Antenna array and radar device using thereof

A radar device comprising:

• an antenna for radiating a transmission signal or receiving a receiving signal;
• a transmitter for generating the transmission signal;
• a receiver for processing the receiving signal received through the antenna;
• and
• a switcher for selecting one of the transmitter and the receiver and switching the connection to be connected to the antenna,
• wherein the antenna includes:
• at least one first antenna arranged in one direction;
• at least one second antenna spaced apart from the first antenna;
• at least one shared antenna arranged between the first antenna and the second antenna;
• a first input-output terminal connected to the first antenna;
• a second input-output terminal connected to the second antenna;
• and
• a connector including a first port connected to the first antenna, a second port connected to the second antenna, a third port connected to the shared antenna and a connecting portion connected to the first port, the second port and the third port;
• wherein a signal input to one of the first port and the second port is transmitted to the other port through a first path and a second path,
• wherein the signal passed through the first path and the second path are matched at the other port.