| 摘要 |
PURPOSE: An antenna for a vehicle is provided to control not only a strong field signal but also a weak electric field signal adjacent to the strong electric field by improving an AGC(Automatic Gain Control) of an amplifier module. CONSTITUTION: An antenna for a vehicle includes a first AGC unit(400) and a second AGC unit(500). The first AGC unit outputs the attenuated signal to a transistor after performing the attenuation by determining the intensity of an input signal which does not pass through the transistor in an amplifier input terminal. The second AGC unit outputs the input signal coupled with the transformer and the transistor by controlling the power supplied to the transistor when an input signal above a reference signal is inputted in the amplifier input terminal.
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