Time-domain Nature of Group Delay*Project Supported by the National Basic Research Program of China (Grant No. 2013CB329002) and the National Natural Science Foundation of China (Grant No. 61371012).

Download or read book Time-domain Nature of Group Delay*Project Supported by the National Basic Research Program of China (Grant No. 2013CB329002) and the National Natural Science Foundation of China (Grant No. 61371012). written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The characteristic of group delay is analyzed based on an electronic circuit, and its time-domain nature is studied with time-domain simulation and experiment. The time-domain simulations and experimental results show that group delay is the delay of the energy center of the amplitude-modulated pulse, rather than the propagation delay of the electromagnetic field. As group velocity originates from the definition of group delay and group delay is different from the propagation delay, the superluminality or negativity of group velocity does not mean the superluminal or negative propagation of the electromagnetic field.