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公开(公告)号：US5374934A
公开(公告)日：1994-12-20
申请号：US848325
申请日：1992-03-09
CPC分类号： G01B15/04
摘要： A positioner supports an antenna at an optional rotating angle and the mirror surface of the antenna at different rotating angles is measured. A computer expands the measured value into series using polar coordinates system associated with the measuring system, whereby the intrinsic deformation of the mirror surface under the zero-gravity condition and the deformation due to gravity are separately measured.
摘要翻译： 定位器以可选的旋转角度支撑天线，并测量天线的不同旋转角度的镜面。 计算机使用与测量系统相关联的极坐标系统将测量值扩展成串联，由此分别测量零重力条件下的镜面在零重力条件下的固有变形和由重力引起的变形。
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公开(公告)号：US4356494A
公开(公告)日：1982-10-26
申请号：US227902
申请日：1981-01-23
申请人： Takashi Katagi , Shuji Urasaki , Takashi Ebisui , Katsuhiko Aoki
发明人： Takashi Katagi , Shuji Urasaki , Takashi Ebisui , Katsuhiko Aoki
CPC分类号： H01Q19/19
摘要： 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.
摘要翻译： 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。
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3.发明授权
公开(公告)号：US4792814A
公开(公告)日：1988-12-20
申请号：US78669
申请日：1987-07-28
申请人： Takashi Ebisui
发明人： Takashi Ebisui
CPC分类号： H01Q13/025
摘要： A conical horn antenna applicable to plural modes of electromagnetic waves is substantially composed of a feed waveguide positioned on the base end side and feeding a dominant mode of an electromagnetic wave, a conical horn positioned on the fore end side and radiating electromagnetic waves of plural modes including dominant and higher modes, and a desired mode of electromagnetic wave generating portion provided between the feed waveguide and the conical horn and generating an electromagnetic wave of a desired higher mode. The electromagnetic wave generating portion is composed of straight cylindrical waveguides having the same or different inside diameters and having a predetermined relation to the wavelength of maximum frequency and that of minimum frequency in a certain frequency band, and tapered waveguides which connect stages of said straight cylindrical waveguides, a feed waveguide and a conical horn, respectively, through truncated cone-like inner peripheral surfaces thereof and which expand forwardly from the base end side. The tapered waveguide adjacent to the feed waveguide may be constructed of two tapered portions having a gentle expansion angle on the base end side and a sharp expansion angle on the fore end side. n
摘要翻译： 可应用于多种电磁波的圆锥形喇叭天线基本上由位于基端侧的馈电波导和馈送电磁波的主要模式，位于前端侧的锥形喇叭和辐射多个模式的电磁波组成 包括主导和更高模式，以及设置在馈电波导和锥形喇叭之间的电磁波产生部分的期望模式，并产生所需更高模式的电磁波。 电磁波产生部分由具有相同或不同内径的直的圆柱形波导组成，并且在一定频带内具有与最大频率波长和最小频率波长有关的预定关系;以及锥形波导，其连接所述直圆柱形 波导，馈电波导和锥形喇叭，分别通过截头圆锥状的内周表面并从基端侧向前扩展。 与馈电波导相邻的锥形波导可以由在基端侧具有温和的膨胀角的两个锥形部分和在前端侧上的尖锐的扩展角构成。
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