An antenna system, comprising: N radio frequency channels, M columns of antennas, M-N power splitters, and M-N 1-bit phase shifters, wherein N is an even number, N<M≤2N, the M columns of antennas are sequentially sorted from 1 to M and form an antenna array, and two neighboring columns of antennas have neighboring sequence numbers; any of the N radio frequency channels is configured to send a radio frequency signal to drive one or two columns of the M columns of antennas; the M columns of antennas are configured to receive radio frequency signals from the N radio frequency channels and form a target beam, and only one column of two columns of antennas driven on a same radio frequency channel are connected to one of the M-N phase shifters, and is also connected to one of the M-N power splitters; any of the M-N power splitters is configured to split power for the two columns of antennas connected to the radio frequency channel; any of the M-N phase shifters is configured to adjust a phase of a radio frequency signal received by an antenna connected to the phase shifter to 0 degrees or 180 degrees; and connection modes of the M columns of antennas and the M-N phase shifters comprise: if M is an even number, in the M columns of antennas, an (M/2-N/2+1)' to an (M/2+N/2) th columns of antennas are not connected to a phase shifter, and remaining M-N columns of antennas are connected to the M-N phase shifters; and if M is an odd number, in the M columns of antennas, N columns of antennas that have consecutive sequence numbers and that are in a second to an M th columns of antennas are not connected to a phase shifter, and remaining M-N columns of antennas are respectively connected to the M-N phase shifters, or N columns of antennas that have consecutive sequence numbers and that are in a first to an (M-1) th columns of antennas are not connected to a phase shifter, and remaining M-N columns of antennas are respectively connected to the M-N phase shifters. N radio frequency channels, M columns of antennas, M-N power splitters, and M-N 1-bit phase shifters, wherein N is an even number, N<M≤2N, the M columns of antennas are sequentially sorted from 1 to M and form an antenna array, and two neighboring columns of antennas have neighboring sequence numbers; any of the N radio frequency channels is configured to send a radio frequency signal to drive one or two columns of the M columns of antennas; the M columns of antennas are configured to receive radio frequency signals from the N radio frequency channels and form a target beam, and only one column of two columns of antennas driven on a same radio frequency channel are connected to one of the M-N phase shifters, and is also connected to one of the M-N power splitters; any of the M-N power splitters is configured to split power for the two columns of antennas connected to the radio frequency channel; any of the M-N phase shifters is configured to adjust a phase of a radio frequency signal received by an antenna connected to the phase shifter to 0 degrees or 180 degrees; and connection modes of the M columns of antennas and the M-N phase shifters comprise: if M is an even number, in the M columns of antennas, an (M/2-N/2+1)' to an (M/2+N/2) th columns of antennas are not connected to a phase shifter, and remaining M-N columns of antennas are connected to the M-N phase shifters; and if M is an odd number, in the M columns of antennas, N columns of antennas that have consecutive sequence numbers and that are in a second to an M th columns of antennas are not connected to a phase shifter, and remaining M-N columns of antennas are respectively connected to the M-N phase shifters, or N columns of antennas that have consecutive sequence numbers and that are in a first to an (M-1) th columns of antennas are not connected to a phase shifter, and remaining M-N columns of antennas are respectively connected to the M-N phase shifters. if M is an even number, in the M columns of antennas, an (M/2-N/2+1)' to an (M/2+N/2) th columns of antennas are not connected to a phase shifter, and remaining M-N columns of antennas are connected to the M-N phase shifters; and if M is an odd number, in the M columns of antennas, N columns of antennas that have consecutive sequence numbers and that are in a second to an M th columns of antennas are not connected to a phase shifter, and remaining M-N columns of antennas are respectively connected to the M-N phase shifters, or N columns of antennas that have consecutive sequence numbers and that are in a first to an (M-1) th columns of antennas are not connected to a phase shifter, and remaining M-N columns of antennas are respectively connected to the M-N phase shifters.