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Discussions on Arbitrary Termination Impedances, Arbitrary Power Division, and Small-Sized Ring Hybrids
  • Rakesh Sinha
Rakesh Sinha
National Institute of Technology Rourkela,

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In the above paper, Ahn et al. proposed a small-size four-port in-phase and out-of-phase hybrid coupler. However, the design equations proposed in [1, eq.(9)] are incorrect. In this letter, the incorrectness of the design equations has been demonstrated through a numerical example. Also, corrected design equations are provided in this letter for small-size couplers with unequal port impedances.