volume | PIER Journals

Abstract

A compact Ku-band bandpass filter (BPF) with wide pass-band, compact size and high selectively is presented. The presented BPF is composed of two quarter-wavelength resonators and a dual-mode resonator, resulting in a compact circuit size. The transmission zeros (TZs) located at the lower and upper stopband are achieved by the mixed electromagnetic (EM) coupling and dual-mode resonator, respectively, resulting in a high frequency selectively. The measured results show minimum in-band insertion loss, fractional bandwidth and variation of group delay to be 0.9 dB, 36.2% and 0.12 ns, respectively. Also, the stopband suppression is greater than 28 dB from 5 to 10.3 GHz and 30 dB from 19.5 to 29.5 GHz. The effective circuit size of the filter is 8.43×2.28 mm² (0.63 λg ×0.17 λg, where λg is the guide wavelength of 15.1 GHz.)

1. Li, R. and L. Zhu, "Compact UWB bandpass filter using stub-loaded multiple-mode resonator," IEEE Microw. Wireless Compon. Lett., Vol. 17, No. 1, 40-42, Jan. 2007.
doi:10.1109/LMWC.2006.887251 Google Scholar

2. Chen, C. F., C. Y. Lin, J. H. Weng, and K. L. Tsai, "Compact microstrip broadband filter using multimode stub-loaded resonator," Electron. Lett., Vol. 49, No. 8, 545-546, 2013.
doi:10.1049/el.2012.4437 Google Scholar

3. Ouyang, Z. A. and Q. X. Chu, "An improved wideband balanced filter using internal cross-coupling and 3/4λ stepped-impedance resonator," IEEE Microw. Wirel. Compon. Lett., Vol. 26, No. 3, 156-158, 2016.
doi:10.1109/LMWC.2016.2521176 Google Scholar

4. Shen, M. K., Z. H. Shao, C. J. You, and F. S. Ban, "Ku-band compact bandpass filter with wide upper stopband using multilayer LCP technology," Microw. Optical Tech. Lett., Vol. 57, No. 5, 1121-1125, 2015.
doi:10.1002/mop.29027 Google Scholar

5. Xiao, J. K., M. Zhu, Y. Li, and J. G. Ma, "Coplanar waveguide bandpass filters with separated electric and magnetic couplings," Electron. Lett., Vol. 52, No. 2, 122-124, 2016.
doi:10.1049/el.2015.3112 Google Scholar

6. Wang, H. and Q. X. Chu, "An inline coaxial quasi-elliptic filter with controllable mixed electric and magnetic coupling," IEEE Trans. Microw. Theory Tech., Vol. 57, No. 3, 667-673, 2009.
doi:10.1109/TMTT.2009.2013290 Google Scholar

7. Xiao, J.-K., M. Zhu, Y. Li, T. Li, and J.-G. Ma, "High selective microstrip bandpass filter and diplexer with mixed electromagnetic coupling," IEEE Microw. Wirel. Compon. Lett., Vol. 25, No. 12, 781-783, 2015.
doi:10.1109/LMWC.2015.2495194 Google Scholar

8. Yuan, S. L., X. B. Wei, G. T. Yue, and M. X. Zhang, "Cascaded fourth-order mixed-coupled bandpass filter with good frequency selectivity," International Workshop on Microwave and Millimeter Wave Circuits and System Technology, 229-232, 2013.
doi:10.1109/MMWCST.2013.6814615 Google Scholar

9. Xu, J., "Compact tunable wideband bandpass filter using mixed coupling lumped dual-mode resonator," Journal of Electromagnetic Waves and Applications, Vol. 30, No. 6, 714-720, 2016.
doi:10.1080/09205071.2016.1145074 Google Scholar

10. Xu, J., "Compact quasi-elliptic response wideband bandpass filter with four transmission zeros," IEEE Microw. Wirel. Compon. Lett., Vol. 25, No. 3, 169-171, 2015.
doi:10.1109/LMWC.2015.2390571 Google Scholar

11. Tang, S. C., J. T. Kuo, and S. J. Chung, "Bandwidth and transmission zero control for compact dual-mode resonator filter by extraction of EM coupling," Asia Pacific Microwave Conference Proceedings (APMC), 661-663, 2012. Google Scholar

12. Xu, H. X., G. M.Wang, and C. X. Zhang, "Fractal-shaped UWB bandpass filter based on composite right/left handed transmission line," Electron. Lett., Vol. 46, No. 4, 285-286, 2010.
doi:10.1049/el.2010.3139 Google Scholar

13. Xu, H. X., G. M. Wang, Z. M. Xu, X. Chen, Z. W. Yu, and L. Geng, "Dual-shunt branch circuit and harmonic suppressed device application," Applied Physics A, Vol. 108, No. 2, 497-502, 2012.
doi:10.1007/s00339-012-6923-5 Google Scholar

14. Xu, H. X., G. M. Wang, and J. G. Liang, "Novel composite right/left handed transmission lines using fractal geometry and compact microwave devices application," Radio Sci., Vol. 46, RS5008, 2011. Google Scholar

15. Xu, H. X., G. M. Wang, C. X. Zhang, and X. Wang, "Characterization of composite right/left handed transmission line," Electron. Lett., Vol. 47, No. 18, 1030-1032, 2011.
doi:10.1049/el.2010.3707 Google Scholar

16. Chu, Q. X. and H. Wang, "A compact open-loop filter with mixed electric and magnetic coupling," IEEE Trans. Microw. Theory Tech., Vol. 56, No. 2, 431-439, 2008.
doi:10.1109/TMTT.2007.914642 Google Scholar

17. Cai, P., Z. W. Ma, X. H. Guan, G. X. Zheng, A. Tetsuo, and H. Gen, "A compact and low-loss sub-millimeter-wave ultra-wideband bandpass filter," Microw. Optical Tech. Lett., Vol. 49, No. 2, 481-484, 2007.
doi:10.1002/mop.22149 Google Scholar

18. Zhu, W. S., J. R. Zhang, and M. X. Yu, "A novel Ku-band microstrip triple-mode filter using stub-loaded resonator," International Conf. Electronics, Communications and Control (ICECC), 1847-1849, 2011. Google Scholar

19. Avinash, K. G. and I. S. Rao, "Compact dual-mode microstrip bandpass filters with transmission zeros using modified star shaped resonator," Progress In Electromagnetics Research C, Vol. 71, 177-187, 2017.
doi:10.2528/PIERC16122801 Google Scholar

20. Maharjan, R. K., B. Shrestha, and N. Y. Kim, "Compact microstrip square open-loop bandpass filter using open stub," Electron. Lett., Vol. 48, No. 6, 333-334, 2012.
doi:10.1049/el.2012.0143 Google Scholar

21. Ge, C., X. W. Zhu, W. C. Zhu, and X. Jiang, "Synthesis design of box-section bandpass filter with hybrid and dual-mode resonators," IEEE Microw. Wirel. Compon. Lett., Vol. 24, No. 12, 836-838, 2014.
doi:10.1109/LMWC.2014.2360431 Google Scholar

22. Ma, K., K. C. B. Liang, R.M. Jayasuriya, and K. S. Yeo, "A wideband and high rejection multimode bandpass filter using stub perturbation," IEEE Microw. Wirel. Compon. Lett., Vol. 19, No. 1, 24-26, 2009.
doi:10.1109/LMWC.2008.2008554 Google Scholar

Mr. Mengkui Shen

Dr. Xianqi Lin

Dr. Jing Ai

Dr. Cong Tang

Professor William Joines