The space crafts,such as spaceship,space shuttle and so on,will face a famous blackout problem when they re-enter the earth's atmosphere at high velocity.The plasma sheath severely affects the propagation of the incident electromagnetic wave and causes severe electromagnetic wave attenuation,which results in the communication failures between the space crafts and the ground control center.It is important to study the properties of terahertz wave propagation in non-magnetized plasma,for using the terahertz w...