Antenna device and radar apparatus

An antenna device comprising:

• a receiving antenna in which a sub-array including a plurality of element antennas is formed and a plurality of the sub-arrays are arranged along a first direction;
• first and second transmission sub-array antennas and third and fourth transmission sub-array antennas that are arranged along the first direction, the first and second transmission sub-array antennas being arranged on one side of the receiving antenna and the third and fourth transmission sub-array antennas being arranged on another side of the receiving antenna;
• fifth and sixth transmission sub-array antennas and seventh and eighth transmission sub-array antennas that are arranged along the first direction, the fifth and sixth transmission sub-array antennas being arranged on one side of the receiving antenna and the seventh and eighth transmission sub-array antennas being arranged on another side of of the receiving antenna;
• ninth and tenth transmission sub-array antennas and eleventh and twelfth transmission sub-array antennas that are arranged along a second direction orthogonal to the first direction, the ninth and tenth transmission sub-array antennas being arranged on one side of the first, second, fifth, and sixth transmission sub-array antennas and the eleventh and twelfth transmission sub-array antennas being arranged on another side of the first, second, fifth, and sixth transmission sub-array antennas;
• and
• thirteenth and fourteenth transmission sub-array antennas and fifteenth and sixteenth transmission sub-array antennas that are arranged along the second direction, the thirteenth and fourteenth transmission sub-array antennas being arranged on one side of the third, fourth, seventh, and eighth transmission sub-array antennas and the fifteenth and sixteenth transmission sub-array antennas being arranged on another side of the third, fourth, seventh, and eighth transmission sub-array antennas, wherein
• the first and fifth transmission sub-array antennas are arranged in the second direction,
• the second and sixth transmission sub-array antennas are arranged in the second direction,
• the third and seventh transmission sub-array antennas are arranged in the second direction,
• the fourth and eighth transmission sub-array antennas are arranged in the second direction,
• in each of the first, second, third, and fourth transmission sub-array antennas, a plurality of element antennas are connected to a single feeding point,
• in each of the fifth, sixth, seventh, and eighth transmission sub-array antennas, a plurality of element antennas are connected to a single feeding point,
• in each of the ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, and sixteenth transmission sub-array antennas, a plurality of element antennas are connected to a single feeding point, and
• an interval between phase centers of the first and second transmission sub-array antennas, an interval between phase centers of the third and fourth transmission sub-array antennas, an interval between phase centers of the fifth and sixth transmission sub-array antennas, and an interval between phase centers of the seventh and eighth transmission sub-array antennas are each narrower than an interval between phase centers of the sub-array located on one side of the receiving antenna and the sub-array located on another side of the receiving antenna.