R. Levy and S. Cohn, “A history of microwave filter research, design, and development,” IEEE Trans. Microw. Theory Tech, vol. 32, no. 9, pp. 1055-1067, 1984.
 J. S. Hong and M. J. Lancaster, Microstrip filters for rf/microwave applications, NY: Wiley, 2001.
 Y. Kuo and C. Chang, “Analytical design of two-mode dual-band filters using E-shaped resonators,” IEEE Transactions on Microwave Theory and Techniques, vol. 60, no. 2, pp. 250-260, 2012.
 Z. Chunxia, G. Yongxin and Y. Shaolin, “A compact dual-band filter based on dual-mode resonators,” in Proceedings of Asia-Pacific Microwave Conference, 2011.
 Y. Liu, Y. Zhao, Y. Zhou and Z. Niu, “Integrated dual-band BPF and single-band BSF for tri-band filter design,” Journal of Electromagnetic Waves and Applications, vol. 25, no. 17, pp. 2420-2428, 2011.
 S. Fu, B. Wu, J. Chen, S. Sun and C. Liang, “Novel second-order dual-mode dual-band filters using capacitance loaded square loop resonator,” IEEE Transactions on Microwave Theory and Techniques, vol. 60, no. 3, pp. 477-483, 2011.
 B. Ren, H. Liu, Z. Ma, M. Ohira, P. Wen, X. Wang and a. X. Guan, “Compact dual-band differential bandpass filter using quadruple-mode stepped-impedance square ring loaded resonators,” IEEE Access, vol. 6, p. 21850–21858, 2018.
 Y. Chang, C. Kao, M. Weng and R. Yang, “Design of the compact dual-band bandpass filter with high isolation for GPS/WLAN applications,” IEEE Microwave and Wireless Components Letters, vol. 19, no. 12, pp. 780-782, 2009.
 M. Doan, W. Che and W. Feng, “Tri-band bandpass filter using square ring short stub loaded resonators,” IET Electronics Letters, vol. 48, no. 2, pp. 106-107, 2012.
 W. Chen, M. Weng and S. Chang, “A new tri-band bandpass filter based on stub-loaded step-impedance resonator,” IEEE Microwave and Wireless Components Letters, vol. 22, no. 4, pp. 179-181, 2012.
 A. Basit, M. I. Khattak, A. R. Sebak, A. B. Qazi and A. A. Telba, “Design of a Compact Microstrip Triple Independently Controlled Pass Bands Filter for GSM, GPS and WiFi Applications,” IEEE Access, vol. 8, pp. 77156-77163, 2020.
 R. Gómez-García and R. Loeches-Sánchez, "Multi-Stub-Loaded Differential-Mode Planar Multiband Bandpass Filters," IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 65, no. 3, pp. 271-275, 2018.
 F. Wei, Y. J. Guo, P.-Y. Qin and X. W. Shi, “Compact Balanced Dual- and Tri-band Bandpass Filters Based on Stub Loaded Resonators,” IEEE Microwave and Wireless Components Letters, vol. 25, no. 2, pp. 76-78, 2015.
 H. Liu, Z. Wang, S. Hu, H.-X. Xu and B. Ren, “Design of Tri-Band Balanced Filter with Wideband Common-Mode Suppression and Upper Stopband Using Square Ring Loaded Resonator,” IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 67, no. 10, pp. 1760-1764, 2019.
 S.-X. Zhang, L.-L. Qiu and Q.-X. Chu, “Multiband Balanced Filters With Controllable Bandwidths Based on Slotline Coupling Feed,” IEEE Microwave and Wireless Components Letters, vol. 27, no. 11, pp. 974-976, 2017.
 H. Liu, Y. Song, B. Ren, P. Wen, X. Guan and H. Xu, “Balanced Tri-Band Bandpass Filter Design Using Octo-Section Stepped-Impedance Ring Resonator with Open Stubs,”IEEE Microwave and Wireless Components Letters, vol. 27, pp. 912-914, 2017.
 F. Wei, C.-Y. Zhang, H.-J. Yue and X.-W. Shi, “Balanced Quad-Band Bandpass Filter With Controllable Frequencies and Bandwidths,” IEEE Access, vol. 7, pp. 140470 - 140477, 2019.
 J. Zhang, Q. Liu, H. Liu, D. Zhang and D. Zhou, “Compact balanced tri-band superconducting band-pass filter using double square ring loaded resonators,” Int J RF Microw Comput Aided Eng, vol. 31, no. 3, 2021.
 Y. Al-Yasir, N. Ojaroudi Parchin, A. Abdulkhaleq, M. Bakr and Abd-Alhameed, “A Survey of Differential-Fed Microstrip Bandpass Filters: Recent Techniques and Challenges,” Sensors, vol. 20, no. 2356, 2020.
 V. CRNOJEVIC´-BENGIN, Advances in Multi-Band Microstrip Filters, Cambridge: Cambridge University Press, 2015.
 F. Martín, L. Zhu, J. Hong and F. Medina, Balanced Microwave Filters, Hoboken, NJ: John Wiley & Sons, Inc., 2018.
 D. Packiaraj, M. Ramesh and A. T. Kalghatgi, “Design of a tri-section folded SIR filter,” IEEE Microw. Wireless Compon. Lett., vol. 16, no. 5, pp. 317-319, 2006.
 Y. Yang, Z. Wang, L. Xu and Y. Liu, “A balanced tri-band bandpass filter with high selectivity and controllable bandwidths,” Int J RF Microw Comput Aided Eng, vol. 29, no. 12, 2019.
 C. Wang, X. Xi, Y. Zhao and X. Shi, “A miniaturized tri-band bandpass microstrip filter using multiple resonators with sharp skirts,” International Journal of Microwave and Wireless Technologies, vol. 13, no. 5, pp. 430-434, 2021.
 I. Jadidi, M. A. Honarvar and F. Khajeh-Khalil, “Compact Tri-Band Microstrip Filter Using Three Types of Resonators for Bluetooth, WiMAX , and WLAN Applications,” Progress In Electromagnetics Research C, vol. 91, pp. 241-252, 2019.
 A. Bandyopadhyay, P. Sarkar, T. Mondal and R. Ghatak, “A Dual Function Reconfigurable Bandpass Filter for Wideband and Tri-Band Operations,” IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 68, no. 6, pp. 1892-1896, 2021.
 H. Liu, Z. Wang, S. Hu, H. -X. Xu and B. Ren, “Design of Tri-Band Balanced Filter With Wideband Common-Mode Suppression and Upper Stopband Using Square Ring Loaded Resonator,” IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 67, no. 10, pp. 1760-1764, 2020.
 M. Ho and K. Tang, “Miniaturized SIW Cavity Tri-Band Filter Design,” IEEE Microwave and Wireless Components Letters, vol. 30, no. 6, pp. 589-592, 2020.
 L. Xu, H. Yue, F. Wei and X. Shi, “A balanced dual-band bandpass filter with a wide stopband and controllable differential-mode frequencies and fractional bandwidths,” International Journal of RF and Microwave Computer-Aided Engineering, 2020.
 M. Zhao, L. Xu, X. Cheng, W. Chen, W. Wu and F. Wei, “Design of a balanced dual-band BPF with high selectivity,” Microw Opt Technol Lett, vol. 62, p. 3536– 3541, 2020.
 F. Bagci, A. Fernández-Prieto, A. Lujambio, J. Martel, J. Bernal and F. Medina, “Compact Balanced Dual-Band Bandpass Filter Based on Modified Coupled-Embedded Resonators,” IEEE Microwave and Wireless Components Letters, vol. 27, no. 1, pp. 31-33, 2017.
 G. Dong, W. Wang, Y. Wu, W. Li, Y. Liu and M. M. Tentzeris, “Dual-Band Balanced Bandpass Filter Using Slotlines Loaded Patch Resonators With Independently Controllable Bandwidths,” IEEE Microwave and Wireless Components Letters, vol. 30, no. 7, pp. 653-656, 2020.
 G. Karimi, M. Amirian, A. Lalbakhsh and M. Ranjbar, “A new microstrip coupling system for realization of a differential dual-band bandpass filter,” AEU - International Journal of Electronics and Communications, vol. 99, pp. 186-192, 2019.
 Q. Zhang, C. Chen, W. Chen, D. J. and H. Zhang, “Novel balanced single/dual-band bandpass filters based on a circular patch resonator,” IET Microw. Antennas Propag, vol. 15, pp. 206-220, 2021.