Time-domain nature of group delay

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 puls...

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Bibliographic Details
Published inChinese physics B Vol. 24; no. 10; pp. 36 - 40
Main Author 王建武 冯正和
Format Journal Article
LanguageEnglish
Published 01.10.2015
Subjects
Delay
Electric circuits
Electromagnetic fields
Electronic circuits
Group delay
Group velocity
Simulation
传播延迟
振幅调制
时域仿真
时域特性
电子电路分析
电磁场传播
群延迟
群时延
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ISSN1674-1056
2058-3834
1741-4199
DOI10.1088/1674-1056/24/10/100301

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Summary: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 superluminaiity or negativity of group velocity does not mean the supeduminal or negative propagation of the electromagnetic field.
Bibliography:energy center, group delay, time domain, superluminality
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 superluminaiity or negativity of group velocity does not mean the supeduminal or negative propagation of the electromagnetic field.
11-5639/O4
Wang Jian-Wu, Feng Zheng-He（ a） Department of Electronic Engineering, Tsinghua University, Beijing 100084, China b） Air-force Air-born Academy, Guilin 541003, China
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/24/10/100301