Patent ID: 8731487

Claim:
A device for four-frequency transceiving of a Global System for Mobile Communication (GSM), comprising a Power Amplifier (PA), a radio frequency transceiver chip and a double-frequency antenna switch, a GSM low frequency filter and a GSM high frequency filter and characterised by a double frequency antenna switch and a baseband control chip and in that: the double-frequency antenna switch is connected with the baseband control chip and is configured to receive control signals sent by the baseband control chip; and, according to the control signals, to transmit signals between an antenna and one of only four lines of which two are connected with the PA, one is connected to the GSM low frequency filter and one is connected to the GSM high frequency filter; wherein, the double-frequency antenna switch may be connected by only one line with a GSM low frequency band output line of the PA, or a GSM high frequency band output line of the PA, or the GSM low frequency filter or the GSM high frequency filter; the GSM low frequency filter is connected with the double-frequency antenna switch and the radio frequency transceiver chip, and is configured to: receive signals of a first frequency band or a second frequency band which are transmitted by the double-frequency antenna switch via a single line, make the signals of the first frequency band or the second frequency band pass and filter out signals of other frequency bands, and transmit the signals of the first frequency band or the second frequency band to the radio frequency transceiver chip; and the GSM high frequency filter is connected with the double-frequency antenna switch and the radio frequency transceiver chip, and is configured to: receive signals of a third frequency band or a fourth frequency band which are transmitted by the double-frequency antenna switch via a single line, make the signals of the third frequency band or the fourth frequency band pass and filter out signals of other frequency bands, and transmit the signals of the third frequency band or the fourth frequency band to the radio frequency transceiver chip.