Optimim design for a broadband microstrip balun

Optimim design for a broadband microstrip balun

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The letter reports calculations of Marchand balun performance which show that bandwidths approaching 50:1 (for a V.S.W.I.≤2:1) should be achievable with overlaid microstrip structures. The bandwidth limits (≲8:1) reported by previous writers appear to reflect only the inaccessibility of the true optimum to the semiempirical design methods used and the limitations of fabrication on single-thickness card. Preliminary experimental results confirm the theoretical indications.


    1. 1)
      • N. Marchand . Transmission line conversion transformers. Electronics , 142 - 145
    2. 2)
      • J.W. Mclaughlin , R.W. Grow . A wide-band balun. IRE Trans. , 314 - 316
    3. 3)
      • R. Bawer , J.J. Wolfe . A printed circuit balun for use with spiral antennas. IRE Trans. , 319 - 325
    4. 4)
      • May, D.P.L.: `Engineered designs for very wide band radio frequency transformers using printed circuit strip line techniques', 70063, Royal Aircraft Establishment Technical Report, 1970, unlimited.
    5. 5)
      • W.K. Roberts . A new wide-band balun. Proc. IRE , 1628 - 1631

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