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    • 1. 发明公开
    • AN ANTENNA FOR A RADAR APPARATUS
    • EP4243205A1
    • 2023-09-13
    • EP22161037.1
    • 2022-03-09
    • Vaisala, OYJ
    • KERÄNEN, ReinoBERG, MarkusTUOVINEN, TommiJUNTTILA, JanneKIVIJÄRVI, AnttiSIROLA, JukkaHAUTANIEMI, Petri
    • H01Q1/52H01Q5/45H01Q15/00H01Q19/06H01Q19/10
    • According to an example embodiment, an antenna assembly (110) for a radar apparatus (100) is provided, the antenna assembly comprising: a first feed antenna (111a) arranged to transmit outbound radio waves of a transmitter beam (113a) based on a transmitted RF signal supplied thereto and a second feed antenna (111b) arranged to capture a received RF signal based on inbound radio waves of a receiver beam (113b) received thereat; and a lens element (112) arranged to collimate the transmitter beam (113a) obtained via a back end of the lens element (112) for transmission from a front end of the lens element (112) to a monitoring direction and to focus the receiver beam (113b) received at the front end of the lens element (112) from the monitoring direction for reception via the back end of the lens element (112) at the second feed antenna (111b), wherein the first and second feed antennas (111a, 111b) are disposed on a conductive ground plane (115) that is offset from the back end of the lens element (112) by a predefined distance (k) in direction of a center axis (A) of the lens element (112), and wherein a volume between the back end of the lens element (112) and the ground plane (115) comprises material that has a refractive index that is smaller than that of the lens element (112) for converging the outbound and inbound RF beams between the back end of the lens element (112) and the first and second feed antennas (111a, 111b).
    • 7. 发明公开
    • SATELLITE MULTIBAND ANTENNA UNIT
    • 卫星多频天线单元
    • EP3183775A1
    • 2017-06-28
    • EP14830538.6
    • 2014-08-22
    • Eutelsat SA
    • LOHREY, ThomasBREITSAMETER, KlausSTRAUSS, Georg Emanuel August
    • H01Q15/00H01Q19/17H01Q19/19H01Q19/13H01Q5/45
    • H01Q19/132H01Q5/45H01Q15/0026H01Q15/0033H01Q19/17H01Q19/192
    • The invention relates to a satellite multi-band antenna unit comprising a main reflector; a frequency selective reflective unit; a first feed connected to a first low noise down converter, said first feed being located in a first location for receiving radiation in a first frequency band, said radiation in the first frequency band comprising a plurality of incident beams reflected from said main reflector and transmitted through said frequency selective reflective unit; a second feed connected to a second low noise down converter, said second feed being located in a second location for receiving radiation in a second frequency band lower than said first frequency band, said radiation in the second frequency band comprising a plurality of incident beams reflected from said main reflector and from said frequency selective unit; and a transmitter connected to one of said first or second feed for transmitting uplink radiation to said main reflector. Said frequency selective reflective unit comprises at least two electrically conductive plates (30') facing each other, each plate having an array of spaced apart apertures (31 '). The spaced apart apertures (31') of each plate have inner dimensions (Ax1 increasing with an angle of the incident beams.
    • 本发明涉及一种卫星多频带天线单元,其包括主反射器; 频率选择性反射单元; 连接到第一低噪声降频转换器的第一馈源,所述第一馈源位于第一位置,用于接收第一频带中的辐射,所述第一频带中的所述辐射包括从所述主反射器反射的多个入射光束并被传输 通过所述频率选择反射单元; 连接到第二低噪声下变频器的第二馈源,所述第二馈源位于第二位置,用于接收低于所述第一频段的第二频段的辐射,所述第二频段的辐射包括反射的多个入射光束 来自所述主反射器和来自所述频率选择单元; 以及连接到所述第一或第二馈源中的一个以将上行辐射传输到所述主反射器的发射器。 所述频率选择性反射单元包括至少两个彼此面对的导电板(30'),每个板具有间隔开的孔(31')的阵列。 每个板的间隔开的孔(31')具有内部尺寸(Ax1随着入射光束的角度而增加。