Time-domain nature of group delay

doi:10.1088/1674-1056/24/10/100301

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.

Keywords: energy center group delay time domain superluminality

Received: 04 January 2015
Revised: 13 April 2015
Accepted manuscript online:

PACS:	03.30.+p	(Special relativity)
	04.30.Nk	(Wave propagation and interactions)
	41.20.Jb	(Electromagnetic wave propagation; radiowave propagation)

Fund: Project supported by the National Basic Research Program of China (Grant No. 2013CB329002) and the National Natural Science Foundation of China (Grant No. 61371012).

Corresponding Authors: Wang Jian-Wu
E-mail: wangjianwuradar@163.com

Cite this article:

Wang Jian-Wu (王建武), Feng Zheng-He (冯正和) Time-domain nature of group delay 2015 Chin. Phys. B 24 100301

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