This paper develops an original theory of bandpass (BP) negative group delay (NGD) function from three-port symmetric circuit. The BP NGD analysis is applied first time to three-port topology. The present study develops originally a BP NGD investigation of three-port circuit constituted by R, L and C lumped components. The equivalent S-matrix modelling is elaborated with the uncommon circuit theory. To validate the theory, a lumped circuit proof of concept is designed and simulated. A group delay value of about −0.3 ns is observed at the NGD centre frequency of about 76 MHz over 214 MHz bandwidth. For the further understanding on the BP NGD behaviour, a parametric study with the variations of the resistor, inductor and capacitor components of the Y-tree is performed. The results of the present study guarantee a potential microwave communication application of BP NGD function notably for systems operating with ISM and IEEE 802.11 standards.

本文从三端口对称电路发展了带通 (BP) 负群延迟 (NGD) 函数的原始理论。BP NGD 分析首次应用于三端口拓扑。本研究最初开发了由 R、L 和 C 集总组件构成的三端口电路的 BP NGD 研究。等效 S 矩阵建模是用不常见的电路理论阐述的。为了验证该理论，设计并模拟了集总电路概念验证。在 214 MHz 带宽上约 76 MHz 的 NGD 中心频率处观察到约 -0.3 ns 的群延迟值。为了进一步了解 BP NGD 的行为，我们对 Y 树的电阻器、电感器和电容器组件的变化进行了参数研究。