Antenna device and radar apparatus
An antenna device includes a transmitting antenna including a transmission channel, a transmitting antenna including a transmission channel, a transmitting antenna including a transmission channel, a transmitting antenna including a transmission channel, and a receiving antenna including reception channels. An interval between the transmitting antenna and the transmitting antenna is wider than an overall width of the receiving antenna. An interval between the transmitting antenna and the transmitting antenna is narrower than an interval between adjacent channels among the reception channels.
1. An antenna device comprising:
a transmitting antenna including a plurality of transmission channels; and
a receiving antenna including a plurality of reception channels, wherein
the transmitting antenna includes first, second, third, and fourth transmitting antennas,
an interval between the first transmitting antenna and the second transmitting antenna is wider than an overall width of the receiving antenna, and
an interval in a first direction between the third transmitting antenna and the fourth transmitting antenna is narrower than an interval in the first direction between adjacent channels among the plurality of the reception channels, wherein the first and second transmitting antennas and the receiving antenna are separated from each other in the first direction and are in a same position with each other in a second direction orthogonal to the first direction.
2. The antenna device according to claim 1 , wherein
the transmitting antenna operates using a pair of the first transmitting antenna and the second transmitting antenna in a first operation mode, and operates using a pair of the third transmitting antenna and the fourth transmitting antenna in a second operation mode.
3. The antenna device according to claim 2 , wherein
in the first and second operation modes, a part or all of the plurality of the reception channels included in the receiving antenna are shared.
4. The antenna device according to claim 1 , wherein
the first transmitting antenna and the second transmitting antenna are alternately switched by time division, and the third transmitting antenna and the fourth transmitting antenna are alternately switched by time division at a timing different from the first transmitting antenna and the second transmitting antenna.
5. The antenna device according to claim 2 , wherein
the first operation mode is a high resolution mode having a first observable angular range and a first available angular resolution,
the second operation mode is a wide angle mode having a second available angular resolution and a second observable angular range,
the first observable angular range being narrower than the second observable angular range, and
the first available angular resolution being higher than the second available angular resolution.
6. The antenna device according to claim 1 , wherein
the transmitting antenna includes first, second, third, and fourth transmission channels,
the first and second transmission channels operate as the first transmitting antenna,
the third and fourth transmission channels operate as the second transmitting antenna,
the first transmission channel operates as the third transmitting antenna, and
the second transmission channel operates as the fourth transmitting antenna.
7. The antenna device according to claim 1 , wherein
the transmitting antenna includes first, second, third, and fourth transmission channels,
the first and second transmission channels operate as the first transmitting antenna,
the third and fourth transmission channels operate as the second transmitting antenna,
the third transmission channel operates as the third transmitting antenna, and
the fourth transmission channel operates as the fourth transmitting antenna.
8. The antenna device according to claim 1 , wherein
the transmitting antenna includes first, second, third, fourth, fifth, sixth, seventh, and eighth transmission channels,
the plurality of the reception channels are arranged along a first direction,
a pair of the first and third transmission channels, a pair of the second and fourth transmission channels, a pair of the fifth and seventh transmission channels, and a pair of the sixth and eighth transmission channels are arranged along the first direction,
the first and third transmission channels are arranged along a second direction orthogonal to the first direction, and positions of the first and third transmission channels coincide with each other on an axis of the first direction,
the second and fourth transmission channels are arranged along the second direction, and positions of the second and fourth transmission channels coincide with each other on the axis of the first direction,
the fifth and seventh transmission channels are arranged along the second direction, and positions of the fifth and seventh transmission channels coincide with each other on the axis of the first direction,
the sixth and eighth transmission channels are arranged along the second direction, and positions of the sixth and eighth transmission channels coincide with each other on the axis of the first direction,
the first, second, third, and fourth transmission channels operate as the first transmitting antenna,
the fifth, sixth, seventh, and eighth transmission channels operate as the second transmitting antenna,
the first and third transmission channels operate as the third transmitting antenna, and
the second and fourth transmission channels operate as the fourth transmitting antenna.
9. The antenna device according to claim 1 , wherein
the transmitting antenna includes first, second, third, fourth, fifth, sixth, seventh, and eighth transmission channels,
the plurality of the reception channels are arranged along a first direction,
a pair of the first and third transmission channels, a pair of the second and fourth transmission channels, a pair of the fifth and seventh transmission channels, and a pair of the sixth and eighth transmission channels are arranged along the first direction,
the first and third transmission channels are arranged along a second direction orthogonal to the first direction, and positions of the first and third transmission channels coincide with each other on an axis of the first direction,
the second and fourth transmission channels are arranged along the second direction, and positions of the second and fourth transmission channels coincide with each other on the axis of the first direction,
the fifth and seventh transmission channels are arranged along the second direction, and positions of the fifth and seventh transmission channels coincide with each other on the axis of the first direction,
the sixth and eighth transmission channels are arranged along the second direction, and positions of the sixth and eighth transmission channels coincide with each other on the axis of the first direction,
the first, second, third, and fourth transmission channels operate as the first transmitting antenna,
the fifth, sixth, seventh, and eighth transmission channels operate as the second transmitting antenna,
the fifth and seventh transmission channels operate as the third transmitting antenna, and
the sixth and eighth transmission channels operate as the fourth transmitting antenna.
10. The antenna device according to claim 8 , wherein
at least one ninth transmission channel is arranged on at least one of a positive side and a negative side in the second direction in which a pair of the first and second transmission channels and a pair of the third and fourth transmission channels are arranged,
at least one tenth transmission channel is arranged on at least one of the positive side and the negative side in the second direction in which a pair of the fifth and sixth transmission channels and a pair of the seventh and eighth transmission channels are arranged, and
in the first operation mode,
the ninth transmission channel radiates a radio wave simultaneously with the first, second, third, and fourth transmission channels, and
the tenth transmission channel radiates a radio wave simultaneously with the fifth, sixth, seventh, and eighth transmission channels.
11. The antenna device according to claim 10 , wherein
a transmitter is connected to each of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth transmission channels, and
the transmitter includes a phase shifter.
12. The antenna device according to claim 11 , comprising one or a plurality of integrated circuits, wherein
a plurality of the transmitters are installed on each of the integrated circuits.
13. The antenna device according to claim 11 , comprising a plurality of integrated circuits, wherein
one or a plurality of the transmitters are installed on each of the integrated circuits, and
a plurality of the transmission channels are operated in at least the first operation mode by turn-on and off on a per integrated circuit basis.
14. The antenna device according to claim 1 , wherein
the interval between the third transmitting antenna and the fourth transmitting antenna is one-half the interval between adjacent channels among the plurality of the reception channels.
15. A radar apparatus comprising the antenna device according to claim 1 .
16. The radar apparatus according to claim 15 , comprising a signal processor to generate transmission control information including phase shift information and transmission output information corresponding to each of first and second operation modes.
17. The antenna device according to claim 9 , wherein
at least one ninth transmission channel is arranged on at least one of a positive side and a negative side in the second direction in which a pair of the first and second transmission channels and a pair of the third and fourth transmission channels are arranged,
at least one tenth transmission channel is arranged on at least one of the positive side and the negative side in the second direction in which a pair of the fifth and sixth transmission channels and a pair of the seventh and eighth transmission channels are arranged, and
in the first operation mode,
the ninth transmission channel radiates a radio wave simultaneously with the first, second, third, and fourth transmission channels, and
the tenth transmission channel radiates a radio wave simultaneously with the fifth, sixth, seventh, and eighth transmission channels.
18. The antenna device according to claim 17 , wherein
a transmitter is connected to each of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth transmission channels, and
the transmitter includes a phase shifter.
19. The antenna device according to claim 18 , comprising one or a plurality of integrated circuits, wherein
a plurality of the transmitters are installed on each of the integrated circuits.
20. The antenna device according to claim 18 , comprising a plurality of integrated circuits, wherein
one or a plurality of the transmitters are installed on each of the integrated circuits, and
a plurality of the transmission channels are operated in at least the first operation mode by turn-on and off on a per integrated circuit basis.
21. The antenna device according to claim 1 , wherein
the first transmitting antenna includes a plurality of first element antennas connected to a first feeding point via a first line and configured to radiate a first signal applied to the first feeding point, the first element antennas being aligned with each other in the first direction and separated from each other in a second direction orthogonal to the first direction; and
the second transmitting antenna includes a plurality of second element antennas connected to a second feeding point via a second line and configured to radiate a second signal applied to the second feeding point, the second element antennas being aligned with each other in the first direction and separated from each other in the second direction orthogonal to the first direction.
22. The antenna device according to claim 1 , wherein
the third and fourth transmitting antennas are aligned with each other in the second direction and are offset from the first and second transmitting antennas in the second direction.