. and A. M. Serzhantov, "Dual-mode split microstrip resonator for compact narrowband bandpass filters," Progress In Electromagnetics Research C, Vol. 23, 151-160, 2011.

4. Esfeh, B. K., A. Ismail, R. S. A. Raja Abdullah, H. Adam, and A. R. H. Alhawari, "Compact narrowband bandpass filter using dual-mode octagonal meandered loop resonator for WiMAX application ," Progress In Electromagnetics Research B, Vol. 16, 277-290, 2009.

5. Wang, Y. X., B.-Z. Wang, and J. P. Wang, "A compact square loop dual-mode bandpass filters with wide stop-band," Progress In Electromagnetics Research, Vol. 77, 67-73, 2007.

6. Wolff, I., "Microstrip bandpass filter using degenerate modes of a microstrip ring resonator," Electron. Lett., Vol. 8, No. 2, 302-303, Jun. 1972.

7. Hong, J.-S. and M. J. Lancaster, "Microstrip bandpass FIlter using degenerate modes of a novel meander loop resonator," IEEE Microw. Guided Wave Lett., Vol. 5, No. 11, 371-372, Nov. 1995.

8. Zhu, L., P.-M. Wecowski, and K. Wu, "New planar dual-mode filter using cross-slotted patch resonator for simultaneous size and loss reduction," IEEE Trans. Microw. Theory Tech., Vol. 47, No. 5, 650-654, May 1999.

9. Zhu, L., C. T. Boon, and S. J. Quek, "Miniaturized dual-mode bandpass filter using inductively loaded cross-slotted patch resonator," IEEE Microw. Wireless Compon. Lett., Vol. 15, No. 1, 22-24, Jan. 2005.

10. Mao, R.-J. and X.-H. Tang, "Novel dual-mode bandpass filters using hexagonal loop resonators," IEEE Trans. Microw. Theory Tech., Vol. 54, No. 9, 3526-3533, Sep. 2006.

11. Mao, R.-J., X.-H. Tang, and F. Xiao, "Miniaturized dual-mode ring bandpass filters with patterned ground plane," IEEE Trans. Microw. Theory Tech., Vol. 55, No. 7, 1539-1547, Jul. 2007.

12. Hong, J.-S., H. Shaman, and Y.-H. Chun, "Dual-mode microstrip open-loop resonators and filters," IEEE Trans. Microw. Theory Tech., Vol. 55, No. 8, 1764-1770, Aug. 2007.

13. Zhang, X.-C., Z.-Y. Yu, and J. Xu, "Design of microstrip dual-mode filters based on source-load coupling," IEEE Microw. Wireless Compon. Lett., Vol. 18, No. 10, 677-679, Oct. 2008.

14. Li, L. and Z.-F. Li, "Application of inductive source-load coupling in microstrip dual-mode filter design," Electron. Lett., Vol. 45, No. 2, 141-142, Jan. 2010.

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