The theory presented by Kumar et al. is based on the assumption that edge-coupled transmission lines (TLs) have infinite even-mode characteristic impedance and is clearly mentioned. Simulation is done to show that better than 10 dB matching can be achieved with a practical TL without using additional TL sections as long as impedance transformed by the even-mode of TL is much lower than the port impedance. The addition of extra quarter-wave TL sections can further improve the matching.

中文翻译：

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回复“使用电平衡的非对称 2.4 GHz 定向耦合器”的评论

Kumar 等人提出的理论。是基于边缘耦合传输线 (TL) 具有无限偶模特性阻抗的假设，并且已明确提及。仿真表明，只要由 TL 偶模转换的阻抗远低于端口阻抗，就可以使用实际 TL 实现优于 10 dB 的匹配，而无需使用额外的 TL 部分。添加额外的四分之一波 TL 部分可以进一步改善匹配。