Title:
ANTENNA DEVICE AND SEARCH DEVICE
Document Type and Number:
Japanese Patent JP2021072532
Kind Code:
A
Abstract:
To enhance a circular polarization characteristic.SOLUTION: An antenna device in the embodiment includes at least four first to N-th circular polarization antennas arranged in a plane, and a phase adjustment circuit for adjusting phase relation of first to N-th signals transmitted from the first to N-th circular polarization antennas or first to N-th signals received by the first to N-th circular polarization antennas. The first to M-th circular polarization antennas and the (M+1)-th to N-th circular polarization antennas are arranged at positions which are symmetrical in plane. The first to N-th circular polarization antennas are rotated at different first to N-th angles with respect to a first direction parallel to the first to N-th circular polarization antennas. The phase adjustment circuit sets the phases of the first to M-th signals to the first to M-th phases corresponding to the first to M-th angles, and sets the phases of the (M+1)-th to N-th signals to the (M+1)-th to N-th phases obtained by adding a first value to the phases corresponding to the (M+1)-th to N-th angles.SELECTED DRAWING: Figure 2
Inventors:
TSUTSUMI YUKAKO
HIGAKI MAKOTO
HIGAKI MAKOTO
Application Number:
JP2019197869A
Publication Date:
May 06, 2021
Filing Date:
October 30, 2019
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
H01Q21/24; H01Q3/36; H01Q21/20
Domestic Patent References:
| JPH11234037A | 1999-08-27 | |||
| JP2020043515A | 2020-03-19 | |||
| JPS5894203A | 1983-06-04 | |||
| JP2006074191A | 2006-03-16 |
Foreign References:
| US5786793A | 1998-07-28 | |||
| US5661494A | 1997-08-26 |
Attorney, Agent or Firm:
Hiroyuki Nagai
Yukitaka Nakamura
Satoru Asakura
Takeshi Sekine
Suzuki Junsei
Yukitaka Nakamura
Satoru Asakura
Takeshi Sekine
Suzuki Junsei