A Tunable Trisection Bandpass Filter with Constant Fractional Bandwidth Based on Magnetic Coupling

Authors

  • Mingye Fu School of Information Science and Technology Southwest Jiaotong University, Chengdu, Sichuan, 610031, China
  • Qianyin Xiang School of Information Science and Technology Southwest Jiaotong University, Chengdu, Sichuan, 610031, China
  • Quanyuan Feng School of Information Science and Technology Southwest Jiaotong University, Chengdu, Sichuan, 610031, China

Keywords:

cross-coupling, trisection filter, tunable bandpass filter

Abstract

A tunable microstrip trisection bandpass filter with source-load coupling is proposed in this paper. Magnetic cross coupling structure based on varactor loaded open ring resonators is employed. No extra capacitor is used to adjust the coupling coefficients directly. Normalized coupling matrix M is used to calculate the frequency response, and formulas for computing the S parameters based on the resonator with unconventional phase performance are given. Coupling coefficients are investigated by computing the integral of the distributed voltage/current and it is proved that the coupling coefficients can meet the requirements of constant fractional bandwidth (CFBW). Due to the magnetic cross coupled trisection structure and the electrical source-load coupling, this tunable filter has three transmission zeros at finite frequency which can effectively improve the frequency selectivity. The measurement agrees well with the simulation. The center frequency can be tuned from 1097 MHz to 1936 MHz. In this tuning range, the insertion loss varies from 7.8 dB to 4 dB. A constant fractional bandwidth of about 5% is achieved.

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References

S. Nam, B. Lee, C. Kwak, and J. Lee, “A new class of k-band high-q frequency-tunable circular cavity filter,” IEEE Transactions on Microwave Theory and Techniques, vol. 66, no. 3, pp. 1228- 1237, 2018.

B. Yassini, M. Yu, and B. Keats, “A ka-band fully tunable cavity filter,” IEEE Transactions on Microwave Theory and Techniques, vol. 60, no. 12, pp. 4002-4012, 2012.

H. Aghayari, N. Komjani, and N. M. Garmjani, “A novel integrated corrugated waveguide bandpass filter,” Applied Computational Electromagnetics Society Journal, vol. 27, no. 1, pp. 67-73, Jan. 2012.

G. Zhang, J. P. Wang, H. Gu, and X. Xu, “60-ghz 3-d cavity bandpass filter for v-band gigabit wireless systems,” Applied Computational Electromagnetics Society Journal, vol. 29, no. 11, pp. 928-933, Nov. 2014.

S. Zhang, L. Zhu, and R. Weerasekera, “Synthesis of inline mixed coupled quasi-elliptic bandpass filters based on lamda/4 resonators,” IEEE Transactions on Microwave Theory and Techniques, vol. 63, no. 10, pp. 3487-3493, 2015.

A. Anand and X. Liu, “Reconfigurable planar capacitive coupling in substrate-integrated coaxialcavity filters,” IEEE Transactions on Microwave Theory and Techniques, vol. 64, no. 8, pp. 2548- 2560, 2016.

Y. C. Chiou and G. M. Rebeiz, “Tunable 1.55 - 2.1 ghz 4-pole elliptic bandpass filter with bandwidth control and > 50 db rejection for wireless systems,” IEEE Transactions on Microwave Theory and Techniques, vol. 61, no. 1, pp. 117- 124, 2013.

J. Hong, Microstrip Filters for RF Microwave Applications, 2nd Edition, NY:Wiley, New York, 2001.

T. Saito, S. Kodama, S. Ohshima, and A. Saito, “Design of high power handling filter using cascaded quadruplet superconducting bulk resonators,” IEEE Transactions on Applied Superconductivity, vol. 28, no. 4, pp. 1-4, 2018.

X. Jun, H. Wei, and C. Zhe, “A compact quarterwavelength stepped-impedance resonator bandpass filter with source-load coupling,” 2015 IEEE International Wireless Symposium (IWS 2015), pp. 1-4, Mar. 30-Apr. 1, 2015.

B. Liu, Z. Guo, X. Wei, Y. Ma, R. Zhao, K. Xing, and L. Wu, “Quad-band bpf based on slrs with inductive source, and load coupling,” Electronics Letters, vol. 53, no. 8, pp. 540-542, 2017.

N. M. Garmjani and N. Komjani, “Improved microstrip folded tri-section stepped impedance resonator bandpass filter using defected ground structure,” Applied Computational Electromagnetics Society Journal, vol. 25, no. 11, pp. 975-983, Nov. 2010.

D. Tian, Q. Feng, and Q. Xiang, “A constant absolute bandwidth tunable band-pass filter based on magnetic dominated mixed coupling, and source-load electric coupling,” Journal of Electromagnetic Waves, and Applications, vol. 30, no. 15, pp. 1953-1963, 2016.

D. Lu, N. S. Barker, and X. Tang, “A simple frequency-agile bandpass filter with predefined bandwidth and stopband using synchronously tuned dual-mode resonator,” IEEE Microwave and Wireless Components Letters, vol. 27, no. 11, pp. 983-985, 2017.

C. Schuster, R. Hu, A. Wiens, M. Maasch, R. Jakoby, and H. Maune, “Cross-coupled open-loop resonator bandpass filter with independently tunable center frequency and bandwidth,” 2018 IEEE Radio and Wireless Symposium (RWS), pp. 52-55, 15-18 Jan. 2018.

T. Yang and G. M. Rebeiz, “Tunable 1.25-2.1-ghz 4-pole bandpass filter with intrinsic transmission zero tuning,” IEEE Transactions on Microwave Theory and Techniques, vol. 63, no. 5, pp. 1569- 1578, 2015.

L. Zhou, S. Liu, J. Duan, and M. Xun, “A novel tunable combline bandpass filter based on external quality factor and internal coupling tunings,” Applied Computational Electromagnetics Society Journal, vol. 33, no. 6, pp. 690-696, Jun. 2018.

Z. Zhao, J. Chen, L. Yang, and K. Chen, “Threepole tunable filters with constant bandwidth using mixed combline, and split-ring resonators,” IEEE Microwave and Wireless Components Letters, vol. 24, no. 10, pp. 671-673, 2014.

M. Y. Fu, Q. Y. Xiang, D. Zhang, D. Y. Tian, and Q. Y. Feng, “A uhf 3rd order 5-bit digital tunable bandpass filter based on mixed coupled open ring resonators,” 2016 Progress in Electromagnetic Research Symposium (PIERS), pp. 3460-3463, 8- 11 Aug. 2016.

Y. C. Chiou and G. M. Rebeiz, “A tunable threepole 1.5-2.2-ghz bandpass filter with bandwidth, and transmission zero control,” IEEE Transactions on Microwave Theory and Techniques, vol. 59, no. 11, pp. 2872-2878, 2011.

Y. Chu-Chen, and C. Chi-Yang, “Microstrip cascade trisection filter,” IEEE Microwave and Guided Wave Letters, vol. 9, no. 7, pp. 271-273, 1999.

R. Kaushik, M. G. Madhan, and K. Jagadeeshvelan, “Design and development of microstrip trisection filter for dth applications,” 2014 International Conference on Communication and Network Technologies, pp. 8-10, 18-19 Dec. 2014.

Q. Xiang, Q. Feng, and X. Huang, “Tunable bandstop filter based on split ring resonators loaded coplanar waveguide,” Applied Computational Electromagnetics Society Journal, vol. 28, no. 7, pp. 591-596, Jul. 2013.

R. J. Cameron, “Advanced coupling matrix synthesis techniques for microwave filters,” IEEE Transactions on Microwave Theory and Techniques, vol. 51, no. 1, pp. 1-10, 2003.

R. J. Cameron, “General coupling matrix synthesis methods for chebyshev filtering functions,” IEEE Transactions on Microwave Theory and Techniques, vol. 47, no. 4, pp. 433- 442, 1999.

R. J. Cameron, “Advanced filter synthesis,” IEEE Microwave Magazine, vol. 12, no. 6, pp. 42-61, 2011.

A. C. Guyette, “Alternative architectures for narrowband varactor-tuned bandpass filters,” 2009 European Microwave Integrated Circuits Conference (EuMIC), pp. 475-478, 28-29 Sept. 2009.

M. Ohira and Z. Ma, “A parameter-extraction method for microwave transversal resonator array bandpass filters with direct source/load coupling,” IEEE Transactions on Microwave Theory and Techniques, vol. 61, no. 5, pp. 1801-1811, 2013.

T. Lin, K. K. W. Low, R. Gaddi, and G. M. Rebeiz, “High-linearity 5.3-7.0 ghz 3-pole tunable bandpass filter using commercial rf mems capacitors,” 2018 48th European Microwave Conference (EuMC), pp. 555-558, 23-27 Sept. 2018.

D. Jia, Q. Feng, X. Huang, and Q. Xiang, “Tunable microstrip bandpass filter with constant fractional bandwidth based on cascade triplet topology,” International Journal of Electronics, vol. 104, no. 10, pp. 1646-1657, 2017.

S. Wang, Q. Xiang, and Q. Feng, “A fourth order constant absolute bandwidth tunable bandpass filter with cross-coupling,” 2019 IEEE MTT-S International Wireless Symposium (IWS), pp. 1-3, 19-22 May 2019.

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Published

2019-12-01

How to Cite

[1]
Mingye Fu, Qianyin Xiang, and Quanyuan 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.

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