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Optimum noncommensurate stepped transmission-line transformers

Optimum noncommensurate stepped transmission-line transformers

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Computer-aided pattern search has been applied to the optimisation of resistively terminated impedance transformers consisting of cascaded noncommensurate transmission-line sections. For prescribed impedance ratios and fixed numbers of sections, optimum transformer designs were found to be of the quarter-wave Cheby̅shev type, improvement over which does not seem likely.

References

    1. 1)
      • L. Solymar . Some notes on the optimum design of stepped transmission-line transformers. IRE Trans. , 374 - 378
    2. 2)
      • H.J. Riblet . A general theorem on an optimum stepped impedance transformer. IRE Trans. , 169 - 170
    3. 3)
      • R. Hooke , T.A. Jeeves . Direct search solution of numerical and statistical problems. J. Assoc. Comp. Mach. , 212 - 229
    4. 4)
      • G.L. Matthaei , L. Young , E.M.T. Jones . (1964) , Microwave filters, impedance matching networks and coupling structures.
    5. 5)
      • G.L. Matthaei . Short-step Cheby̅shev impedance transformers. IEEE Trans. , 372 - 383
    6. 6)
      • D.J. Wilde , C.S. Beightler . (1967) , Foundations of optimisation.
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