A radio-frequency transceiver system, configured to support multiple-input multiple-output communication technology, includes a first complex antenna having a plurality of first antenna units; and a second complex antenna, having a plurality of second antenna units. The plurality of first antenna units and the plurality of second antenna units are regularly and alternately arranged to form an annular structure, and the first complex antenna and the second complex antenna are switched between a single-beam mode and a combined-beam mode respectively to transmit or receive radio-frequency signals.