In FIG. 2, four single-pole multi-throw switches are used to control a correspondence between a radio frequency channel and a feed. A radio frequency channel is in a one-to-one correspondence with a single-pole multi-throw switch. A radio frequency channel is connected to a single-pole end of a single-pole multi-throw switch, that is, the radio frequency channel 13a is connected to a single-pole end of a single-pole multi-throw switch 14a, the radio frequency channel 13b is connected to a single-pole end of a single-pole multi-throw switch 14b, the radio frequency channel 13c is connected to a single-pole end of a single-pole multi-throw switch 14c, and the radio frequency channel 13d is connected to a single-pole end of a single-pole multi-throw switch 14d. One single-pole multi-throw switch corresponds to a plurality of feeds, and the feeds are connected to multi-throw ends of the single-pole multi-throw switch, that is, multi-throw ends of the single-pole multi-throw switch 14a are respectively connected to a1, a2, a3, and a4 in the feed array, multi-throw ends of the single-pole multi-throw switch 14b are respectively connected to b1, b2, b3, and b4 in the feed array, multi-throw ends of the single-pole multi-throw switch 14c are respectively connected to c1, c2, c3, and c4 in the feed array, and multi-throw ends of the single-pole multi-throw switch 14d are respectively connected to d1, d2, d3, and d4 in the feed array. In this example, each single-pole multi-throw switch is connected to only four feeds in the feed array and the four feeds do not conflict with each other. This is merely for ease of description, and actual application is not limited to this.