High Performance Balanced Bandpass Filters With Wideband Common Mode Suppression

Two compact and high selectivity balanced bandpass filters with excellent common mode rejection are designed in this brief. Compared with the half-wavelength microstrip transmission line, 180° phase shift is realized by two small swap structures, which are composed by double-sided parallel-strip line (DSPSL), and this way can easily realize a wideband common mode rejection with compact circuit size. Two out-of-band transmission zeros are introduced by the dual-mode ring resonator in the first proposed structure; thus, high selectivity can be achieved. In the second filter, shorted/open coupled microstrip lines are added between the dual-mode ring resonator and 180° swap structure, two additional transmission zeros can be achieved. Finally, two prototypes center at 2.2 GHz are fabricated, and the measured 3-dB bandwidths for the differential mode are 23.6% and 11.8%, respectively.

[1]  Ferran Martin,et al.  Design of differential-mode wideband bandpass filters with wide stop band and common-mode suppression by means of multisection mirrored stepped impedance resonators (SIRs) , 2015, 2015 IEEE MTT-S International Microwave Symposium.

[2]  Wenquan Che,et al.  Novel Wideband Differential Bandpass Filters Based on T-Shaped Structure , 2012, IEEE Transactions on Microwave Theory and Techniques.

[3]  T. B. Lim,et al.  A Differential-Mode Wideband Bandpass Filter on Microstrip Line for UWB Application , 2009, IEEE Microwave and Wireless Components Letters.

[4]  Ya-Ming Wang,et al.  Compact Differential Wideband Bandpass Filters With Wide Common-Mode Suppression , 2014, IEEE Microwave and Wireless Components Letters.

[5]  Vicente E. Boria,et al.  Automated design of balanced wideband bandpass filters based on mirrored stepped impedance resonators (SIRs) and interdigital capacitors , 2016, International Journal of Microwave and Wireless Technologies.

[6]  Vicente E. Boria,et al.  Optimized wideband differential-mode bandpass filters with broad stopband and common-mode suppression based on multi-section stepped impedance resonators and interdigital capacitors , 2017, 2017 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO).

[7]  Dimitrios Peroulis,et al.  Multi-Stub-Loaded Differential-Mode Planar Multiband Bandpass Filters , 2018, IEEE Transactions on Circuits and Systems II: Express Briefs.

[8]  Xiao-Hua Wang,et al.  Novel balanced wideband filters using microstrip coupled lines , 2014 .

[9]  Ferran Martin,et al.  S-Shaped Complementary Split Ring Resonators and Their Application to Compact Differential Bandpass Filters With Common-Mode Suppression , 2014, IEEE Microwave and Wireless Components Letters.

[10]  Lei Zhu,et al.  Balanced Microwave Filters , 2018 .

[11]  Qinfen Xu,et al.  Slotline-Based Balanced Filter With Ultra-Wide Stopband and High Selectivity , 2020, IEEE Transactions on Circuits and Systems II: Express Briefs.

[12]  Jian-Xin Chen,et al.  High-Selectivity Tunable Balanced Bandpass Filter With Constant Absolute Bandwidth , 2017, IEEE Transactions on Circuits and Systems II: Express Briefs.

[13]  Qing-Xin Chu,et al.  Differential Wideband Bandpass Filter With High-Selectivity and Common-Mode Suppression , 2013, IEEE Microwave and Wireless Components Letters.

[14]  Feng Wei,et al.  Compact Balanced Dual-Band BPFs Based on Short and Open Stub Loaded Resonators With Wide Common-Mode Suppression , 2020, IEEE Transactions on Circuits and Systems II: Express Briefs.

[15]  Quan Xue,et al.  Compact wideband differential bandpass filter based on the double-sided parallel-strip line and transversal signal-interaction concepts , 2012 .

[16]  Qing-Xin Chu,et al.  Wideband Balanced Filters With High Selectivity and Common-Mode Suppression , 2015, IEEE Transactions on Microwave Theory and Techniques.

[17]  Jin Shi,et al.  Compact wideband-balanced bandpass filter with high-selectivity and wideband CM suppression , 2018 .

[18]  Jin Shi,et al.  Compact Differential Wideband Bandpass Filters Based on Half-Wavelength Lines , 2017, IEEE Microwave and Wireless Components Letters.

[19]  M. K. Mohd Salleh,et al.  Quarter-Wavelength Side-Coupled Ring Resonator for Bandpass Filters , 2008, IEEE Transactions on Microwave Theory and Techniques.

[20]  Lin Li,et al.  Differential Wideband Bandpass Filters With Enhanced Common-Mode Suppression Using Internal Coupling Technique , 2014, IEEE Microwave and Wireless Components Letters.

[21]  Ferran Martin,et al.  Differential bandpass filters with common-mode suppression based on stepped impedance resonators (SIRs) , 2013, 2013 IEEE MTT-S International Microwave Symposium Digest (MTT).

[22]  Jr. R. Wyndrum.  Microwave filters, impedance-matching networks, and coupling structures , 1965 .

[23]  Quan Xue,et al.  High selectivity wideband differential bandpass filter with wideband common mode suppression using Marchand balun , 2014, 2014 IEEE International Wireless Symposium (IWS 2014).

[24]  Lei Zhu,et al.  Highly Selective Differential-Mode Wideband Bandpass Filter for UWB Application , 2011, IEEE Microwave and Wireless Components Letters.

[25]  Quan Xue,et al.  A Novel Ultra-Wideband Differential Filter Based on Double-Sided Parallel-Strip Line , 2010, IEEE Microwave and Wireless Components Letters.

[26]  Weimin Wang,et al.  Planar Wideband High-Selectivity Impedance-Transforming Differential Bandpass Filter With Deep Common-Mode Suppression , 2020, IEEE Transactions on Circuits and Systems II: Express Briefs.

[27]  Vicente E. Boria,et al.  Automated Design of Common-Mode Suppressed Balanced Wideband Bandpass Filters by Means of Aggressive Space Mapping , 2015, IEEE Transactions on Microwave Theory and Techniques.

[28]  Q. Chu,et al.  An Improved Wideband Balanced Filter Using Internal Cross-Coupling and $3/4\lambda$ Stepped-Impedance Resonator , 2016, IEEE Microwave and Wireless Components Letters.

[29]  F. Medina,et al.  Differential Bandpass Filter With Common-Mode Suppression Based on Open Split Ring Resonators and Open Complementary Split Ring Resonators , 2013, IEEE Microwave and Wireless Components Letters.

[30]  Yi-Chyun Chiang,et al.  Compact wideband balanced bandpass filter with high common-mode suppression based on cascade parallel coupled lines , 2014 .

[31]  Wei Kang,et al.  A Wideband Differential BPF With Multiple Differential- and Common-Mode Transmission Zeros Using Cross-Shaped Resonator , 2014, IEEE Microwave and Wireless Components Letters.

[32]  Q. Xue,et al.  New Balance-Applications for Dual-Mode Ring Resonators in Planar Balanced Circuits (Application Notes) , 2019, IEEE Microwave Magazine.

[33]  Quan Xue,et al.  Compact Wideband Differential Bandpass Filters Using Half-Wavelength Ring Resonator , 2013, IEEE Microwave and Wireless Components Letters.

[34]  Xin Gao,et al.  High Selectivity Wideband Balanced Filters With Multiple Transmission Zeros , 2017, IEEE Transactions on Circuits and Systems II: Express Briefs.