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In order to meet the needs of engineering,plasma antenna must meet the requirement in terms of gain,bandwidth,noise,electromagnetic compatibility(EMC)and so on.A plasma antenna prototype was established by 5-20KHz high voltage ac power,whose radiation characteristics and electromagnetic compatibility was tested and analyzed.Results show that 5-20KHz ac plasma antenna is of broadband impedance characteristics.Compared with 50Hz ac plasma antenna,the noise reduces and the gain increases from 150MHz to 350MHZ.