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This paper presents an important overview on the RF switches for wide-band, broad-band and multi-band RF front-end of wireless communications. This paper is mainly focused on the discussion of the circuit configuration of RF switches that using Time Division Duplex (TDD) switching in wireless communications such as WiMAX, WiFi and LTE. The previous research works on the RF switches for wide-band, broad-band and multi-band RF front-end are discussed in term of technology used, circuit design, performance and its applications.