Radar apparatus, and transmission and reception method

A radar apparatus comprising:

• first antennas arranged in a first plane and configured to form a minimum redundancy array;
• and
• a second antenna, wherein
• if the first antennas are used as transmission antennas, the second antenna is used as a reception antenna,
• if the second antenna is used as a transmission antenna, the first antennas are used as reception antennas,
• the first antennas are arranged in a first direction and in a second direction crossing the first direction,
• distances between adjacent two of the first antennas arranged in the first direction are not the same, the distances including a third distance which is a minimum distance between adjacent two of the first antennas arranged in the first direction, and a positive integer multiple of the third distance, and
• distances between adjacent two of the first antennas arranged in the second direction are not the same, the distances including a fourth distance which is a minimum distance between adjacent two of the first antennas arranged in the second direction, and a positive integer multiple of the fourth distance.

A radar apparatus, comprising:

• first antennas arranged in a first plane;
• and
• second antennas arranged in a second plane, wherein
• if the first antennas are used as transmission antennas, the second antennas are used as reception antennas,
• if the second antennas are used as the transmission antennas, the first antennas are used as the reception antennas,
• the first plane and the second plane are included in a single plane or two planes parallel to each other,
• the first antennas are arranged in a first quadrilateral region defined by a first size in a first direction and a second size in a second direction,
• the second antennas are arranged in the first direction at a first distance and a second distance and in the second direction at a third distance and a fourth distance,
• the first distance is the first size,
• the second distance includes a distance of a positive integer multiple of the first distance,
• the third distance is the second size, and
• the fourth distance includes a distance of a positive integer multiple of the third distance.

A transmission and reception method with a radar apparatus comprising:

• first antennas arranged in a first plane;
• a second antenna arranged in a second plane;
• and
• a third antenna arranged in a third plane, wherein
• the first plane, the second plane, and the third plane are included in a single plane or two planes which are parallel to each other,
• the first antennas are arranged within a first quadrilateral region defined by a first size in a first direction and a second size in a second direction, and arranged in the first direction at a first distance and in the second direction at a second distance,
• a distance between the second antenna and the third antenna in the first direction is approximately equal to the first size, the method comprising:
• transmitting radio waves by the first antennas and receiving radio waves by the second antenna and the third antenna;
• and
• transmitting radio waves by the second antenna and the third antenna and receiving radio waves by the first antennas.