As a kind of special electromagnetic medium, femtosecond laser plasma has the potential of transmitting theelectromagnetic wave. In this paper, a theoretical study on 6 GHz EM wave guiding performance of the plasma filamentis carried out with the software XFDTD. Then, an experimental setup for the interaction between the EM wave and theplasma filaments is established. Based on the data measured by oscilloscope, the transmission properties of the EM wavealong the filament are obtained. The results show the electric field is enhanced out of the waveguide with the plasmafilament. The guiding performance of the plasma filament on the TE polarization wave is better than that on the TM one,which is consistent with the experimental results. For TE polarization wave, the plasma filament can reduce thetransmission pulse energy greatly and the attenuation is up to 3.5 dB in the experiment. The research results show thatthe laser plasma filament can provide efficient transmission of the EM wave energy.
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