PROBLEM TO BE SOLVED: To provide a technology for suppressing a disorder in the radiation characteristic of an antenna disposed in a bumper.SOLUTION: An antenna (11) includes N (N denotes an integer equal to or larger than 2) antenna elements which are equidistantly disposed in line and to which signals that are in phase with one another are fed. A radome (12) is opposed to the radiating surface of the antenna. The radome is shaped so that a radiation emanating from the k-th (k denotes any of 1 to N) antenna element included in the antenna passes through a region having a thickness of D+(k-1)d. Assuming that the phase of a direct wave that directly reaches the bumper from the k-th antenna element is (k-1)α and the phase of a reflected wave reaching the bumper after being reflected once from each of the bumper and the radiating surface of the antenna is β+(k-1)×3α, a parameter d determining the thickness of the radome is designated to satisfy 0
【課題】バンパ内に設置されるアンテナの放射特性の乱れを抑制する技術を提供する。【解決手段】アンテナ(11)は、等間隔に一列に配置され、同位相の信号が供給されるN(Nは2以上の整数)個のアンテナ素子で構成される。レドーム(12)は、アンテナの放射面に対向配置される。レドームは、アンテナを構成するk(k=1〜N)番目のアンテナ素子からの放射波が、厚さD+(k−1)dの部位を通過する形状に形成され、且つ、前記レドームの厚さを決めるパラメータdは、k番目のアンテナ素子から前記パンパに直接到達する直接波の位相を(k−1)α、前記バンパおよび前記アンテナの放射面で1回ずつ反射してバンパに到達する反射波の位相をβ+(k−1)×3αとして、0<Nα≦π、3Nα=2nπ(nは正整数)を満たすように設定される。【選択図】図4
ONBOARD ANTENNA UNIT AND ONBOARD RADER SYSTEM
車載アンテナ装置、車載レーダ装置
2016-06-20
Patent
Electronic Resource
Japanese
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