Design and Application of Coupled Line Cross-Shaped Resonator in Band-pass Filter
Keywords:
Band-pass filter, coupled line crossshaped resonator, transmission pole, transmission zeroAbstract
A coupled line cross-shaped resonator (CLCSR) is proposed, which consists of four parallel coupled lines. By using even- and odd-mode approach, this resonator is characterized and designed to build up a wide band-pass filter. There are three transmission poles in the pass-band and two transmission zeros out of the pass-band. The positions of the transmission zeros are fixed. The transmission poles are determined and adjusted by the parameters: z1, z2, k1, and k2. Then two coupled line cross-shaped resonators are cascaded to realize a wide band-pass filter. The sharper selectivity and better performance can be obtained by cascading two CLCSRs. Good S-parameters are achieved as demonstrated in both simulated and measured results.
Downloads
References
H. Wang, G. Yang, and W. Kang, “Application of cross-shaped resonator to the ultra wideband bandpass filter design,” IEEE Microwave and Wireless Components Letters, vol. 17, no. 12, pp. 667-669, Dec. 2011.
T. H. Duong and I. S. Kim, “Steeply sloped UWB band-pass filter based on stub-loaded resonator,” IEEE Microwave and Wireless Components Letters, vol. 20, no. 8, pp. 441-443, Aug. 2010.
D. Chen, H. Z. Bu, L. Zhu, et al., “A differentialmode wideband band-pass filter on slot-line multimode resonator with controllable bandwidth,” IEEE Microwave and Wireless Components Letters, vol. 25, no. 1, pp. 28-30, Jan. 2015.
T. Cheng and K. W. Tam, “A wideband band-pass filter with reconfigurable bandwidth based on cross-shaped resonator,” IEEE Microwave and Wireless Components Letters, vol. 27, no. 10, pp. 909-911, Oct. 2017.
A. Zakharov and M. Ilchenko, “Trisection microstrip delay line filter with mixed cross-coupling,” IEEE Microwave and Wireless Components Letters, vol. 27, no. 12, pp. 1083-1085, Dec. 2017.
X. K. Bi, C. Teng, P. Cheong, et al., “Wideband band-pass filters with reconfigurable bandwidth and fixed notch bands based on terminated crossshaped resonator,” IET Microwaves, Antennas & Propagation, vol. 13 no. 6, pp. 796-803, May 2019.
Z. C. Guo, L. Zhu, and S. W. Wong, “A quantitative approach for direct synthesis of bandpass filters composed of transversal resonators,” IEEE Transactions on Circuits and Systems—II: Express Briefs, vol. 66, no. 4, pp.577-581, Apr. 2019.
D. Chen, H. Z. Bu, L. Zhu, et al., “A differentialmode wideband band-pass filter on slot-line multimode resonator with controllable bandwidth,” IEEE Microwave and Wireless Components Letters, vol. 25, no. 1, pp. 28-30, Jan. 2015.
L. X. Zhou, Y. Z. Yin, W. Hu, et al., “Compact band-pass filter with sharp out-of-band rejection and its application,” ACES Journal, vol. 32, no. 3, pp. 249-255, Mar. 2017.
M. Y. Fu, Q. Y. Xiang, and Q. Y. Feng, “A tunable trisection bandpass filter with constant fractional bandwidth based on magnetic coupling,” ACES Journal, vol. 34, no. 12, pp. 1888-1896, Dec. 2019.
D. Y. Tian, Q. Y. Feng, and Q. Y. Xiang, “Design of high order cross-coupled constant absolute bandwidth frequency-agile bandpass filters,” ACES Journal, vol. 34, no. 9, pp. 1373-1378, Sep. 2019.
I. Z. George and A. K. Johnson, “Coupled transmission line networks in an inhomogeneous dielectric medium,” IEEE Transactions on Microwave Theory and Techniques, vol. 17, no. 10, pp. 753~759, Oct. 1969.
