| 摘要 |
An antenna duplexer ( 14' ) comprises a transmission (TX) filter ( 16 ) having an input and an output. The TX filter input is arranged to connect to a TX port of a mobile telecommunications handset and the TX filter output is arranged to connect to an antenna ( 12 ) for the mobile telecommunications handset. The duplexer further includes a Dual Mode Surface Acoustic Wave (SAW) type receiver (RX) filter ( 18' ) having an input and a balanced output. The RX filter input is arranged to connect to the antenna ( 12 ) and the RX filter output is arranged to connect directly to a balanced input RX port of the mobile telecommunications handset.
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