Abstract
In the mentioned article, Peng et al. proposed a three-port power divider (PD) and four-port coupler with tunable power division ratio based on: 1) cascade connection of 3-dB in-phased PD, matched tunable difference phase transmission lines (TLs), and 3-dB quadrature branch line coupler (QBLC) and 2) cascade connection of QBLC, mismatched in-phased TLs, and QBLC. However, the proposed four-port coupler provides an undesired phase difference of 90° between the output signals. Also, the scattering parameter analysis of the second design seems to be incorrect. In this letter, a correct approach is provided to analyze S-parameters.
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