Patent ID: 6718157
Filing Date: 2004-04-06
Classification: H03H,H04B

Abstract:
An apparatus for commonly using an antenna for a call signal and a television (TV) broadcasting signal in a radio communication terminal having an antenna, a phone duplexer, and a TV tuner, the apparatus comprising:an LC parallel circuit, connected between the antenna and the phone duplexer, for forming an LC resonance circuit for a call signal frequency band; an LC series circuit connected to a connection point of the LC parallel circuit and the antenna and to a DC power supply terminal; a stub for impedance matching, one terminal of which is connected between a capacitor and an inductor of the LC series circuit and the other terminal of which is connected to the TV tuner; and a path providing section for providing a path between a connection point of the stub and the TV tuner and a ground terminal in accordance with a switching control signal provided when the terminal is in a TV or call operating mode.