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《Journal of Beijing Broadcasting Institute》 2004-S1
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Superluminal and Negative Group Velocity in Electro-magnetic Wave Propagation

HUANG Zhi-xun,LU Gui-zhen,GUAN Jian (Beijing Broadcasting Institute, Beijing 100024,P. R.China)  
In this paper, a penetrating analysis is first made of the superluminal and negative group velocities that occur in the EM wave propagation. Discussed then are the superluminal and negative group velocities which are in the state of evanescent waves in the waveguide below-cutoff (WBCO). Through an experiment in the coaxial photonic crystal a group velocity of 1.5 - 2.4 times the speed of light are observed in the stop band.
【Key Words】: Superluminal group velocity Negative group velocity Coaxial photonic crystal Waveguide below-cutoff(WBCO)
【CateGory Index】: O412.1
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