| 摘要 |
PURPOSE: An antenna matching circuit is provided to be capable of preventing an interference between two signals at a mobile communication terminal using a dual band antenna. CONSTITUTION: Common matching parts(202,203) are connected in series between a feeder(201) connected to an antenna and a radio frequency circuit of a mobile communication system and are impedance matched in common with high-frequency and low-frequency signals. A diplexer(204) is connected in parallel with the common matching parts and separates the high-frequency and low-frequency signals to output the separated signals to serial and parallel output ports. A high-frequency matching circuit(206) performs a matching operation of the high-frequency signal between a high-frequency output terminal of the diplexer and a ground. A low-frequency matching circuit(205) performs a matching operation of the low-frequency signal between a low-frequency output terminal of the diplexer and the ground.
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