Vehicle antenna device with side wall lens

An antenna apparatus mounted on a first vehicle, comprising:

• an array antenna that includes at least one antenna element disposed on a first surface of a substrate and that forms beams in respective directions, the directions respectively forming a plurality of angles including a first angle with respect to the first surface of the substrate and the first surface of the substrate being provided along a traveling surface of the first vehicle;
• and
• a side wall that is provided in at least a part of a periphery of the at least one antenna element and that refracts a first beam in a direction along the substrate, the first beam being in a direction forming the first angle, wherein
• the array antenna forms the first beam for communicating with a first radio communication apparatus mounted on a second vehicle positioned in the direction along the substrate, and
• the array antenna forms a second beam in a direction forming a second angle different from the first angle for communicating with a second radio communication apparatus positioned in different direction than the direction of the first radio communication apparatus along the substrate, a position of the second radio communication apparatus being higher than a position of the antenna apparatus.