An antenna system is disclosed. In the antenna system, a first antenna element array includes multiple antenna elements, where the antenna elements are configured to receive and transmit signals in two different polarization directions; the first combiner-splitter is configured to combine signals, received by the multiple antenna elements; the active module is configured to receive combined signals in the two different polarization directions, and perform frequency translation on the combined signals to obtain baseband signals; at least one pair of receiving channels in the antenna system corresponds to a second antenna apparatus, and are configured to receive signals output by the second antenna apparatus in the two different polarization directions; and the active module is further configured to perform frequency translation on the signals received by the at least one pair of receiving channels to obtain baseband signals. In this way, the network performance gain is improved.