Patent ID: 8670726

Claim:
A front end module for use with a first and a second radio frequency transceiver operative at different carrier frequencies, the front end module comprising: a control circuitry in communication with each of the first transceiver and the second transceiver; a first antenna connection port; a second antenna connection port; a third antenna connection port; a first output port arranged to provide a first received signal to the first radio frequency transceiver; a second output port arranged to provide a second received signal to the first radio frequency transceiver; a third output port arranged to provide a received signal to the second radio frequency transceiver; a first input port arranged to receive a transmit signal from the first radio frequency transceiver; a second input port arranged to provide a transmit signal from the second radio frequency transceiver; a first filter arranged to pass the frequency components in the carrier frequency bandwidth of the first radio frequency transceiver and substantially attenuate frequency components in the carrier frequency bandwidth of the second radio frequency transceiver; and a plurality of electronically controlled switches, each responsive to said control circuitry, wherein said control circuitry is arranged to: in the event that said second transceiver is active, couple one of the second input port and the third output port to the second antenna port; in the event that the first and second radio frequency transceivers are simultaneously operative, and said first radio frequency transceiver is in a transmit mode, set said plurality of electronically controlled switches to couple the first input port to said first antenna connection port via said first filter; in the event that said first and second radio frequency transceivers are not simultaneously operative, and said first radio frequency transceiver is in a transmit mode, set said plurality of electronically controlled switches to bypass said first filter and couple the first input port to one of said first antenna connection port and said third antenna connection port; and in the event said first radio frequency transceiver is in a receive mode, set said plurality of electronically controlled switches to couple said first antenna connection port to said first output port and couple said third antenna connection port to said second output port to thereby provide receive antenna diversity for said first radio frequency transceiver in the receive mode.