RADAR ANTENNA

To provide a radar antenna capable of obtaining vertical surface directivity without providing a flare and of obtaining desired sidelobe level characteristics.SOLUTION: A radar antenna comprises: a plurality of waveguides 2 whose cross section is a substantially rectangular cylindrical shape and on whose front surface part a slot 2a is formed; and band plate-like horizontal plate parts 4 protruded substantially horizontally from at least an upper edge side of the uppermost waveguide 2 and a lower edge side of the lowermost waveguide 2 toward a front face side and extended in a longitudinal direction of the waveguides 2 in a state where the plurality of waveguides 2 are arranged vertically so as to be extended substantially horizontally. A length in the substantially horizontal direction of the lowermost horizontal plate part 4 is set to be longer than that of the other horizontal plate part 4.SELECTED DRAWING: Figure 1 【課題】フレアを備えずに垂直面指向性が得られ、かつ、所望のサイドローブレベル特性が得られるレーダアンテナを提供する。【解決手段】断面が略四角形の筒状で前面部にスロット２ａが形成された複数の導波管２と、複数の導波管２が略水平に延びて上下に配設された状態で、少なくとも最上位の導波管２の上縁側および最下位の導波管２の下縁側から略水平に前面側に突出し、導波管２の長手方向に沿って延びる帯板状の水平板部４と、を備え、最下位の水平板部４の略水平方向の長さは、他の水平板部４の略水平方向の長さよりも長く設定されている。【選択図】図１