Patent ID: 7929987
Filing Date: 2011-04-19
Classification: H03F

Abstract:
1. An apparatus for preventing degradation in RF performance due to a change in impedance of an antenna in a mobile communication terminal, the apparatus comprising: a matching circuit unit having a plurality of impedance matching circuits, corresponding to different reflection measuring values, the impedance matching circuits being designed to optimize an RF module for the mobile communication terminal according to a reflection coefficient measuring value; a reflection voltage measuring unit for measuring a reflection voltage of the antenna; a memory module for storing reflection coefficient measuring information for determining the reflection coefficient measuring value according to the reflection voltage measured by the reflection voltage measuring unit, and matching circuit information containing a plurality of reflection coefficient measuring values usable for variously differing reflection coefficient measuring values corresponding to the impedance matching circuits; and a controller for determining a reflection coefficient measuring value according to the measured reflection voltage, selecting one impedance matching circuit designed to optimize the RF module for the determined reflection coefficient measuring value from among the impedance matching circuits, and connecting the selected impedance matching circuit to the antenna.