An antenna apparatus includes: an antenna element; and a substrate on which a low noise amplifier is mounted and on which the antenna element is disposed, wherein the substrate comprises: an input unit for inputting an electric signal into the low noise amplifier from an output terminal formed at a lower part of the antenna element; an output unit for outputting the electric signal to a transmission unit connected to a signal processing unit for processing the electric signal from the antenna element; and a signal blocking unit provided between the input unit and the output unit.