Antenna array and radar device using thereof
The present disclosure provides the antenna array and the radar device including 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, and wherein the signal passed through the first path and the second path are matched at the other port. According to the present disclosure, it is possible to provide the antenna array and the radar device that can be efficiently disposed in a limited space to maximize spatial advantage.
1. An antenna array comprising:
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.
2. The antenna array of claim 1 , wherein a phase of the signal transmitted to the other port through the first path and a phase of the signal transmitted to the other port through the second path are in opposite phases.
3. The antenna array of claim 1 , wherein the difference between the length of the first path and the length of the second path is one-half of a wavelength of the signal.
4. The antenna array of claim 1 , wherein the third port is connected to the first path, and the length between the first port and the third port in the first path is equal to the length between the second port and the third port.
5. The antenna array of claim 1 , wherein the third port is connected to the first port,
wherein a signal input to one of the first port and the second port is transmitted to the third port through a path between the one port to which the signal is input and the third port among the first path, and is transmitted to the third port through the second path and a path between the other port and the third port among the first path, and
wherein a phase of the signal transmitted through the path between the one port to which the signal is input and the third port is equal to a phase of a signal transmitted through the second path and a path between the other port and the third port among the first path.
6. The antenna array of claim 1 , wherein the third port is connected to the first port,
wherein a signal input to the third port is transmitted to one port of the first port and the second port through a part of the first path, and is transmitted to the one port through the rest of the first path and the second path, and
wherein the phase of the signal transmitted through the part of the first path is the same as the phase of the signal transmitted through the rest of the first path and the second path.
7. The antenna array of claim 1 , wherein the at least one first antenna and the at least one second antenna are symmetrically disposed with respect to the at least one shared antenna.
8. The antenna array of claim 1 , wherein the first antenna, the second antenna, the shared antenna and the connector are mounted on the same plane.
9. 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.
10. The radar device of claim 9 , wherein a phase of the signal transmitted to the other port through the first path and a phase of the signal transmitted to the other port through the second path are in opposite phases.
11. The radar device of claim 9 , wherein the difference between the length of the first path and the length of the second path is one-half of a wavelength of the signal.
12. The radar device of claim 9 , wherein the third port is connected to the first path, and the length between the first port and the third port in the first path is equal to the length between the second port and the third port.
13. The radar device of claim 9 , wherein the at least one first antenna and the at least one second antenna are symmetrically disposed with respect to the at least one shared antenna.
14. The radar device of claim 9 , wherein the first antenna, the second antenna, the shared antenna and the connector are mounted on the same plane.