Wave Anomalous Propagation In The Waveguide

Electronic tunneling is a key aim of scientists in many countries. Especially, the measurement of the tunneling time, the traversal time through barrier, has confused scientists for more than half century. However , with the research of tunneling time, scientists has found some interesting phenomena.In1992,Using a two-photon interferometer, American Professor Chiao and his colleagues measured the time delay for single photon to tunnel cross a barrier consisting of a 1-um-thick 1D photonic band-gap material, then they gained the result that the photon tunnels across the barrier by speed of . In 1992, A. Enders and G..Nimtz researched the propagation of microwave signal through several different cutoff waveguides with HP8510B network analyzer(NA) system and HP70820 transition analyzer(TA) system .Since 1990s, Emig, Martin and Landauer have been investigating the propagation of electromagnetic pulse through a waveguide with piecewise different dielectric constants.In this paper, first , the study of the distribution of electromagnetic field , energy, power, reflection coefficient and transmission coefficient in waveguide with piecewise different dielectric constants are studied .Then, the behavior of propagation of AM signal and Gauss pulse signal through the waveguide are simulated by MAGIC code,and the plots of electromagnetic field, energy, Ponyting vector and their spectrums at different time and different position are obtained .And, the group velocity and energy velocity of wave packet through barrier are calculated.