By using a composite coupling structure for coplanar waveguide (CPW)/microstrip, a new dual-band bandpass filter (DBBPF) stacking inverted Y-shaped CPW resonators and rectangular ring resonators is proposed. Two resonant frequency bands are simultaneously excited by the CPW feed line, However, it can be convenient to tune individually. Several transmission zeros are realized to improve the selectivity of the filter and achieve wide stopband rejection. Good agreement between simulated and measured results demonstrates the validity of this DBBPF.
2. Zhang, Y. P. and M. Sun, "Dual-band microstrip bandpass filter using stepped-impedance resonators with new coupling schemes," IEEE Tran. Microw. Theory Tech., Vol. 54, No. 10, 3779-3785, 2006.
doi:10.1109/TMTT.2006.882895
3. Zhang, X. Y., J. X. Chen, Q. Xue, and S. M. Li, "Dual-band bandpass filters using stub-loaded resonators," IEEE Microw. Wirel. Compon. Lett., Vol. 17, No. 8, 583-585, 2007.
doi:10.1109/LMWC.2007.901768
4. Wolff, I., Coplanar Microwave Integrated Circuit, John Wiley & Sons, Inc., Hoboken, NJ, USA, 2006.
doi:10.1002/0470040882
5. Shi, J., J. X. Chen, and Q. Xue, "A quasi-elliptic function dual-band bandpass filter stacking spiral-shaped CPW defected ground structure and back-side coupled strip lines," IEEE Microw. Wirel. Compon. Lett., Vol. 17, No. 6, 430-432, 2007.
doi:10.1109/LMWC.2007.897791
6. Al-Khateeb, L. and O. Abu Safia, "Dual-band bandpass filter based on CPW series-connected resonators," IET Electron. Lett., Vol. 49, No. 12, 761-762, 2013.
doi:10.1049/el.2013.1407
7. Lin, F. L., C. W. Chiu, and R. B. Wu, "Coplanar waveguide bandpass filter a ribbon-of-brick-wall design," IEEE Tran. Microw. Theory Tech., Vol. 43, No. 7, 1589-1596, 1995.
doi:10.1109/22.392919
8. Simons, R. N., Coplanar Waveguide Circuits, Components, and Systems, John Wiley & Sons, Inc., NJ, USA, 2001.
doi:10.1002/0471224758
9. Hong, J. S. and M. J. Lancaster, "Bandpass characteristics of new dual-mode microstrip square loop resonators," IET Electron. Lett., Vol. 31, No. 11, 891-892, 1995.
doi:10.1049/el:19950591
Submit
