| 摘要 |
<p>Disclosed is an antenna device with a configuration which can keep the deterioration of communication performance caused by strong interference waves low while using a low noise amplifier. An antenna element (10) is connected, by an SPmT switch (11), to a first system which implements complex conjugating matching to the low noise amplifier (15), and a second system which matches impedance by a plurality of matching circuits (12-1 to 12-n). The first system and second system are connected by a changeover switch (16) to a tuner (17), and the SPmT switch (11) and changeover switch (16) selectively switch between the first system and second system according to the input of the low noise amplifier (15). Due to this, deterioration of communication performance caused by strong interference waves can be kept low while using the low noise amplifier (15).</p> |
