With the rapid development of newgeneration communication technology such as multiple-input/multiple-output technology, ultrawideband communication, and 5G technology, communication systems have higher requirements for the quality of signal transmissions. Achieving this quality requires attention not only to signal amplitude characteristics but also to phase characteristics because of the long delays and signal distortion that come with positive group delay (PGD). However, negative group delay (NGD) circuits are an effective way to compensate for PGD and decrease the variability of passband group delay.

中文翻译：

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负群延迟电路和应用：前馈放大器、相控阵天线、恒定移相器、非 Foster 元件、互连均衡和功率分配器

随着多输入多输出技术、超宽带通信、5G技术等新一代通信技术的快速发展，通信系统对信号传输质量提出了更高的要求。实现这种质量不仅需要注意信号幅度特性，还需要注意相位特性，因为正群延迟 (PGD) 会带来长延迟和信号失真。然而，负群延迟 (NGD) 电路是补偿 PGD 和降低通带群延迟可变性的有效方法。