A compact ultra-wideband (UWB) bandpass filter (BPF) with dual notch bands is presented using a tri-layer structure. In the design of UWB BPFs, it is desired to have a uniform 3.1 GHz to 10.6 GHz full-band transmission response. Dual notch bands are generated to filter out the interferences caused by signals transmitted from WLAN and/or WiMAX systems at 5.8 GHz and 3.5 GHz, respectively. The sharp rejection of WiMAX signals is achieved by adding meander open-loop resonators on the middle layer. Another rejection of WLAN signals is introduced by adding a C-shaped resonator on the bottom layer. The proposed filter is not only realized theoretically but also verified by a full-wave electromagnetic simulation. The designed tri-layer UWB BPF with dual notch bands was fabricated by two FR4 printed circuit boards with the permittivity of 4.4 and the thickness of 0.8 mm. The total area is 11 mm×10.5 mm.
2. Chen, H. and Y.-X. Zhang, "A novel and compact UWB bandpass filter using microstrip fork-form resonators," Progress In Electromagnetics Research, Vol. 77, 273-280, 2007.
doi:10.1163/156939308784150317
3. Gao, S. S., X. S. Yang, J. P. Wang, S. Q. Xiao, and B. Z. Wang, "Compact ultra-wideband (UWB) bandpass filter using modified stepped impedance resonator," Journal of Electromagnetic Waves and Applications, Vol. 22, No. 4, 541-548, 2008.
doi:10.1163/156939308787537982
4. Gong, J.-Q. and Q.-X. Chu, "SCRLH TL based UWB bandpass filter with widened upper stopband," Journal of Electromagnetic Waves and Applications, Vol. 22, No. 14-15, 1985-1992, 2008.
doi:10.2528/PIERC09112102
5. Qiang, L., Y.-J. Zhao, Q. Sun, W. Zhao, and B. Liu, "A compact UWB bandpass filter based on complementary split-ring resonators," Progress In Electromagnetics Research C, Vol. 11, 237-243, 2009.
6. Packiaraj, D., K. J. Vinoy, and A. T. Kalghatgi, "Analysis and design of two layered ultra wide band filter," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 8-9, 1235-1243, 2009.
doi:10.1163/156939309787604508
7. Razalli, M. S., A. Ismail, M. A. Mahdi, and M. N. Hamidon, "Via-less UWB filter using patched microstrip stubs," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 2-3, 377-388, 2009.
doi:10.1163/156939309789566950
8. Tang, I.-T., D.-B. Lin, C.-M. Li, and M.-Y. Chiu, "Compact pentagon ultra-wideband band-pass filter with good out-of-band performance," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 13, 1695-1706, 2009.
doi:10.2528/PIERL08020902
9. NaghshvarianJahromi, M. and M. Tayarani, "Miniature planar UWB bandpass filters with circular slots in ground," Progress In Electromagnetics Research Letters, Vol. 3, 87-93, 2008.
doi:10.2528/PIERL08121309
10. An, J., G.-M. Wang, W.-D. Zeng, and L.-X. Ma, "UWB filter using defected ground structure of von koch fractal shape slot," Progress In Electromagnetics Research Letters, Vol. 6, 61-66, 2009.
11. Wei, F., L. Chen, X.-W. Shi, X. H. Wang, and Q. Huang, "Compact UWB bandpass filter with notched band," Progress In Electromagnetics Research C, Vol. 4, 121-128, 2008.
doi:10.1109/LMWC.2009.2024828
12. Hao, Z.-C. and J.-S. Hong, "Compact UWB filter with double notch-bands using multilayer LCP technology," IEEE Microwave Compon. Lett., Vol. 19, No. 8, 500-502, Aug. 2009.
doi:10.1109/LMWC.2010.2040212
13. Luo, X., J.-G. Ma, K. Ma, and K.-S. Yeo, "Compact UWB bandpass filter with ultra narrow notched band," IEEE Microwave Compon. Lett., Vol. 20, No. 3, 145-147, Mar. 2010.
14. Li, K., K. Daisuke, and T. Matsui, "UWB bandpass filters with multi notched bands," 36th European Microwave Conference, 591-594, 2006.
doi:10.1109/LMWC.2010.2040213
15. Lin, W.-J., J.-Y. Li, L.-S. Chen, D.-B. Lin, and M.-P. Houng, "Investigation in open circuited metal lines embedded in defected ground structure and its applications to UWB filters," IEEE Microwave Compon. Lett., Vol. 20, No. 3, 148-150, Mar. 2010.
doi:10.1109/LMWC.2008.916781
16. Yang, G.-M., R. Jin, C. Vittoria, V. G. Harris, and N. X. Sun, "Small ultra-wideband (UWB) bandpass filter with notched band," IEEE Microwave Compon. Lett., Vol. 18, No. 3, 176-178, 2008.
doi:10.1109/LAWP.2008.920964
17. Ali, A. and Z. Hu, "Metamaterial resonator based wave propagation notch for ultrawideband filter applications," IEEE Antennas Wireless Propag. Lett., Vol. 7, 210-212, Sep. 2008.
doi:10.1002/mop.24556
18. Weng, M.-H., H. Kuan, W.-L. Chen, C.-S. Ye, and Y.-K. Su, "Design of a stopband-improved UWB filter using a pair of shunt and embedded open stubs," Microwave and Optical Technology Letters, Vol. 51, No. 9, 2121-2124, Sep. 2009.
doi:10.1163/156939308787543921
19. Lee, C.-H., I.-C. Wang, and L.-Y. Chen, "MMR-based band-notched UWB bandpass filter design," Journal of Electromagnetic Waves and Applications, Vol. 22, No. 17-18, 2407-2415, 2008.
doi:10.2528/PIERL09022501
20. Hsiao, P.-Y. and R.-M. Weng, "Compact open-loop UWB filter with notched band," Progress In Electromagnetics Research Letters, Vol. 7, 149-159, 2009.
doi:10.1002/mop.25153
21. Hsiao, P.-Y. and R.-M. Weng, "C-shaped ultra-wideband bandpass filter with WLAN notch band," Microwave and Optical Technology Letters, Vol. 52, No. 5, 1215-1218, May 2010.
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