volume | PIER Journals

Abstract

A new approach to design a microstrip ultra-wideband (UWB) bandpass filter (BPF) with quad sharply notched bands and good selectivity is proposed using quad parallel defected microstrip structures (PDMSs). The initial UWB BPF comprises interdigital coupled lines and an E-shaped multiple-mode resonator (EMMR) to achieve two transmission zeros on both sides of the passband thus to improve skirt selectivity. Then, four PDMSs are introduced, which have the properties of achieving four band-notched characteristics and provide high degree of adjusting freedom. To validate the design theory, a new microstrip UWB BPF with four notched bands respectively centered at 5.3, 5.9, 6.4, and 7.4 GHz is designed and fabricated. Both simulation and experimental results are provided with good agreement. The designed methodology is very efficient and useful for filter synthesis though the design principle is simple.

1. Zhu, L., S. Sun, and W. Menzel, "Ultra-wideband (UWB) bandpass filters using multiple-mode resonator," IEEE Microw. Wirel. Compon. Lett., Vol. 15, No. 11, 796-798, 2005.
doi:10.1109/LMWC.2005.859011 Google Scholar

2. Assaf, M., A. Malki, and A. A. Sarhan, "Synthesis and design of MMR-based ultrawideband (UWB) band pass filter (BPF) in suspended stripline (SSL) technology," Progress In Electromagnetics Research Letters, Vol. 84, 123-130, 2019.
doi:10.2528/PIERL19031602 Google Scholar

3. Comez-Garcia, R. and J. I. Alonso, "Systematic method for the exact synthesis of ultra-wideband filtering responses using high-pass and low-pass sections," IEEE Trans. Microw. Theory Tech., Vol. 54, No. 10, 3751-3764, 2006.
doi:10.1109/TMTT.2006.882883 Google Scholar

4. Liu, B. W., Y. Z. Yin, Y. Yang, S. H. Jing, and A. F. Sun, "Compact UWB bandpass filter with two notched bands based on electromagnetic bandgap structures," Electron. Lett., Vol. 47, No. 13, 757-758, 2011.
doi:10.1049/el.2011.1281 Google Scholar

5. Mokhtarani, A. and A. Ahmadi, "A compact UWB band pass filter using simple defected ground structures," Progress In Electromagnetics Research Letters, Vol. 79, 17-24, 2018.
doi:10.2528/PIERL17112001 Google Scholar

6. Shaman, H. and J. S. Hong, "Asymmetric parallel-coupled lines for notch implementation in UWB filter," IEEE Microw. Wirel. Compon. Lett., Vol. 17, No. 7, 516-518, 2007.
doi:10.1109/LMWC.2007.899314 Google Scholar

7. Song, K. and Q. Xue, "Compact ultra-wideband (UWB) bandpass filters with multiple notched bands," IEEE Microw. Wirel. Compon. Lett., Vol. 20, No. 8, 447-449, 2010.
doi:10.1109/LMWC.2010.2050303 Google Scholar

8. Wei, F., Q. Y. Wu, X. W. Shi, and L. Chen, "Compact UWB BPF with triple-notched bands based on stub loaded resonator," Electron. Lett., Vol. 49, No. 2, 124-126, 2013.
doi:10.1049/el.2012.2885 Google Scholar

9. Tang, C. and N. Yang, "Design of compact microstrip UWB bandpass filter with triple-notched bands," Progress In Electromagnetics Research Letters, Vol. 58, 9-16, 2016.
doi:10.2528/PIERL15072904 Google Scholar

10. Wang, J., J. Zhao, and J. L. Li, "Compact UWB bandpass filter with triple notched bands using parallel U-shaped defected microstrip structure," Electronics Letters, Vol. 50, No. 2, 89-91, 2014.
doi:10.1049/el.2013.3077 Google Scholar

Dr. Fengjing Liu

Dr. Mao Qun