等离子体天线激励源的频率较高时,电磁干扰更加严重,电磁兼容性问题亟待解决。借助场强仪、频谱仪及光谱仪等相关仪器,实验研究了在40.68 MHz激励条件下等离子体天线的电磁兼容性,并同直流、低频交流激励模式下的等离子体天线进行了比较。结果发现,等离子体本身可以产生感应场,场强随电子密度的增大而增大,但一般≤3 V/m,仅通过增大距离便可消除。40.68 MHz交流激励源辐射干扰功率高于直流、低频交流激励源近50 dB。同时谐波的干扰也非常大,最强谐波干扰为激励信号干扰的10-3倍。以光谱仪作为敏感设备,发现高频交流源导致了光谱仪的输出光谱严重频移。通过设计滤波器、屏蔽的办法可大幅度减小激励源的辐射干扰,提高天线的电磁兼容性。 When the frequency of the plasma antenna excitation source is high, the electromagnetic interference is more serious and the electromagnetic compatibility problem needs to be solved urgently. The electromagnetic compatibility of the plasma antenna under the excitation of 40.68 MHz was experimentally studied with the help of field instruments, spectrum analyzers and spectrometers, and compared with those of the plasma antenna under DC excitation and low frequency AC excitation. The results show that the plasma itself can produce an induced field, the field strength increases with the increase of electron density, but usually ≤ 3 V / m, which can be eliminated only by increasing the distance. The radiation interference power of the 40.68 MHz AC excitation source is higher than that of DC and low frequency AC excitation sources by nearly 50 dB. Harmonic interference is also very large at the same time, the strongest harmonic interference is 10-3 times the excitation signal interference. With the spectrometer as a sensitive device, it was found that the high frequency AC source caused a severe spectral shift of the output spectrum of the spectrometer. By designing the filter, the shielding method can greatly reduce the radiation interference of the excitation source and improve the electromagnetic compatibility of the antenna.