A dual-band balun with inherent impedance transformation is presented in this paper. The inherent impedance transformation ratio from a range of 0.4 to 4.0 makes the balun ideal for the on-chip fabrication. The proposed dual-band balun exhibits excellent input port matching, equal output signal with phase di erence of 180, and extremely good isolation and matching at the output ports. A table is provided with the design parameters at the extreme impedance transformation ratios. The design concept of the proposed balun has been validated through a prototype fabricated on a Rogers RO5880 substrate. The measurement results are in good agreement with the EM simulation measurements.
2. Zhang, W., Y. Wu, W. Wang, and X. Shen, "Planar compact dual-band coupled-line balun with high isolation," China Commun., Vol. 14, 40-48, 2017.
doi:10.1109/CC.2017.7868173
3. Yao, L., Y. Wu, M. Li, and Y. Liu, "Three-dimensional high-isolated dual-band balun using doublesided parallel-strip line with inserted conductor plane," Electron. Lett., Vol. 53, 1211-1213, 2017.
doi:10.1049/el.2017.1954
4. Ahn, H.-R. and T. Itoh, "New isolation circuits of compact impedance-transforming 3-dB baluns for theoretically perfect isolation and matching," Trans. Microw. Theory Techn., Vol. 58, No. 12, 3892-3902, 2010.
5. Wu, Y., L. Yao, W. Zhang, W. Wang, and Y. Liu, "A planar dual-band coupled-line balun with impedance transformation and high isolation," IEEE Access, Vol. 4, 9689-9701, 2016.
doi:10.1109/ACCESS.2016.2640187
6. Aboualalaa, M., A.-B. Abdel-Rahman, A. Allam, H. Elsadek, and R.-K. Pokharel, "Design of a dual-band microstrip antenna with enhanced gain for energy harvesting applications," Antennas Wirel. Propag. Lett., Vol. 16, 1622-1626, 2017.
doi:10.1109/LAWP.2017.2654353
7. Kanaya, H., T. Nakamura, K. Kawakami, and K. Yoshida, "Design of coplanar waveguide matching circuit for RF-CMOS front-end," Electron. Commun. Jpn II, Vol. 88, No. 7, 1017-1023, 2005.
8. Li, X., L. Yang, S.-X. Gong, and Y.-J. Yang, "Dual-band and wideband design of a printed dipole antenna integrated with dual-band balun," Progress In Electromagnetics Research Letters, Vol. 6, 165-174, 2009.
doi:10.2528/PIERL08120504
9. Xian, J. Z., X. Q. Lin, L. Y. Nie, J.W. Yu, and Y. Fan, "Wideband dual-polarization patch antenna array with parallel strip line balun feeding," IEEE Antennas Wireless Propag. Lett., Vol. 15, 1499-1501, 2016.
10. Yu, J., Y. Sun, H. Zhu, F. Li, and Y. Fang, "Stacked-patch dual-band and dual-polarized antenna with broadband baluns for WiMAX and WLAN applications," Progress In Electromagnetics Research M, Vol. 68, 41-52, 2018.
doi:10.2528/PIERM18022501
11. Zhang, Z., M. F. Iskander, J. C. Langer, and J. Mathews, "Dual-band WLAN dipole antenna using an internal matching circuit," IEEE Trans. Antennas Propagat., Vol. 53, No. 5, 1813-1818, 2005.
doi:10.1109/TAP.2005.846784
12. Gao, J. P., X. X. Yang, J. S. Zhang, and J. X. Xiao, "A printed volcano smoke antenna for UWB and WLAN communications," Progress In Electromagnetics Research Letters, Vol. 4, 55-61, 2008.
doi:10.2528/PIERL08051102
13. Ahn, H. and T. Itoh, "Isolation circuit of impedance-transforming 3-dB compact baluns for near perfect output matching and isolation," IEEE MTT-S International Microwave Symposium, 113-116, Anaheim, CA, 2010.
14. Zhang, W., Y. Liu, Y. Wu, W. Wang, M. Su, and J. Gao, "A complex Impedance-transforming coupled-line balun," Progress In Electromagnetics Research Letters, Vol. 48, 123-128, 2014.
doi:10.2528/PIERL14062402
15. Gupta, R. and M. S. Hashmi, "High impedance transforming simplified Balun architecture in microstrip technology," Microw. Optical Technol. Lett., Vol. 60, No. 12, 3019-3023, 2018.
doi:10.1002/mop.31450
16. Nikravan, M.-A. and Z. Atlasbaf, "T-section dual-band impedance transformer for frequencydependent complex impedance loads," Electron. Lett., Vol. 47, No. 9, 551-553, 2011.
doi:10.1049/el.2010.7452
17. Monzon, C., "Analytical derivation of a two-section impedance transformer for a frequency and its first harmonic," IEEE Microw. Wirel. Compon. Lett., Vol. 12, No. 10, 381-382, Oct. 2002.
doi:10.1109/LMWC.2002.804558
Submit
