OVERVIEW OF BALANCED MICROWAVE FILTER STRUCTURES AND THEIR KEY FEATURES
DOI:
https://doi.org/10.20535/2411-2976.12026.79-91Keywords:
balanced filter, common-mode rejection, differential-mode, substrate integrated waveguide, microstrip, metamaterial, reflectionless filterAbstract
Background. Balanced microwave filters are critical components in modern communication systems, offering superior common-mode noise rejection and reduced electromagnetic interference compared to single-ended counterparts. The growing demand for high-performance differential signal processing in contemporary wireless and wired communication channels necessitates a systematic understanding of available balanced filter topologies and their design trade-offs.
Objective. The paper aims to provide a comprehensive overview of balanced microwave filter architectures, covering microstrip and substrate integrated waveguide (SIW) implementations, and to establish quantitative performance benchmarks across published designs.
Methods. The study systematically examines differential-mode signal processing principles and analyses various structural configurations, including coupled resonator designs and metamaterial-inspired topologies. Key parameters – common-mode rejection ratio (CMRR), differential-mode insertion loss, fractional bandwidth, and stopband characteristics – are evaluated across a representative set of published implementations. The evolution from traditional filters to reflectionless is traced.
Results. The analysis reveals significant advances in miniaturisation techniques, wideband common-mode suppression, and absorptive filtering approaches. The integration of metamaterial concepts enables enhanced CMRR and compact form factors. Quantitative comparisons demonstrate the trade-offs between filter size, CMRR, insertion loss, and operational bandwidth.
Conclusions. This overview establishes a structured foundation for understanding the diverse landscape of balanced filter architectures and their applications in differential communication systems.
References
D. E. Bockelman and W. R. Eisenstadt, "Combined differential and common-mode scattering parameters: Theory and simulation," IEEE Trans. Microw. Theory Techn., vol. 43, no. 7, pp. 1530–1539, Jul. 1995.
C.-H. Wu, C.-H. Wang, and C. H. Chen, "Novel balanced coupled-line bandpass filters with common-mode noise suppression," IEEE Trans. Microw. Theory Techn., vol. 55, no. 2, pp. 287–295, Feb. 2007.
W. Feng, W. Che, and Q. Xue, "The proper balance: Overview of microstrip wideband balance circuits with wideband common mode suppression," IEEE Microw. Mag., vol. 16, no. 5, pp. 55–68, Jun. 2015.
C. Caloz and T. Itoh, Electromagnetic Metamaterials: Transmission Line Theory and Microwave Applications. John Wiley & Sons, 2006.
R. Gómez-García, L. Yang, J.-M. Muñoz-Ferreras, and D. Psychogiou, "Lossy signal-interference techniques for reflectionless microwave bandpass filtering components for advanced RF front ends," IEEE Microw. Mag., vol. 21, no. 12, pp. 68–86, Dec. 2020.
D. Deslandes and K. Wu, "Integrated microstrip and rectangular waveguide in planar form," IEEE Microw. Wireless Compon. Lett., vol. 11, no. 2, pp. 68–70, Feb. 2001.
W. R. Eisenstadt, B. Stengel, and B. M. Thompson, Microwave Differential Circuit Design Using Mixed-Mode S-Parameters. Norwood, MA: Artech House, 2006.
C.-H. Wu, C.-H. Wang, and C. H. Chen, "Stopband-extended balanced bandpass filter using coupled stepped-impedance resonators," IEEE Microw. Wireless Compon. Lett., vol. 17, no. 7, pp. 507–509, Jul. 2007.
W. Feng, B. Pan, H. Zhu, X. Y. Zhou, W. Che, and Q. Xue, "High performance balanced bandpass filters with wideband common mode suppression," IEEE Trans. Circuits Syst. II, Exp. Briefs, vol. 68, no. 6, pp. 1897–1901, Jun. 2021.
J.-S. Hong and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications. John Wiley & Sons, 2001.
R. Gómez-García, J.-M. Muñoz-Ferreras, W. Feng, and D. Psychogiou, "Balanced symmetrical quasi-reflectionless single- and dual-band bandpass planar filters," IEEE Microw. Wireless Compon. Lett., vol. 28, no. 9, pp. 798–800, Sep. 2018.
X. Zhao, F. Wei, L. Yang, and R. Gómez-García, "Two-layer-magic-T-based bandpass, quasi-bandstop, and dual-passband balanced filters with differential-/common-mode reflectionless behavior," IEEE Trans. Microw. Theory Techn., vol. 72, no. 4, pp. 2267–2282, Apr. 2024.
M. Sans et al., "Compact wideband balanced bandpass filters with very broad common-mode and differential-mode stopbands," IEEE Trans. Microw. Theory Techn., vol. 66, no. 2, pp. 737–750, Feb. 2018.
A.-S. Liu, T.-Y. Huang, and R.-B. Wu, "A dual-wideband bandpass filter based on stub-loaded resonators," IEEE Microw. Wireless Compon. Lett., vol. 18, no. 5, pp. 315–317, May 2008.
R. Gómez-García, R. Loeches-Sánchez, D. Psychogiou, and D. Peroulis, "Multi-stub-loaded differential-mode planar multiband bandpass filters," IEEE Trans. Circuits Syst. II, Exp. Briefs, vol. 65, no. 2, pp. 271–275, Feb. 2018.
F. Wei et al., "Compact balanced dual-band BPFs based on short and open stub loaded resonators with wide common-mode suppression," IEEE Trans. Circuits Syst. II, Exp. Briefs, vol. 67, no. 12, pp. 3043–3047, Dec. 2020.
M. Makimoto and S. Yamashita, "Bandpass filters using parallel coupled stripline stepped impedance resonators," IEEE Trans. Microw. Theory Techn., vol. 28, no. 12, pp. 1413–1417, Dec. 1980.
L.-H. Hsieh and K. Chang, "Compact, low insertion-loss, sharp-rejection, and wide-band microstrip bandpass filters," IEEE Trans. Microw. Theory Techn., vol. 51, no. 4, pp. 1241–1246, Apr. 2003.
Y. Zhang, Y. Wu, W. Wang, and J. Yan, "High-performance common- and differential-mode reflectionless balanced band-pass filter using coupled ring resonator," IEEE Trans. Circuits Syst. II, Exp. Briefs, vol. 69, no. 3, pp. 974–978, Mar. 2022.
Z. Zhang, G. Zhang, Z. Liu, W. Tang, and J. Yang, "Compact balanced bandpass filter based on equilateral triangular patch resonator," IEEE Trans. Circuits Syst. II, Exp. Briefs, vol. 69, no. 1, pp. 90–93, Jan. 2022.
P. Chu, W. Hong, K. Wang, H.-J. Tang, Z.-C. Hao, J.-X. Chen, and K. Wu, "Balanced substrate integrated waveguide filter," IEEE Trans. Microw. Theory Techn., vol. 62, no. 4, pp. 824–831, Apr. 2014.
X.-P. Chen and K. Wu, "Substrate integrated waveguide filter: Basic design rules and fundamental structure features," IEEE Microw. Mag., vol. 15, no. 5, pp. 108–116, Jul. 2014.
Z. Shen, K. Xu, G. M. Mbongo, J. Shi, and Y. Yang, "Compact balanced substrate integrated waveguide filter with low insertion loss," IEEE Access, vol. 7, pp. 126111–126115, 2019.
Q. Liu, Q. Liu, J. Li, J. Wei, and D. Zhang, "Balanced multiple-layer dual-mode substrate integrated waveguide filters with controllable finite-transmission zeros," IET Microw. Antennas Propag., vol. 15, no. 15, pp. 1982–1994, Dec. 2021.
C. D. K. Mutepfe and V. M. Srivastava, "Design and analysis of compact 5th mode balanced substrate integrated waveguide band-pass filter for 39 GHz," Int. J. Commun. Antenna Propag. (IRECAP), vol. 11, no. 6, pp. 401–407, 2021.
Y. Huang, Z. Shao, and L. Liu, "A substrate integrated waveguide bandpass filter using novel defected ground structure shape," IEEE Microw. Wireless Compon. Lett., vol. 25, no. 7, pp. 453–455, Jul. 2015.
J. Zhu, H. Deng, Y. Han, S. Xing, and W. Han, "Compact triple-mode HMSIW balanced passband filter with intrinsic common-mode suppression," Microw. Opt. Technol. Lett., vol. 63, no. 7, pp. 1803–1806, Jul. 2021.
H.-W. Deng, Y.-K. Han, L. Sun, J.-M. Zhu, and S.-B. Xing, "Multilayer dual-mode balanced SIW filter utilizing PEC–PMC characteristic for common-mode suppression," IEEE Microw. Wireless Compon. Lett., vol. 30, no. 9, pp. 865–868, Sep. 2020.
P. Li, H. Chu, D. Zhao, and R.-S. Chen, "Compact dual-band balanced SIW bandpass filter with improved common-mode suppression," IEEE Microw. Wireless Compon. Lett., vol. 27, no. 4, pp. 347–349, Apr. 2017.
O. Glubokov, O. Zhivkov, V. Stepanenko, M. Ilchenko and J. Oberhammer, "On Modelling of Balanced Filters," 2024 IEEE International Microwave Filter Workshop (IMFW), Cocoa Beach, FL, USA, 2024, pp. 183-186, doi: 10.1109/IMFW59690.2024.10477116.
G. V. Eleftheriades, A. K. Iyer, and P. C. Kremer, "Planar negative refractive index media using periodically L-C loaded transmission lines," IEEE Trans. Microw. Theory Techn., vol. 50, no. 12, pp. 2702–2712, Dec. 2002.
Y. Song, H. Liu, W. Zhao, P. Wen, and Z. Wang, "Compact balanced dual-band bandpass filter with high common-mode suppression using planar via-free CRLH resonator," IEEE Microw. Wireless Compon. Lett., vol. 28, no. 11, pp. 996–998, Nov. 2018.
F. Martin et al., "Miniaturized coplanar waveguide stop band filters based on multiple tuned split ring resonators," IEEE Microw. Wireless Compon. Lett., vol. 13, no. 12, pp. 511–513, Dec. 2003.
F.-R. Yang, K.-P. Ma, Y. Qian, and T. Itoh, "A uniplanar compact photonic-bandgap (UC-PBG) structure and its applications for microwave circuits," IEEE Trans. Microw. Theory Techn., vol. 47, no. 8, pp. 1509–1514, Aug. 1999.
X. Chen, T. Yang, and P.-L. Chi, "Arbitrary-order balanced filter with reflectionless characteristics for both common- and differential-mode signals," IEEE Microw. Wireless Compon. Lett., vol. 31, no. 6, pp. 553–556, Jun. 2021.
D. J. Simpson and D. Psychogiou, "Coupling matrix-based design of fully reconfigurable differential/balanced RF filters," IEEE Microw. Wireless Compon. Lett., vol. 28, no. 10, pp. 888–890, Oct. 2018.
J. Jin et al., "Deep neural network technique for high-dimensional microwave modeling and applications to parameter extraction of microwave filters," IEEE Trans. Microw. Theory Techn., vol. 67, no. 10, pp. 4140–4155, Oct. 2019.
F. Feng et al., "Artificial neural networks for microwave computer-aided design: The state of the art," IEEE Trans. Microw. Theory Techn., vol. 70, no. 11, pp. 4597–4619, Nov. 2022.
Y. Yu et al., "State-of-the-art: AI-assisted surrogate modeling and optimization for microwave filters," IEEE Trans. Microw. Theory Techn., vol. 70, no. 11, pp. 4635–4651, Nov. 2022.
J. Shi and Q. Xue, "Balanced bandpass filters using center-loaded half-wavelength resonators," IEEE Trans. Microw. Theory Techn., vol. 58, no. 4, pp. 970–977, Apr. 2010.
F. Wei, C. Y. Zhang, C. Zeng, and X. W. Shi, "A reconfigurable balanced dual-band bandpass filter with constant absolute bandwidth and high selectivity," IEEE Trans. Microw. Theory Techn., vol. 69, no. 9, pp. 4029–4040, Sep. 2021.
D.-S. Wu, Y. C. Li, Q. Xue, and B.-J. Hu, "Balanced dielectric resonator filters with multiple reconfigurable passbands," IEEE Trans. Microw. Theory Techn., vol. 70, no. 1, pp. 180–189, Jan. 2022.
P.-L. Chi, Y.-M. Chen, and T. Yang, "Single-layer dual-band balanced substrate-integrated waveguide filtering power divider for 5G millimeter-wave applications," IEEE Microw. Wireless Compon. Lett., vol. 30, no. 6, pp. 585–588, Jun. 2020.
F. Wei et al., "A balanced-to-balanced in-phase filtering power divider with high selectivity and isolation," IEEE Trans. Microw. Theory Techn., vol. 67, no. 2, pp. 683–694, Feb. 2019.
H.-W. Deng, L. Sun, F. Liu, Y.-F. Xue, and T. Xu, "Compact tunable balanced bandpass filter with constant bandwidth based on magnetically coupled resonators," IEEE Microw. Wireless Compon. Lett., vol. 29, no. 4, pp. 264–266, Apr. 2019.
L. Yang and R. Gómez-García, "High-order quasi-elliptic-type single-ended and balanced wideband bandpass filters using microstrip-to-microstrip vertical transitions," IEEE Trans. Circuits Syst. II, Exp. Briefs, vol. 70, no. 4, pp. 1425–1429, Apr. 2023
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