Antenna device and radio broadcast receiving system

Abstract

To provide an antenna device that can be commonly used for tuners of a different power feeding system.SOLUTION: In an antenna device including an antenna element, an amplifier circuit that amplifies a signal received by the antenna element, and a constant voltage circuit that receives a DC voltage supplied from the outside and generates a power supply voltage of the amplifier circuit, the antenna device includes a first terminal (DC-IN) to which the DC voltage supplied from the outside to the constant voltage circuit can be input, and a second terminal (RF-OUT) to which the signal amplified by the amplifier circuit can be output. At least one first backflow prevention element (D1) is provided between the first terminal and the voltage input point of the voltage circuit to allow a current flowing from the first terminal toward the voltage input point of the constant voltage circuit and block the current in a reverse direction, and at least one second backflow prevention element (D2) is provided between the second terminal and the voltage input point of the constant voltage circuit to allow the current flowing from the second terminal toward the voltage input point of the constant voltage circuit and block the current in the reverse direction.SELECTED DRAWING: Figure 1

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