APPARATUS FOR OPTIONALLY SUPPORTING TIME DIVISION DUPLEX AND FREQUENCY DIVISION DUPLEX IN WIRELESS COMMUNICATION SYSTEM

An apparatus for selectively supporting TDD(Time Division Duplex) and FDD(Frequency Division Duplex) in a wireless communication system is provided to configure the RF front-end unit of a base station with a plurality of switches and a plurality of band pass filters so that the base station can not only support both TDD and FDD but can also execute communication using various frequency bandwidths. An RF front-end unit in a wireless communication system comprises a plurality of band pass filters(221,223), a circulator(241), and one or more switches(211,213,215,217). The band pass filters perform band filtering for Tx signals or Rx signals. The circulator branches the paths of Tx signals and Rx signals. Each switch controls a Tx signal path and an Rx signal path. Each switch has N numbers of input/output ports which conform to electronic control, and is operated as an (N-1)-pole switch for each port. In TDD mode, each switch selects a band pass filter of which the Rx path and Tx path are identical. In FDD mode, each switch selects a band pass filter of which the Rx path and Tx path are different from each other.