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

Abstract

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.