The transmission of high-power microwave (HPM) with a frequency of 1 GHz in a plasma double-line induced by intense femtosecond laser pulses is discussed by CST software. The simulation results indicate that the EM wave can propagate around the plasma double-line rather than in the over-dense plasma with a velocity near the speed of light. It can also be obtained that the time evolution of the electric field is consistent with the duration of the incident HPM. We also discover that the electric field increases monotonically with increasing the line radius. Meanwhile, the electric field is inversely proportional to the propagation distance along the plasma double-line and the spacing between two lines. Furthermore, the attenuation value of the EM wave in the plasma transmission line can be calculated at approximately 0.03 dB/m in a double-line with an effective plasma electron density of 1016 cm–3 .
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