Power supply circuit of radio antenna

The invention provides the power supply circuit of a radio antenna. The power supply circuit comprises a power supply, a high-order low pass filtering unit and a trapped wave unit. The order of the high-order low pass filtering unit is N. The trapped wave unit comprises (N-1) trapped wave filters, and the N is greater than or equal to 2. The high-order low pass filtering unit is used for receivinga power supply signal generated by the power supply and carrying out filtering processing on the power supply signal so as to acquire a first filtering signal. The trapped wave unit is used for receiving the first filtering signal, carrying out offset processing on the resonant peak of the first filtering signal and acquiring a second filtering signal so as to provide power for the radio antenna.In the scheme, a noise nearby an amplitude modulation or frequency modulation band can be effectively attenuated. 本公开提供种收音机天线的供电电路。供电电路包括：供电电源、高阶低通滤波单元以及陷波单元，所述高阶低通滤波单元的阶数为N，所述陷波单元包括(N-1)个陷波滤波器，N≥2，所述高阶低通滤波单元，用于接收所述供电电源产生的电源信