Antenna device and radar including the same
The present disclosure relates to an antenna device and a radar including the same. Specifically, the antenna device according to the present disclosure includes: at least one first antenna arranged in one direction and configured to radiate a beam tilted at a first tilt angle; at least one second antenna arranged to be spaced apart from the first antenna and configured to radiate a beam tilted at a second tilt angle; an input/output terminal disposed such that any one of a transmission signal and a reception signal moves therethrough; and a divider comprising a first port connected to the first antenna, a second port connected to the second antenna, and a third port connected to the input/output terminal, wherein the divider is disposed such that a signal transmitted to one of the first port and the second port is transmitted to a remaining one of the first and second port through a first path and a second path and the transmitted signal is isolated in the remaining port.
1. An antenna device comprising:
at least one first antenna arranged in one direction and configured to radiate a beam tilted at a first tilt angle;
at least one second antenna arranged to be spaced apart from the first antenna and configured to radiate a beam tilted at a second tilt angle;
an input/output terminal disposed such that any one of a transmission signal and a reception signal moves therethrough; and
a circuit comprising a first port connected to the first antenna, a second port connected to the second antenna, and a third port connected to the input/output terminal, wherein the circuit is disposed such that a signal transmitted to one of the first port and the second port is transmitted to a remaining one of the first and second ports through a first path and a second path and the transmitted signal is isolated in a remaining one of the first and second ports.
2. The antenna device of claim 1 , wherein a phase of a signal transmitted to the remaining one of the first and second ports through the first path and a phase of a signal transmitted to the remaining one of the first and second ports through the second path are in a reverse relation.
3. The antenna device of claim 1 , wherein a difference between a length of the first path and a length of the second path is ½ of a wavelength of the signal.
4. The antenna device of claim 1 , wherein the at least one first antenna and the at least one second antenna are symmetrical to each other with respect to the circuit.
5. The antenna device of claim 1 , wherein, when the length of the first path is longer than the length of the second path by ½ of the wavelength of the signal, the third port is connected to the first path,
a signal transmitted to the third port is transmitted to one of the first port and the second port through a portion of the first path, and is transmitted to the one of the first port and the second port through a remaining portion of the first path and the second path, and
a phase of the signal transmitted to the one of the first and second ports through the portion of the first path and a phase of a signal transmitted to the one of the first and second ports through the remaining portion of the first path and the second path are equal to each other.
6. The antenna device of claim 1 , wherein, when the length of the first path is longer than the length of the second path by ½ of the wavelength of the signal, the third port is connected to the first path,
a phase of a signal transmitted to the third port so as to be transmitted to one of the first port and the second port, and a phase of a signal transmitted to the third port so as to be transmitted to a remaining one of the first port and the second port are in a reverse relation.
7. The antenna device of claim 1 , wherein, when the length of the first path is longer than the length of the second path by ½ of the wavelength of the signal, the third port is connected to the first path,
a signal transmitted to one of the first port and the second port is transmitted to the third port through a path between the one of the first and second ports in the first path and the third port and is transmitted to the third port through a path between the remaining one of the first and second ports in the first path and the third port and the second path, and
the phase of the signal transmitted to the third port through the path between the one of the first and second ports in the first path and the third port and the phase of the signal transmitted to the third port through the path between the remaining one of the first and second ports in the first path and the third port and the second path are equal to each other.
8. The antenna device of claim 1 , wherein, when the length of the first path is longer than the length of the second path by ½ of the wavelength of the signal, the third port is connected to the first path, and
a phase of a signal when transmitted from one of the first port and the second port to the third port and a phase of a signal when transmitted from the remaining one of the first port and the second port to the third port are in a reverse relation.
9. A radar comprising:
a transmission signal generator configured to generate a transmission signal;
a reception signal processor configured to process a reception signal received from an antenna; and
an antenna unit configured to transmit the transmission signal or to receive the reception signal,
wherein the antenna unit comprises:
at least one first antenna arranged in one direction and configured to radiate a beam tilted at a first tilt angle;
at least one second antenna arranged to be spaced apart from the first antenna and configured to radiate a beam tilted at a second tilt angle;
an input/output terminal disposed such that any one of a transmission signal and a reception signal moves therethrough; and
a circuit comprising a first port connected to the first antenna, a second port connected to the second antenna, and a third port connected to the input/output terminal, wherein the circuit is disposed such that a signal transmitted to one of the first port and the second port is transmitted to a remaining one of the first and second ports through a first path and a second path and the transmitted signal is isolated in the remaining one of the first and second ports.
10. A radar comprising:
a transmission signal generator configured to generate a transmission signal;
a transmission antenna unit configured to transmit the transmission signal received from the transmission signal generator;
a reception antenna unit configured to receive a reception signal; and
a reception signal processor configured to process the reception signal received from the reception antenna unit;
wherein the transmission antenna unit comprises:
at least one first antenna arranged in one direction and configured to radiate a beam tilted at a first tilt angle;
at least one second antenna arranged to be spaced apart from the first antenna and configured to radiate a beam tilted at a second tilt angle;
an input/output terminal disposed such that the transmission signal moves therethrough; and
a circuit comprising a first port connected to the first antenna, a second port connected to the second antenna, and a third port connected to the input/output terminal, wherein the circuit is disposed such that a signal transmitted to one of the first port and the second port is transmitted to a remaining one of the first and second ports through a first path and a second path and the transmitted signal is isolated in the remaining one of the first and second ports.