Design and Analysis of Millimeter-Wave Marchand Balun with Interconnected Transmission Line

  • Lei-jun Xu
  • Zhi-gong Wang
  • Qin Li


This paper presents the design and analysis of general baluns of Marchand-type with a transmission line connected between two sections. A series of new expressions of S-parameters are derived for such type of Marchand balun. The relations between the length of interconnected transmission line and the imbalance of Marchand balun are discussed. By using analytical method, a millimeter-wave Marchand balun was designed and simulated by the full-wave electromagnetic software HFSS, and fabricated in 0.15 µm pHEMT GaAs process. The measurement results show that the balun achieves low insertion loss and good balance in the band of 24–40 GHz. The results are in good agreement with the simulated ones. The theoretical analysis is verified.


Balun MMIC Millimeter-wave Transmission line Coupled line 


  1. 1.
    S. A. Maas, F. M. Yamada, A. K. Oki, N. Matovelle, and C. Hochuli, “An 18-40 GHz monolithic ring mixer,” IEEE Radio Frequency Integrated Circuits Symposium, 29–32 (1998).Google Scholar
  2. 2.
    P. C. Hsu, C. Nguyen, and M. Kintis, Uniplanar broad-band push–pull FET amplifiers. IEEE Transactions on Microwave Theory and Techniques 45(50), 2150–2152 (1997).CrossRefGoogle Scholar
  3. 3.
    S. A. Maas and Y. Ryu, “A broadband, planar, monolithic resistive frequency doubler,” IEEE Int. Microwave Symp. Dig., 443–446 (1994).Google Scholar
  4. 4.
    H. -K. Chiou, and T. -Y. Yang, Low-loss and broadband asymmetric broadside-coupled balun for mixer design in 0.18-um CMOS Technology. IEEE Transactions on Microwave Theory and Techniques 56(4), 835–848 (2008).CrossRefGoogle Scholar
  5. 5.
    K. W. Kobayashi, “A novel HBT active transformer balanced Schottky diode mixer,” IEEE MTT International Microwave Symposium Digest, 947–950 (1996).Google Scholar
  6. 6.
    P. -S. Wu, C. -H. Wang, T. -W. Huang, and H. Wang, Compact and broad-band millimeter-wave monolithic transformer balanced mixers. IEEE Transactions on Microwave Theory and Techniques 53(10), 3106–3114 (2005).CrossRefGoogle Scholar
  7. 7.
    Y. J. Yoon, Y. Lu, R. C. Frye, M. Y. Lau, P. R. Smith, L. Ahlquist, and D. P. Kossives, Design and characterization of multilayer spiral transmission-line baluns. IEEE Transactions on Microwave Theory and Techniques 47(9), 1841–1847 (1999).CrossRefGoogle Scholar
  8. 8.
    H. -J. Wei, C. Meng, P. -Y. Wu, and K. -C. Tsung, K-band CMOS sub-harmonic resistive mixer with a miniature marchand balun on lossy silicon substrate. IEEE Microwave and Wireless Components Letters 18(1), 40–42 (2008).CrossRefGoogle Scholar
  9. 9.
    C. -S. Lin, P. -S. Wu, M. -C. Yeh, J. -S. Fu, H. -Y. Chang, K. -Y. Lin, and H. Wang, Analysis of multiconductor coupled-line marchand baluns for miniature MMIC design. IEEE Transactions on Microwave Theory and Techniques 55(6), 1190–1199 (2007).CrossRefGoogle Scholar
  10. 10.
    R. Mongia, I. Bahl, and P. Bhartia, RF and microwave coupled-line circuits. (Artech house, Norwood, 1999).Google Scholar
  11. 11.
    K. Sachse, The scattering parameters and directional coupler analysis of characteristically terminated asymmetric coupled transmission lines in an inhomogeneous medium. IEEE Transactions on Microwave Theory and Techniques 38(4), 417–425 (1990).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.Institute of RF- & OE-ICsSoutheast UniversityNanjingP. R. China
  2. 2.School of Electrical and Information Engineering of Jiangsu UniversityZhenjiangP. R. China

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