Patent ID: 8412261
Filing Date: 2013-04-02
Classification: G06K,H01P,H04B

Abstract:
1. A transceiver comprising a transmitting unit, a receiving unit, and a coupling apparatus for dividing a radio frequency (RF) transmitting signal and an RF receiving signal in the transceiver with the transmitting unit and the receiving unit sharing an antenna, comprising: a four-port circuit having port an attenuator attenuating and outputting a signal output from the port wherein the RF transmitting signal is input to the port wherein the attenuator is a variable attenuator operable to control variably an attenuation value, and the receiving unit includes: a low-noise amplifier subtracting and amplifying an output signal of the attenuator from an output signal of the port a received signal strength indicator (RSSI) measuring unit measuring an RSSI of a transmission leakage signal based on an output of the low-noise amplifier; and a control unit controlling an attenuation value of the attenuator based on the measured RSSI.