Patent ID: 9408160
Filing Date: 2016-08-02
CPC Classification: H04B,H04W

Claim Text:
1. An apparatus for restricting a transmission output of a portable terminal, comprising: a radio frequency (RF) unit to detect a transmission power reflected based on a degree of mismatching of an antenna and to measure a transmission power including the reflected transmission power; and a controller to restrict the transmission power to have lower value than a predetermined value when the transmission power including the reflected transmission power measured by the RF unit is greater than or equal to the predetermined value, wherein detecting the reflected transmission power, executing the transmission output at the restricted transmission power, and executing a normal operation of the transmission output are performed by the same antenna, wherein the RF unit comprises: a circulator to transmit the reflected transmission power, a power detector to detect the reflected transmission power from the circulator, and a power measuring unit to measure the transmission power including the reflected transmission power received from the power detector, and wherein the circulator is disposed between a duplexer and a pulse amplitude modulator (PAM), so as to prevent the reflected transmission power received through the duplexer from being transmitted back to the PAM.