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Time-domain nature of group delay |
Wang Jian-Wu (王建武)a b, Feng Zheng-He (冯正和)a |
a Department of Electronic Engineering, Tsinghua University, Beijing 100084, China; b Air-force Air-born Academy, Guilin 541003, China |
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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.
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Received: 04 January 2015
Revised: 13 April 2015
Accepted manuscript online:
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PACS:
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03.30.+p
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(Special relativity)
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04.30.Nk
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(Wave propagation and interactions)
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41.20.Jb
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(Electromagnetic wave propagation; radiowave propagation)
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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
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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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