电领域群速超光速的特性实验

探讨了电信号在阻抗周期失配的类光子晶体结构中的群速超光速传播问题。比较了在电领域出现群速超光速情况下与正常光速下的各种区别，发现了群速超光速的速度是很不稳定的。一旦出现了群速超光速，速度是不断变化的，群速超光速情况下的群速度会受传输路径、温度、传输信号的幅度、阻抗变化等稳定度的影响，和正常传输时的情况是完全不同的。测得的群速超光速是一个不断起伏变化的值。就这点来看，目前很难确定其应用的价值。群速超光速已经被不同的研究者在光和电的领域发现。用实验证明了群速超光速是一种不稳定的自然现象。通常情况下，光和电磁信号以正常的速度传递时，该速度不会受到传播路径的长度、温度、时间、负载、传播信号的幅度、调制信号的频率等因素的影响。

Experimental Study on the Characteristics of Superluminal Group Velocity in Electric Domain

In this paper we discuss the superluminal group propagation velocity of the electric signal along the spatially periodic mismatched-impedance circuit which is similar to the photon crystal.We discover that the superluminal group velocity is an unstable phenomenon after the comparison between the superluminal group velocity and the normal velocity of light.Once the superluminal group velocity occurs,the velocity will continuously change.The superluminal group velocity can be influenced by the length of trans...