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    • 7. 发明授权
    • Radio frequency electromagnetic emissions shield
    • 射频电磁屏蔽
    • US06803883B2
    • 2004-10-12
    • US10248732
    • 2003-02-13
    • Ted A. AbramsJohn M. DuckworthGregory A. O'Neill, Jr.Ludwik J. WodkaArie C. Slaa
    • Ted A. AbramsJohn M. DuckworthGregory A. O'Neill, Jr.Ludwik J. WodkaArie C. Slaa
    • H01Q152
    • H01Q17/00H01Q1/44H01Q1/526
    • A shield for shielding radio frequency emissions being emitted from a communications antenna. The shield has a first layer of material having the physical property of generally absorbing radio frequency electromagnetic emissions and a second layer of material having the physical property of generally reflecting radio frequency emissions. The first layer of material is positioned between the second layer of material and the communications antenna. Therefore, the first layer of material absorbs a portion of the radio frequency emissions from the communications antenna, and the second layer of material reflects back the remaining emissions to the first layer of material. Therefore, the first layer absorbs a further portion of the remaining emissions. A layer of absorbing material is placed between the combined first & second layers and a material that is transparent to radio frequency emissions and through which the communications antenna radiates radio frequency energy. The purpose of the absorbing material between the transparent material and the combined first & second layers is to minimize escape of radio frequency energy along the transparent material. The radio frequency energy could otherwise escaped around the barrier of the first & second layers due to reflection and refraction of radio frequency energy within the body of the transparent material.
    • 用于屏蔽从通信天线发射的射频发射的屏蔽。 屏蔽件具有第一层材料,其具有通常吸收射频电磁辐射的物理性质和具有通常反射射频发射的物理性质的第二材料层。 第一层材料位于第二层材料和通信天线之间。 因此,第一层材料吸收来自通信天线的一部分射频发射,并且第二层材料将剩余的发射反射回第一层材料。 因此,第一层吸收剩余排放物的另一部分。 吸收材料层被放置在组合的第一和第二层之间以及对于射频发射是透明的材料,并且通信天线辐射出射频能量。 透明材料和组合的第一和第二层之间的吸收材料的目的是使射频能量沿着透明材料的逸出最小化。 由于透明材料的体内的射频能量的反射和折射,射频能量可以绕第一和第二层的屏障逸出。
    • 8. 发明授权
    • Systems and methods for coaxially coupling an antenna through an insulator
    • 通过绝缘体同轴耦合天线的系统和方法
    • US06215449B1
    • 2001-04-10
    • US09248887
    • 1999-02-11
    • Gregory A. O'Neill, Jr.
    • Gregory A. O'Neill, Jr.
    • H01Q132
    • H01Q23/00H01Q1/1264
    • Coaxial coupling systems and methods couple a first coaxial cable that includes a first inner conductor and first shield conductor to a second coaxial cable that includes a second inner conductor and a second shield conductor, through an insulator that includes first and second insulator surfaces. A first center plate and a first surrounding plate are adapted for attachment to the first insulator surface such that the first surrounding plate surrounds the first center plate on the first insulator surface. The first center plate is electrically connected to the first inner conductor and the first surrounding plate is electrically connected to the first shield conductor. A second center plate and a second surrounding plate are adapted for attachment to the second insulator surface such that the second surrounding plate surrounds the second center plate on the second insulator surface, the first and second center plates are adjacent one another with the insulator therebetween and the first and second surrounding plates are adjacent one another and the insulator therebetween. The second center plate is electrically connected to the second inner conductor and the second surrounding plate is electrically connected to the second shield conductor. The coaxial coupling systems and methods can allow communication signals to pass with low insertion loss, over a desired frequency range, between an antenna mounted outside a window and a radio transceiver mounted inside the window. Transmission takes place via a coaxial transmission line on each side of the window.
    • 同轴耦合系统和方法通过包括第一和第二绝缘体表面的绝缘体将包括第一内部导体和第一屏蔽导体的第一同轴电缆耦合到包括第二内部导体和第二屏蔽导体的第二同轴电缆。 第一中心板和第一围绕板适于附接到第一绝缘体表面,使得第一围绕板围绕第一绝缘体表面上的第一中心板。 第一中心板电连接到第一内部导体,并且第一围绕板电连接到第一屏蔽导体。 第二中心板和第二周围板适于附接到第二绝缘体表面,使得第二围绕板围绕第二绝缘体表面上的第二中心板,第一和第二中心板彼此相邻并且其间具有绝缘体,并且 第一和第二围绕板彼此相邻并且其间的绝缘体。 第二中心板电连接到第二内导体,第二围板与第二屏蔽导体电连接。 同轴耦合系统和方法可以允许通信信号在安装在窗外的天线和安装在窗口内的无线电收发机之间的所需频率范围内具有低插入损耗。 通过窗口两侧的同轴传输线进行传输。
    • 9. 发明授权
    • L-band quadrifilar helix antenna
    • L波段四极螺旋天线
    • US5920292A
    • 1999-07-06
    • US770399
    • 1996-12-20
    • Gregory A. O'Neill, Jr.
    • Gregory A. O'Neill, Jr.
    • H01Q1/24H01Q5/00H01Q5/50H01Q11/08H01Q1/36
    • H01Q11/08H01Q1/242H01Q5/50
    • Physically small quadrifilar helix antenna systems capable of providing a positive gain, quasi-hemispherical antenna pattern over a relatively broadband frequency range in the L-Band frequency band. The antenna systems according to the present invention generally comprise a quadrifilar helix antenna and at least one antenna feed network, and may further comprise matching means for improving the broadband frequency performance of the antenna. In a preferred embodiment, the elements of the quadrifilar helix antenna which form each bifilar helix are short-circuited at their distal ends, and energy is fed to and induced from the antenna via receive and transmit 90.degree. hybrid couplers which are electrically connected to the bifilar loops of the quadrifilar helix antenna. The antenna systems may further include first and second circuit branches for changing the resonant frequency of the antenna to first and second resonant frequencies corresponding to separate transmit and receive frequency bands, and switches or other disconnection means which are used to electrically isolate the first circuit branch from the antenna during periods when the antenna is receiving a signal and to electrically isolate the second circuit branch from the antenna during periods of transmission.
    • 物理上小的四边形螺旋天线系统能够在L波段频段的相对宽带频率范围内提供正增益准半球形天线方向图。 根据本发明的天线系统通常包括四极螺旋天线和至少一个天线馈电网络,并且还可以包括用于改善天线的宽带频率性能的匹配装置。 在优选实施例中,形成每个双螺旋线的四边形螺旋天线的元件在其远端处短路,并且能量通过接收和发射90°混合耦合器馈送到天线并从天线引出,该耦合器电连接到 四线螺旋天线的双瓣环。 天线系统还可以包括用于将天线的谐振频率改变为对应于单独的发射和接收频带的第一和第二谐振频率的第一和第二电路分支,以及用于将第一电路分支电隔离的开关或其他断开装置 在天线正在接收信号期间从天线发射,并且在传输期间将第二电路支路与天线电隔离。
    • 10. 发明授权
    • Deployable quadrifilar helical antenna
    • US09742058B1
    • 2017-08-22
    • US15223672
    • 2016-07-29
    • Gregory A. O'Neill, Jr.
    • Gregory A. O'Neill, Jr.David M. Cross
    • H01Q1/28H01Q1/36H01Q1/08
    • H01Q1/288H01Q1/08H01Q1/362H01Q11/086
    • Systems, devices, and methods for providing deployable and collapsible Quadrifilar Helical Antennas (QHA) on small satellites to improve communications in low earth orbit satellites. Monopole antennas are very popular for use on small satellites, generally because they are relatively easy to attach. By using circularly polarized antennas for the spacecraft and the ground station, polarization losses are virtually eliminated. The QHA can be designed to have a wide range of circularly polarized antenna patterns. Low power transmitters are employed on the small satellite to be consistent with the available energy. The communication link budgets are dependent on good radiation pattern characteristics for the small satellite downlink where higher data rates are required. Quadrifilar Helical Antennas can be collapsed and stowed inside a module to mount inside typical cubes known as 1U through 27U size small satellites. After launch from the rocket, the QHA can be deployed to its stored memory shape. The QHA radiating filars can be made from Nitinol wires having an activation temperature above which the filars resume their stored memory shape acquired during heating treatments. QHA applies an electrical direct current onto the filars after launch of the small satellite independent of the radio frequency of the QHA.