Comments on ‘Quarter-wave transformer for a digital phase shifter’

Comments on ‘Quarter-wave transformer for a digital phase shifter’

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In a recent publication, Hering describes a method to match a ferrite-loaded waveguide. It will be shown here that this approach leads to erroneous results for most cases of interest.


    1. 1)
      • K.H. Hering . Quarter wave transformer for a digital ferrite phase shifter. Microwave J. , 67 - 69
    2. 2)
      • R.E. Collin . (1960) , Field theory of guided waves.
    3. 3)
      • R.E. Collin . (1966) , Foundations for microwave engineering.
    4. 4)
      • N. Eberhardt . Propagation in the off-center Eplane dielectrically loaded waveguide. IEEE Trans. , 282 - 289
    5. 5)
      • Gardiol, F.E.: `Higher order modes in dielectrically loaded wave-guides', report MW-68-2, 1968.
    6. 6)
      • A.D. Berk . Variational principles for electromagnetic resonators and waveguides. IRE Trans. , 104 - 111
    7. 7)
      • R.M. Walker . Waveguide impedance, too many definitions. Electronic Communicator , 3

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