A compact square dc-block bandpass filter with slots is presented. The proposed dc-block bandpass filter using square shapes produces compact size and improved performance as compared to the conventional dc-block bandpass filter using cymbal shapes. Two filters with the same dimensions provide different center frequencies respectively. In other words, the center frequency of the square bandpass filter is lower than that of the cymbal bandpass filter. The center frequency and transmission zeros can also be controlled by the slots of the square shape in the proposed square bandpass filter. The proposed square bandpass filter has an insertion loss of better than 2 dB and a return loss better than 10 dB at center frequency of 7.2 GHz. The proposed square dc-block bandpass filter is optimized by electromagnetic simulator IE3D.
2. Xiao, J.-K., Q.-X. Chu, and S. Zhang, "Novel microstrip triangular resonator bandpass filter with transmission zeros and wide bands using fractal-shaped defection," Progress In Electromagnetics Research, Vol. 77, 343-356, 2007.
doi:10.2528/PIER07081901
3. Strassner, B. and K. Chang, "New wide-band DC-block cymbal bandpass filter," IEEE Trans. on Microwave Theory and Techniques, Vol. 50, 1431-1432, 2002.
doi:10.1109/22.999159
4. Zhao , L.-P., X.-W. Dai, Z.-X. Chen, and C.-H. Liang, "Novel design of dual-mode dual-band bandpass filter with triangular resonators," Progress In Electromagnetics Research, Vol. 77, 417-424, 2007.
doi:10.2528/PIER07090501
5. Xiao, J.-K., "Triangular resonator bandpass filter with tunable operation," Progress In Electromagnetics Research Letters, Vol. 2, 167-176, 2008.
doi:10.2528/PIERL08010606
6. Liu, H., Z. Cheng, and L. Sun, "Low-loss triangular-patch dual-mode bandpass filter with slotted input/output," Microwave and Optical Technology Letters, Vol. 49, No. 1, 147-149, 2006.
doi:10.1002/mop.22072
7. Alhawari, A. R. H. and A. Ismail, "Compact wideband bandpass filter using single corners-cut isosceles triangular patch resonator," Progress In Electromagnetics Research C, Vol. 14, 227-237, 2010.
doi:10.2528/PIERC10060102
8. Xiao, J.-K., X.-P. Zu, X. Li, and L. Tian, "Right-angled triangular patch resonator and filter with fractal hole," Progress In Electromagnetics Research B, Vol. 40, 141-158, 2012.
9. Liu, H. W., Z. Q. Cheng, and L. L. Sun, "Dual-mode triangular-patch bandpass filter using spur-lines," Electron. Lett., Vol. 42, 762-763, 2006.
doi:10.1049/el:20060898
10. Wang, C. J. and Z. C. Ker, "Miniaturized dual-mode triangular patch filter with inverted V-shaped slot," Microwave and Optical Technology Letters, Vol. 48, No. 10, 1969-1974, 2006.
doi:10.1002/mop.21824
11. Kelly, J. R., R. D. Seager, and T. Wong, "Lumped element equivalent circuit for the cymbal resonator bandpass filter," Microwave and Optical Technology Letters, Vol. 50, No. 9, 2381-2384, 2008.
doi:10.1002/mop.23671
Submit
