公开(公告)号：US6020850A

公开(公告)日：2000-02-01

申请号：US916664

申请日：1997-08-22

申请人： Yu Ji ,  Keizo Inagaki ,  Nobuaki Imai ,  Yoshio Karasawa

发明人： Yu Ji ,  Keizo Inagaki ,  Nobuaki Imai ,  Yoshio Karasawa

IPC分类号： H01Q19/00 ,  H01Q3/26 ,  H01Q3/30 ,  H01Q21/00 ,  H01Q25/00 ,  H01Q3/02 ,  H01Q3/12

CPC分类号： H01Q3/2676

摘要： Disclosed is an optical control type phased array antenna apparatus having an array antenna of antenna elements. An optical signal processor optically processes input high-frequency signals, and outputs optically processed signals including signal components having phases corresponding to directions in which radio wave signals come and having frequencies equal to those of the input high-frequency signals. Then, each frequency converter mixes a received signal with the optically processed signal in correspondence with the antenna element, and outputs a frequency-converted signal having a frequency of a difference between a frequency of the received signal and a frequency of the optically processed signal. Further, a combiner combines the frequency-converted signals. When reference signals each having a frequency that differs from the frequency of the corresponding radio wave signal by an intermediate frequency are inputted to the optical signal processor as the input high-frequency signals, intermediate frequency signals having the intermediate frequencies and corresponding to the radio wave signals are outputted as received signals from the combiner.

摘要翻译： 公开了一种具有天线元件阵列天线的光控制型相控阵天线装置。 光信号处理器光学处理输入的高频信号，并且输出光学处理的信号，该信号包括信号分量，该信号分量具有与无线电波信号所来的方向相对应的相位，其频率等于输入的高频信号的频率。 然后，每个变频器将接收到的信号与天线元件对应的光学处理信号混合，并输出具有接收信号的频率与光学处理信号的频率之间的差的频率的频率转换信号。 此外，组合器组合频率转换信号。 当将具有与中频对应的无线电波信号的频率不同的参考信号作为输入高频信号输入到光信号处理器时，具有中频并对应于无线电波的中频信号 信号作为来自组合器的接收信号输出。

公开(公告)号：US5868953A

公开(公告)日：1999-02-09

申请号：US551126

申请日：1995-10-31

申请人： Masashi Maekawa ,  Nobuo Kawasaki ,  Yasuyuki Kawashima ,  Yoshio Karasawa

发明人： Masashi Maekawa ,  Nobuo Kawasaki ,  Yasuyuki Kawashima ,  Yoshio Karasawa

IPC分类号： B24B37/00 ,  C03C10/00 ,  C03C10/14 ,  C03C19/00 ,  C09K3/14 ,  G11B5/73 ,  G11B5/82 ,  G11B5/84 ,  B44C1/22

CPC分类号： G11B5/8404 ,  C03C10/0009 ,  C03C19/00 ,  C09K3/1409

摘要： A method for manufacturing a magnetic disk substrate includes a step of polishing a glass-ceramic having a crystal phase consisting of crystal grains having an average diameter of less than 3 .mu.m with a polishing material having a grain diameter smaller than the diameter of the crystal grain. In one aspect of the invention, the glass-ceramic includes lithium disilicate (Li.sub.2 O--2SiO.sub.2) and alpha-quartz (alpha-SiO.sub.2) as predominant crystal phases and grown crystal grains of the alpha-quartz each have a globular grain structure consisting of aggregated particles and have a diameter within a range of 0.3 .mu.m-3.0 .mu.m.

摘要翻译： 一种磁盘基板的制造方法，其特征在于，使用具有比晶体直径小的研磨材料研磨具有平均粒径小于3μm的结晶相的结晶相的玻璃陶瓷的工序 粮食。 在本发明的一个方面，玻璃陶瓷包括二硅酸锂（Li 2 O-2SiO 2）和α-石英（α-SiO 2）作为主要结晶相，并且α-石英的生长晶粒各自具有由聚集的 颗粒，直径在0.3μm-3.0μm的范围内。

公开(公告)号：US5722042A

公开(公告)日：1998-02-24

申请号：US541268

申请日：1995-10-12

申请人： Kazuhiro Kimura ,  Yoshio Karasawa

发明人： Kazuhiro Kimura ,  Yoshio Karasawa

IPC分类号： H04B7/15 ,  H04B7/185 ,  H04B7/195

CPC分类号： H04B7/195

摘要： A satellite communication system has a double-layered earth orbit satellite constellation with a lower first orbit altitude and a higher second orbit altitude. In the satellite communication system, first and second communication satellites are deployed in respective earth orbits located at the first and second orbit altitudes to each have first and second satellite communication stations, respectively. Small terminals and large terminals are further provided as earth stations on the earth. Each first satellite communication station communicates with the small terminals and communicates with the first satellite communication stations of adjacent first communication satellites within the same earth orbit and the second satellite communication stations, and each second satellite communication station communicates with the large terminals and communicates with the second satellite communication stations of adjacent communication satellites within the same earth orbit, the second satellite communication stations of the second communication satellites of both adjacent earth orbits, and the first satellite communication stations.

摘要翻译： 卫星通信系统具有双层地球轨道卫星星座，具有较低的第一轨道高度和较高的第二轨道高度。 在卫星通信系统中，第一和第二通信卫星部署在位于第一和第二轨道高度的相应地球轨道中，分别具有第一和第二卫星通信站。 进一步提供小型终端和大型终端作为地球上的地球站。 每个第一卫星通信站与小型终端进行通信，并与相同地球轨道内的相邻第一通信卫星的第一卫星通信站和第二卫星通信站进行通信，并且每个第二卫星通信站与大型终端进行通信，并与 相同地球轨道内的相邻通信卫星的第二卫星通信站，相邻地球轨道的第二通信卫星的第二卫星通信站和第一卫星通信站。