专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5170176A Quadrifilar helix antenna 失效
标题翻译： QUADRIFILAR HELIX天线
公开(公告)号：US5170176A
公开(公告)日：1992-12-08
申请号：US659657
申请日：1991-02-25
申请人： Masayuki Yasunaga , Takayasu Shiokawa
发明人： Masayuki Yasunaga , Takayasu Shiokawa
IPC分类号： H01Q11/08
CPC分类号： H01Q11/08
摘要： A quadrifilar helix antenna according to the present invention incorporates four helix conductors wound around an axis in the same winding direction. Each of the helix conductors has a linear conductor which is parallel to its axis at either end or both ends of the helix conductor. The present antenna reduces the effect of multipath fading due to sea-surface reflection in mobile satellite communications.
摘要翻译：根据本发明的四极螺旋天线包括绕相同卷绕方向的轴线缠绕的四个螺旋导体。每个螺旋导体具有在螺旋导体的任一端或两端平行于其轴线的线性导体。本天线减少了移动卫星通信中由于海面反射引起的多径衰落的影响。

2. 发明授权

US5173711A Microstrip antenna for two-frequency separate-feeding type for circularly polarized waves 失效
标题翻译：用于圆偏振波的双频分离馈电型微带天线
公开(公告)号：US5173711A
公开(公告)日：1992-12-22
申请号：US906030
申请日：1992-06-26
申请人： Kazunori Takeuchi , Masayuki Yasunaga , Takayasu Shiokawa
发明人： Kazunori Takeuchi , Masayuki Yasunaga , Takayasu Shiokawa
IPC分类号： H01Q5/00 , H01Q5/42 , H01Q9/04 , H01Q21/06
CPC分类号： H01Q21/065 , H01Q5/42 , H01Q9/0421
摘要： A microstrip antenna of two-frequency separate-feeding type for circularly polarized waves is disclosed, in which four radiation conductors are disposed on a dielectric plate mounted on a conducting ground plane and each radiation conductor has its marginal portion partly short-circuited via a short-circuiting conductor to the conducting ground plane and is supplied at its feeding point with power via a feeder passing through the conducting ground plane and the dielectric plate. The four radiation conductors are composed of two pairs of radiation conductors of different sizes adjusted so that two desired frequencies can simultaneously be used for transmission and for reception, respectively, the conductors of each pair being arranged to generate a circularly polarized wave.
摘要翻译：公开了一种用于圆偏振波的双频分离馈电型微带天线，其中四个辐射导体设置在安装在导电接地平面上的电介质板上，并且每个辐射导体的边缘部分经由短路部分短路电导体连接到导电接地平面，并通过馈电线通过导电接地平面和电介质板在其馈电点供电。四个辐射导体由两对不同尺寸的辐射导体对组成，这两对辐射导体被调整为使得两个所需频率分别同时用于传输和接收，每对导体被布置成产生圆偏振波。

3. 发明授权

US5493436A Optical wave transmission 失效
标题翻译：光波传输
公开(公告)号：US5493436A
公开(公告)日：1996-02-20
申请号：US408325
申请日：1995-03-21
申请人： Yoshio Karasawa , Takashi Matsudo , Hisato Iwai , Takayasu Shiokawa
发明人： Yoshio Karasawa , Takashi Matsudo , Hisato Iwai , Takayasu Shiokawa
IPC分类号： H04B10/11 , H04B7/26 , H04B10/032 , H04B10/07 , H04B10/112 , H04B10/22 , H04B10/10
CPC分类号： H04B10/1125 , H04B10/25759
摘要： A system for communicating between mobile units and an exchange station, with a radio frequency signal, in which an electric signal from a telephone exchange of the telephone station is converted into an optical signal with an electricity-to-light converter. The optical signal is carried via an optical fiber cable to a transmission communication antenna for emission, with amplification of the optical signal if necessary. The emitted signal is received by a receiving communication antenna, amplified with an optical amplifier if necessary, and converted to an electric signal with a light-to-electricity converter.
摘要翻译：一种用于在移动单元和具有射频信号的交换站之间进行通信的系统，其中来自电话台的电话交换机的电信号被转换成具有电 - 光转换器的光信号。光信号通过光纤电缆传送到用于发射的传输通信天线，如果需要则放大光信号。发射信号由接收通信天线接收，如果需要用光放大器放大，并用光 - 电转换器转换成电信号。

4. 发明授权

US4853702A Radio wave receiving system 失效
标题翻译：无线电波接收系统
公开(公告)号：US4853702A
公开(公告)日：1989-08-01
申请号：US743883
申请日：1985-06-12
申请人： Takayasu Shiokawa , Koji Yasukawa , Yoshio Karasawa
发明人： Takayasu Shiokawa , Koji Yasukawa , Yoshio Karasawa
IPC分类号： H01Q21/29 , H04B7/00 , H04B7/08 , H04B7/10
CPC分类号： H01Q21/29 , H04B7/086 , H04B7/10
摘要： A radio wave receiving system comprises an antenna having at least two antenna elements, a phase shifter connected to at least one of the antenna elements, and a combiner for combining signals passed through the phase shifter and other signals not passed through the phase shifter. Through proper control of the mutual phase difference between signals from the aforementioned antenna elements by using the phase shifter, the system alters the polarization characteristic of the antenna in the direction of incidence of undesired reflected waves and consequently supresses the fading due to undesired reflected waves.
摘要翻译：无线电波接收系统包括具有至少两个天线元件的天线，连接到至少一个天线元件的移相器和用于组合通过移相器的信号和未通过移相器的其它信号的组合器。通过使用移相器适当地控制来自上述天线元件的信号之间的相互相位差，该系统在不期望的反射波的入射方向上改变天线的偏振特性，并因此抑制由于不期望的反射波引起的衰落。

5. 发明授权

US4400703A Spiral array antenna 失效
标题翻译：螺旋阵列天线
公开(公告)号：US4400703A
公开(公告)日：1983-08-23
申请号：US269452
申请日：1981-06-02
申请人： Takayasu Shiokawa , Yoshio Karasawa
发明人： Takayasu Shiokawa , Yoshio Karasawa
IPC分类号： H01Q21/24 , H01Q11/08 , H01Q21/06 , H01Q21/28
CPC分类号： H01Q21/067 , H01Q11/08
摘要： A compact and light weight array antenna with a gain of approximately 13 dB comprises a plurality of axial-mode helical antennas with an antenna height of 0.4.about.0.6.lambda. (.lambda.: Wavelength) as element antennas, having cylindrical metallic rims with a rim height of approximately 0.25.lambda. surrounding each corresponding element antenna in order to suppress the characteristic degradation of the device caused by the mutual coupling of element antennas.
摘要翻译：具有大约13dB的增益的紧凑且重量轻的阵列天线包括具有作为元件天线的天线高度为0.4λ（λ：波长）的多个轴向模式螺旋天线，具有圆柱形金属边缘，边缘高度为大约0.25λ围绕每个对应的元件天线，以便抑制由元件天线的相互耦合引起的器件的特性劣化。

6. 发明授权

US4257048A Antenna system to reduce fading caused by multipath transmission 失效
标题翻译：天线系统减少由多路径传输引起的衰落
公开(公告)号：US4257048A
公开(公告)日：1981-03-17
申请号：US882247
申请日：1978-02-28
申请人： Hiroshi Yokoi , Takayasu Shiokawa
发明人： Hiroshi Yokoi , Takayasu Shiokawa
IPC分类号： H01Q1/34 , H01Q3/04 , H01Q3/10 , H01Q3/36 , H01Q3/28
CPC分类号： H01Q3/36 , H01Q1/34 , H01Q3/04 , H01Q3/10
摘要： An antenna system including a single directional antenna having a single directional gain pattern for receiving electromagnetic waves in a certain direction. The orientation of the directional gain pattern is varied to vary the gain of the antenna in directions other than the certain direction in which electromagnetic waves are to be received. The gain is varied at a frequency higher than that of amplitude variations superimposed on the received electromagnetic waves while maintaining the gain substantially constant in the certain direction in which electromagnetic waves are to be received. The antenna gain variations in the directions other than the certain direction are effective to reduce the amplitude of received undesired electromagnetic waves and thereby diminish amplitude variations caused by these undesired electromagnetic waves.
摘要翻译：一种天线系统，包括具有用于沿某一方向接收电磁波的单向增益图案的单向天线。改变方向增益图案的方向以改变除了要接收电磁波的特定方向之外的方向的天线的增益。增益以比接收的电磁波叠加的振幅变化的频率高的方式变化，同时保持增益在要接收电磁波的一定方向上基本上恒定。除特定方向之外的方向上的天线增益变化对于减小接收的不期望的电磁波的幅度是有效的，从而减小由这些不期望的电磁波引起的幅度变化。

7. 发明授权

US4074266A System for receiving radio waves through single antenna apparatus 失效
标题翻译：通过单个天线装置接收无线电波的系统
公开(公告)号：US4074266A
公开(公告)日：1978-02-14
申请号：US692778
申请日：1976-06-04
申请人： Hiroshi Yokoi , Takayasu Shiokawa
发明人： Hiroshi Yokoi , Takayasu Shiokawa
IPC分类号： H04B1/16 , H01Q3/26 , H04B7/08 , H04B7/10
CPC分类号： H01Q3/2647 , H04B7/08 , H04B7/10
摘要： A system for receiving through a single antenna apparatus a direct radio wave and reflected radio waves arriving from the same radio wave source, in which the resultant level of the direct radio wave and the reflected radio waves is detected under a condition where the directivity characteristic of the antenna apparatus is slightly altered at the arrival bearing of the reflected radio waves at intervals sufficiently shorter than that of fading perculiar to the paths of the direct wave and reflected waves, and the directivity characteristic of the antenna apparatus is modified at the arrival bearing of the reflected radio waves to raise the resultant level by the use of error voltages of the above intervals each indicative of the polarity of a difference between the directivity pattern of the antenna apparatus and an optimum pattern.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式