Array antenna apparatus

An array antenna apparatus comprising:

• a plurality of antenna elements arranged in an array pattern;
• a reception filter configured to pass a reception signal, out of signals respectively received by the plurality of antenna elements, which falls within a desired frequency band;
• a low-noise amplifier (LNA) configured to amplify a reception signal having passed through the reception filter with low noise;
• a phase controller configured to control phase of a reception signal amplified by the LNA;
• a combining unit configured to combine a plurality of reception signals controlled to have a desired phase by the phase control unit;
• a thermally insulating container configured to house the reception filter and the LNA and insulate external heat;
• a cooling unit configured to cool to extremely-low temperature in the thermally insulating container;
• a connecting wire configured to connect between the reception filter, the reception filter, and the LNA;
• an input interface configured to input a signal supplied from the outside of the container into the inside of the container;
• and
• an output interface configured to output a signal supplied from the inside of the container into the outside of the container;
• wherein the connecting wire is formed from a superconducting material, and
• a noncontact waveguide is used for at least one of the input interface and the output interface.