Abstract: A radar module using multiple polarizations according to an embodiment of the present invention comprises a transmission channel unit (Tx) including a 1-1st antenna and a 1-2nd antenna electromagnetic waves representing different for transmitting polarization characteristics; a reception channel unit (Rx) including N (where N is a natural number) reception channels including a 2-1st antenna and a 2-2nd antenna for receiving echo waves of the electromagnetic waves transmitted by the transmission channel unit to an object and reflected back from the object; and a control unit for selecting the driving mode of the transmission channel unit and the reception channel unit, wherein the 1-1st and 1-2nd antennas are configured so that the electromagnetic wave transmitted by the 1-1st antenna and the electromagnetic wave transmitted by the 1-2nd antenna represent orthogonal polarization characteristics.

Abstract: A patch antenna includes: a substrate; a first radiator disposed on the substrate and having a first shape; a second radiator disposed on the substrate while being spaced a predetermined distance apart from the first radiator, and having a second shape; and a power feeder which supplies a power feed signal to the first radiator, wherein the first radiator includes a first outer edge portion straightly formed in the horizontal direction and second outer edge portions vertically formed from both ends of the first outer edge portion.

Abstract: An array antenna includes: a first radiation body of which one end is connected to a first power supply line; a second radiation body of which one end is connected through a second power supply line connected to the other end of the first radiation body; a third radiation body of which one end is connected through a third power supply line connected to the other end of the second radiation body; and a fourth radiation body of which one end is connected through a fourth power supply line connected to the other end of the third radiation body, wherein the first and second radiation bodies are formed to be symmetrical with the third and fourth radiation bodies on the basis of the third power supply line.