Patent ID: 8861406

Claim:
A transmitter apparatus of a mobile device, the transmitter apparatus comprising: a radio frequency (RF) unit having at least two transmitting terminals configured to send wireless signals of different frequency hands; at least two transmission filters each being connected to each of the transmitting terminals of the RF unit and configured to perform a filtering process for the wireless signal of each frequency band; a first switch having at least two input terminals and a single output terminal, each input terminal being connected to each transmission filter, the first switch configured to perform a switching operation to connect one of the input terminals and the output terminal in response to a control signal; a power amplifier configured to amplify the wireless signal transmitted through the output terminal of the first switch; a second switch having a single input terminal and at least two output terminals, the input terminal being connected to the power amplifier, each output terminal corresponding to each transmission filter, the second switch configured to perform a switching operation to connect the input terminal and one of the output terminals in response to the control signal; at least two duplexers each being connected to each of the output terminals of the second switch; an antenna configured to transmit the wireless signal outputted through one of the duplexers; and a control unit configured to generate the control signal, wherein the mobile device comprises at least two subscriber identity module (SIM) cards and wherein the control unit is configured to determine the SIM card correlated with a transmission event when the transmission event occurs, and then to control the first and second switches such that the transmission filter and the duplexer selected corresponding to the SIM card are connected to the power amplifier.