| 摘要 |
A high frequency signal is inputted to a receiver from an antenna for receiving the high frequency signal. The receiver is provided with: an amplifier element for amplifying the inputted high frequency signal; n (n: natural number not less than 2) pieces of coil elements, which are serially connected between the antenna and an input side of the amplifier element and construct a low pass filter for the inputted high frequency signal; and an AGC circuit including an impedance variable device, which is connected at one end thereof to an intermediate connection point of two coil elements adjacently disposed in the n pieces of coil elements and is connected at the other end thereof to a ground, and which impedance between one end and the other end is varied in accordance with a level of the inputted high frequency signal, for controlling an input level of the inputted high frequency signal for the amplifier element by changing an attenuation characteristic thereof in accordance with the change in the impedance of the impedance variable device.
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