In the embodiment of FIG. 2, in a transmit state, to-be-transmitted signals are first sent to the four transmit radio frequency channels by using the divider 16, then are sent to corresponding feeds by using corresponding single-pole multi-throw switches, and are radiated outwards by using reflection of a reflector, where a direction of beams radiated outwards can be finely controlled by adjusting an adjustable gain amplifier and/or a phase shifter, and a direction of beams radiated outwards can be widely controlled by controlling a single-pole multi-throw switch. In a receive state, received signals are reflected by the reflector to feeds and are transmitted to the corresponding receive radio frequency channels, and then the combiner 17 combines the received signals of the four receive radio frequency channels, where a direction of beams of the received signals can be finely controlled by adjusting an adjustable gain amplifier and/or a phase shifter, and a direction of beams of the received signals can be widely controlled by controlling a single-pole multi-throw switch.

FIG. 4 shows a method for alignment by using the foregoing reflector antenna, and the method includes the following steps:

S401. Set a correspondence between a radio frequency channel and a feed as a test correspondence.

S402. Detect power of a signal received by each radio frequency channel.

S403. Determine an alignment correspondence between the radio frequency channel and the feed according to the power of the signal received by the radio frequency channel.

S404. Set the correspondence between a radio frequency channel and a feed as the alignment correspondence.