ANTENNA DEVICE

• Main Authors: NATSUHARA KEIICHI, ITAGAKI KENJI, SHANG ERHAO, NORO TAKANORI
• Format: Patent
• Language: English; Japanese
• Published: 15.12.2022
• Subjects: ANTENNAS, i.e. RADIO AERIALS; BASIC ELECTRIC ELEMENTS; ELECTRICITY

To perform omnidirectional beam scanning without requiring a phase shifter.SOLUTION: A plane wave generating part 2 has: a probe 28 which emits an electromagnetic wave; and a main reflector 26 and a sub-reflector 27 forming a Cassegrain structure which converts the cylindrical electromagnetic wave emitted from the probe 28 into a plane electromagnetic wave. An antenna part 3 has a feed array 31 comprising: a tabular base part 311; and a plurality of radiating stubs 312 which are formed on the base part 311 as slots continuous in a linear shape, and which are arranged in parallel to one another while being spaced apart at equal intervals. The plane wave generating part 2 and the antenna part 3 are rotated together by a first rotation part with the probe 28 serving as the center of rotation so that beam scanning in an azimuth angle direction may be performed. At the same time, the antenna part 3 is rotated with respect to the plane wave generating part 2 by a second rotation part with the probe 28 serving as the center of rotation. As a result, a wavefront of the plane electromagnetic wave to be incident on the base part 311 of the antenna part 3 is tilted so that beam scanning in an altitude angle direction may be performed.SELECTED DRAWING: Figure 1 【課題】移相器を必要とすることなく全方向のビームを走査する。【解決手段】平面波発生部２が、電磁波を放射するプローブ２８と、プローブ２８から放射される円筒波の電磁波を平面波の電磁波に変換するカセグレン構造を構成する主反射鏡２６および副反射鏡２７と、を有し、アンテナ部３が、板状の基部３１１と、基部３１１において列状に連なるスロットとして形成されて相互に等間隔で離間しつつ平行に配設される複数の放射スタブ３１２と、を備えるフィードアレイ３１を有し、第１の回動部によりプローブ２８を回転中心として平面波発生部２とアンテナ部３とを一緒に回転させることによって方位角方向のビーム走査を行うとともに、第２の回動部によりプローブ２８を回転中心として平面波発生部２に対してアンテナ部３を回転させてアンテナ部３の基部３１１へと入射される平面波の電磁波の波面を傾斜させることによって高度角方向のビーム走査を行う。【選択図】図１