A radio frequency front end system has a first transmit path and a first receive path. There is a first transmit filter within the first transmit path and a first receive filter within the first receive path. One or more switches can be configured to selectively connect a first antenna to the first transmit filter and to selectively connect a second antenna to the first receive filter to allow frequency division duplex communication over the first transmit path and the first receive path in which the first transmit path transmits over the first antenna simultaneous with the first receive path receiving over the second antenna.