An Electronic Circuit Principle and Test Platform for Negative Group Delay and Superluminal Propagation

Group velocity superluminal phenomenon, also known as negative group delay or negative group velocity phenomenon, refers to a group of envelope signals at the output end of the medium before the input, on the time axis, is the envelope on leaving the medium before entering the medium, but this does not violate causality. Based on the waveguide theory of negative group delay, this paper uses the transfer function, amplitude response and phase shift response of the electronic circuit to achieve the regulation of group velocity. The actual electronic circuit is made and the testing platform and method are built. The phenomenon of negative group delay is preliminarily realized, which lays a foundation for the subsequent research. As an envelope that can carry and transmit information, the study of negative group velocity is of great significance to the improvement of signal transmission efficiency.

I. Introduction

Since the 16th century, human beings have tried to measure the speed of light and put forward the scientific idea that “the speed of light is finite In the search for faster-than-light speed, almost all of them point to German physicist Thomas Sommerfeld as the pioneer, who discussed Maxwell’s equations and tachyon particles in the early 20th century. The theory of negative group velocity and superluminal velocity does not seem to conform to causality on the surface, but in waveguide theory, group velocity can indeed exceed the speed of light or even be negative, but it does not beyond the original signal producer, but can compensate for the delay in the signal modulation process. This is of great significance in space testing, navigation systems, military positioning and so on.