FIELD: electricity.
SUBSTANCE: duplexer provides for a differential received signal in the RX+ and RX- ports. The received differential signal includes an in-phase noise signal that may originate from the transmitted signal. The in-phase signal is attenuated by an in-phase filter within the circuit matching impedance related to the RX+ and RX- ports. The impedance matching circuit includes the first passive circuit put in between the RX+ port and the first unit, the second passive circuit put in between the RX- port and the second unit and an in-phase filter put in between the first and the second units. In one circuit the in-phase filter includes the includes the first inductance coil put in between the first unit and the common unit, the second inductance coil put in between the second unit and the common unit and a capacitor put in between the common unit and the ground bus.
EFFECT: receiver operation improvement due to in-phase signal attenuation.
25 cl, 7 dwg
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