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    • 5. 发明授权
    • Dual reflector antenna
    • 双反射天线
    • US4356494A
    • 1982-10-26
    • US227902
    • 1981-01-23
    • Takashi KatagiShuji UrasakiTakashi EbisuiKatsuhiko Aoki
    • Takashi KatagiShuji UrasakiTakashi EbisuiKatsuhiko Aoki
    • H01Q19/18H01Q19/19
    • H01Q19/19
    • An earth station antenna is employed for telecommunicating with a satellite in combination with an automatic tracking apparatus. The antenna is a dual reflector antenna which comprises a main reflector, a sub-reflector and a primary radiator, and the used frequency band of the antenna is at least 1.8 octaves. A parameter t of the antenna, defined by a configuration of the primary radiator is less than 0.3 at the lowest operating frequency. The phase center of the primary radiator, at a low frequency within the operating frequency range, is made to correspond with the focus of the sub-reflector.The above parameter t is defined by: ##EQU1## where: .lambda.: wavelength in free space,D.sub.h : aperture diameter of the primary radiator,L.sub.h : center axial length from the radiator apex to the radiator aperture plane, andL.sub.s : length from the radiator aperture plane to the bottom surface of the sub-reflector.
    • 采用地球站天线与卫星进行通信,结合自动跟踪装置。 该天线是双反射器天线,其包括主反射器,副反射器和主辐射器,天线的使用频带为至少1.8倍。 在最低工作频率下,由主辐射器的配置限定的天线的参数t小于0.3。 初级辐射器在工作频率范围内的低频的相位中心与副反射器的焦点相对应。 上述参数t由下式定义:其中:λ:自由空间中的波长,Dh:主辐射器的孔径,Lh:从散热器顶点到散热器孔径平面的中心轴向长度,Ls:来自 散热器孔径平面到底部反射器的底面。
    • 10. 发明授权
    • Antenna system
    • 天线系统
    • US4500882A
    • 1985-02-19
    • US317847
    • 1981-11-03
    • Takashi KatagiSeiji Mano
    • Takashi KatagiSeiji Mano
    • H01Q3/26H01Q19/02H01Q3/22H01Q3/24
    • H01Q19/027H01Q3/2658
    • An antenna system includes a reflector and a primary and a subsidiary array antenna which are disposed in front of an aperture of the reflector so as to be positioned back-to-back with each other. An electric power which is supplied to the primary array antenna is also partly supplied to the subsidiary array antenna after it has been controlled in both phase and amplitude in order that a radiant beam from the subsidiary array antenna compensates for that portion of a secondary radiant beam from the reflector which is blocked by the primary array antenna. For example, a transmission source is connected to the primary array antenna through a coupler and a distributor while the coupler is connected to the subsidiary array antenna through a phase and an amplitude regulator and a distributor. The source may also be connected via the distributor to the primary array antenna formed of a plurality of radiating elements which are respectively connected to corresponding radiating elements of the subsidiary array antenna through couplers and delay lines or feeder lines.
    • 天线系统包括反射器和主阵列天线和辅助阵列天线,其布置在反射器的孔的前面,以便彼此背对背地定位。 在辅助阵列天线被控制在相位和振幅之后,提供给主阵列天线的电力也被部分地提供给辅助阵列天线,以便来自辅助阵列天线的辐射束补偿第二辐射束的那部分 从被主阵列天线阻挡的反射器。 例如,通过耦合器和分配器将发送源连接到主阵列天线,而耦合器通过相位和幅度调节器和分配器连接到辅助阵列天线。 源极还可以经由分配器连接到由多个辐射元件形成的主阵列天线,所述主阵列天线通过耦合器和延迟线或馈线分别连接到辅助阵列天线的相应辐射元件。