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1. 发明授权

US06323817B1 Antenna cluster configuration for wide-angle coverage 有权
标题翻译：用于广角覆盖的天线集群配置
公开(公告)号：US06323817B1
公开(公告)日：2001-11-27
申请号：US09488205
申请日：2000-01-19
申请人： Parthasarathy Ramanujam , Stephen A. Robinson , Philip H. Law
发明人： Parthasarathy Ramanujam , Stephen A. Robinson , Philip H. Law
IPC分类号： H01Q1300
CPC分类号： H01Q1/288 , H01Q21/28 , H01Q25/007
摘要： A method and apparatus for producing contiguous spot beam communications coverage on the Earth's surface are disclosed. The apparatus comprises an antenna system including two wide scan antennas and two narrow scan antennas. The two wide scan antennas are disposed substantially opposite each other, and the two narrow scan antennas are disposed substantially opposite each other and substantially normal to the wide scan antennas. The first wide scan antenna, second wide scan antenna, and first narrow scan antenna produce a first beam pattern on a planetary surface and the first wide scan antenna, second wide scan antenna, and second narrow scan antenna produce a second beam pattern on the planetary surface.
摘要翻译：公开了一种用于在地球表面上产生连续点波束通信覆盖的方法和装置。该装置包括一个包括两个宽扫描天线和两个窄扫描天线的天线系统。两个宽扫描天线基本上彼此相对设置，并且两个窄扫描天线基本上彼此相对设置并且基本上垂直于宽扫描天线。第一宽扫描天线，第二宽扫描天线和第一窄扫描天线在行星表面上产生第一波束图案，并且第一宽扫描天线，第二宽扫描天线和第二窄扫描天线在行星上产生第二波束图案表面。

2. 发明授权

US06184838B2 Antenna configuration for low and medium earth orbit satellites 有权
公开(公告)号：US06184838B2
公开(公告)日：2001-02-06
申请号：US09196864
申请日：1998-11-20
申请人： Sudhakar K. Rao , Philip H. Law
发明人： Sudhakar K. Rao , Philip H. Law
IPC分类号： H01Q1906
CPC分类号： H01Q3/2605 , H01Q19/08
摘要： An antenna configuration suitable for LEO/MEO satellites includes a plurality of lenses whereby each lens has a plurality of feed horns positioned with respect to the lens. The lens has a first surface and a second surface. The plurality of feed horns is disposed upon a curved surface. Each of the plurality of feed horns generates a beam that has a phase distribution. The phase distributions have a predetermined phase relationship with the first surface and preferably the second surface. This allows the lens to transmit and receive a signal with desired phase distribution across a cross-section of the beam. The beams from the plurality of lenses are inter-leaved on the ground to form a contiguous coverage with multiple overlapping spot-beams.

3. 发明授权

US5936588A Reconfigurable multiple beam satellite phased array antenna 失效
标题翻译：可重构多波束卫星相控阵天线
公开(公告)号：US5936588A
公开(公告)日：1999-08-10
申请号：US092511
申请日：1998-06-05
申请人： Sudhakar K. Rao , Parthasarathy Ramanujam , Robert E. Vaughan , Philip H. Law
发明人： Sudhakar K. Rao , Parthasarathy Ramanujam , Robert E. Vaughan , Philip H. Law
IPC分类号： H01Q3/24 , H01Q21/06 , H01Q25/00 , H04B7/185 , H04B7/204
CPC分类号： H04B7/18519 , H01Q21/064 , H01Q25/008 , H01Q3/24 , H04B7/2041
摘要： A reconfigurable multiple beam phased array antenna has radiating elements arranged in a planar array and variable phase shifters. Each one of the phase shifters is connected to a respective one of the radiating elements. The array antenna further includes a beam forming network for forming spot and regional beam signals. The beam forming network forms a regional beam signal from a combination of spot beam signals. The beam forming network has two dimensional stacks of Rotman lenses provided with a first set of ports. Each one of the first set of ports is connected to a respective one of the radiating elements with. The Rotman lenses generate frequency invariant spot beam signals which are communicated between the radiating elements and the Rotman lenses via the first set of ports for transmission and reception of spot beams and regional beams by the radiating elements. The phase shifters are adjusted to steer the spot and regional beams to desired locations.
摘要翻译：可重构多光束相控阵天线具有布置在平面阵列中的辐射元件和可变移相器。每个移相器连接到相应的一个辐射元件。阵列天线还包括用于形成点和区域波束信号的波束形成网络。波束形成网络从点波束信号的组合形成区域波束信号。波束形成网络具有设置有第一组端口的Rotman透镜的二维叠层。第一组端口中的每一个都与相应的辐射元件连接。 Rotman透镜产生频率不变点波束信号，其通过第一组端口在辐射元件和Rotman透镜之间传递，用于通过辐射元件发射和接收点波束和区域波束。调整移相器以将斑点和区域光束转向所需位置。

4. 发明授权

US06759994B2 Multiple beam antenna using reflective and partially reflective surfaces 失效
公开(公告)号：US06759994B2
公开(公告)日：2004-07-06
申请号：US10206451
申请日：2002-07-26
申请人： Sudhakar K. Rao , Philip H. Law , Robert Lee Reynolds , George Voulelikas
发明人： Sudhakar K. Rao , Philip H. Law , Robert Lee Reynolds , George Voulelikas
IPC分类号： H01Q1502
CPC分类号： H01Q15/148
摘要： A hybrid reflector antenna particularly suited for reflecting a frequency band in a satellite includes a central portion fully reflective to the frequency band. A first annular band is disposed directly adjacent to the central portion. The first annular band is partially reflective to the frequency band. The reflector may include several annular bands having various degrees of reflectivity and thus attenuation. The present invention may be implemented using two such reflectors, one for transmitting and one for receiving in a satellite, for either single or multiple beam applications. This invention offers more compact and lower mass/cost antenna configurations compared to conventional antennas from multiple beam satellite payloads.

5. 发明授权

US06366256B1 Multi-beam reflector antenna system with a simple beamforming network 有权
标题翻译：具有简单波束成形网络的多波束反射器天线系统
公开(公告)号：US06366256B1
公开(公告)日：2002-04-02
申请号：US09665720
申请日：2000-09-20
申请人： Parthasarathy Ramanujam , Philip H. Law , Steven O. Lane
发明人： Parthasarathy Ramanujam , Philip H. Law , Steven O. Lane
IPC分类号： H01Q1914
CPC分类号： H01Q3/2658 , H01Q1/288 , H01Q19/192 , H01Q25/007 , H04B7/18515
摘要： An antenna system and method for generating a desired contiguous spot beam pattern, and a signal is disclosed. The contiguous spot beam generating antenna system comprises a reflector system configured in a side-fed Cassegrain (SFOC) configuration, an array of feed horns comprising at least a subset of feed horns for illuminating the reflector system, and a beamforming network, communicatively coupled to the array of feed horns, for controlling an excitation of the subset of the feed horns in the array of feed horns. The method comprises illuminating a side fed offset Cassegrain reflector system with an RF signal emanating from an array of feed horns, and controlling an excitation of the subset of the feed horns. The present invention provides a beamformer network that can produce uniform performance over wide scan angles, is easier to integrate and test, that can change the beam pattern on orbit, and that provides a more complete utilization of space assets without dramatically increasing the cost of manufacturing and operating a satellite. The use of a SFOC configuration or other wide scanning antenna permits the use of a simple beamforming network while maintaining excellent beam beam scanning characteristics.
摘要翻译：公开了一种用于产生期望的连续点波束图案的天线系统和方法，以及信号。连续点波束产生天线系统包括以侧馈卡塞格林（SFOC）配置配置的反射器系统，包括用于照射反射器系统的馈电喇叭的至少一个子集的馈电喇叭阵列，以及波束形成网络，通信地耦合到用于控制馈电喇叭阵列中馈电喇叭子集的激励的馈源喇叭阵列。该方法包括用从馈源喇叭阵列发出的RF信号照亮侧馈偏移卡塞格林反射器系统，以及控制馈电喇叭子集的激发。本发明提供了一种波束形成器网络，其可以在宽扫描角度上产生均匀的性能，更容易集成和测试，这可以改变轨道上的波束图案，并且在不显着增加制造成本的情况下提供更完整的利用空间资产并运行卫星。使用SFOC配置或其他宽扫描天线允许使用简单的波束成形网络，同时保持优异的波束扫描特性。

6. 发明授权

US6052095A Dual gridded reflector antenna 有权
标题翻译：双网格反射天线
公开(公告)号：US6052095A
公开(公告)日：2000-04-18
申请号：US267097
申请日：1999-03-10
申请人： Parthasarathy Ramanujam , Philip H. Law , Nancy Garcia , Daniel A. White
发明人： Parthasarathy Ramanujam , Philip H. Law , Nancy Garcia , Daniel A. White
IPC分类号： H01Q1/28 , H01Q15/14 , H01Q15/22 , H01Q19/13 , H01Q21/28 , H01Q25/00 , H01Q19/14
CPC分类号： H01Q21/28 , H01Q1/288 , H01Q15/147 , H01Q15/22 , H01Q19/132 , H01Q25/001 , Y10S343/02
摘要： An improved dual gridded reflector antenna configuration which allows cross-polarization radiation to be scanned in any given direction. The dual-gridded reflector assembly includes a front parabolic reflector illuminated by a first source, and a second parabolic reflector illuminated by a second source. The second reflector is positioned adjacent to and behind the front reflector such that the center points of the reflectors align to define a center axis. Additionally, the first and second sources are positioned at different offsets with respect to the reflectors and have a respective rotated offset angle with respect to the center axis such that the sources define an antenna feed separation. By modifying the offsets and the rotated offset angles, the feed separation can be designed to have an inclination with respect to the north-south or east-west feed separation direction.
摘要翻译：改进的双网格反射器天线配置，允许在任何给定方向上扫描交叉极化辐射。双网格反射器组件包括由第一源照射的前抛物面反射器和由第二源照射的第二抛物面反射器。第二反射器定位成与前反射器相邻并在其后面，使得反射器的中心点对准以限定中心轴线。此外，第一和第二源相对于反射器定位在不同的偏移处，并且相对于中心轴线具有相应的旋转偏移角，使得源限定天线馈送间隔。通过改变偏移量和旋转的偏移角度，进给分离可以被设计成相对于南北或东西方的进给分离方向具有倾斜度。

7. 发明授权

US06323815B1 Antenna configuration for low and medium earth orbit satellites 有权
标题翻译：中低轨道卫星的天线配置
公开(公告)号：US06323815B1
公开(公告)日：2001-11-27
申请号：US09590325
申请日：2000-06-08
申请人： Sudhakar K. Rao , Philip H. Law
发明人： Sudhakar K. Rao , Philip H. Law
IPC分类号： H01Q1906
CPC分类号： H01Q3/2605 , H01Q19/08
摘要： An antenna configuration suitable for LEO/MEO satellites includes a plurality of lenses whereby each lens has a plurality of feed horns positioned with respect to the lens. The lens has a first surface and a second surface. The plurality of feed horns is disposed upon a curved surface. Each of the plurality of feed horns generates a beam that has a phase distribution. The phase distributions have a predetermined phase relationship with the first surface and preferably the second surface. This allows the lens to transmit and receive a signal with desired phase distribution across a cross-section of the beam. The beams from the plurality of lenses are inter-leaved on the ground to form a contiguous coverage with multiple overlapping spot-beams.
摘要翻译：适用于LEO / MEO卫星的天线配置包括多个透镜，由此每个透镜具有相对于透镜定位的多个馈送喇叭。透镜具有第一表面和第二表面。多个馈电喇叭设置在弯曲表面上。多个馈电喇叭中的每一个产生具有相位分布的光束。相位分布与第一表面和第二表面具有预定的相位关系。这允许透镜在束的横截面上发送和接收具有期望的相位分布的信号。来自多个透镜的光束在地面上彼此分开以形成具有多个重叠点光束的连续覆盖。

8. 发明授权

US6150990A Method for reducing cross-polar degradation in multi-feed dual offset reflector antennas 失效
标题翻译：减少多馈双重偏移反射天线的极化降解的方法
公开(公告)号：US6150990A
公开(公告)日：2000-11-21
申请号：US119301
申请日：1998-07-20
申请人： Parthasarathy Ramanujam , Philip H. Law , Louis R. Fermelia
发明人： Parthasarathy Ramanujam , Philip H. Law , Louis R. Fermelia
IPC分类号： H01Q3/24 , H01Q19/02 , H01Q19/17 , H01Q19/19 , H01Q25/04 , H01Q1/28
CPC分类号： H01Q19/192 , H01Q19/028 , H01Q19/17 , H01Q3/245
摘要： A unique feed structure for improving the cross-polarization performance of a reflector antenna system is disclosed. According to the present invention, the feed structure is an array including a number of feeds, which are rotated in a predetermined fashion to yield superior cross polarization performance of the antenna system. The array feed in the center of the feed structure is positioned approximately in the focus of the antenna reflector. The array feeds located on the y-axis are slightly rotated in either a clockwise or a counter-clockwise manner. The magnitude of the rotation is proportional to the distance of the feeds from the x-axis along the y-axis. The rotation of the feeds yields significant performance in cross polarization performance, while having little or no co-polarization effect.
摘要翻译：公开了一种用于改善反射器天线系统的交叉极化性能的独特馈电结构。根据本发明，进料结构是包括多个进料的阵列，其以预定的方式旋转以产生天线系统的优异的交叉极化性能。进料结构中心的阵列进给位置大致位于天线反射器的焦点。位于y轴上的阵列进给顺时针或逆时针方向稍微旋转。旋转的幅度与X轴沿着y轴的进给距离成比例。馈送的旋转在交叉极化性能方面产生显着的性能，同时具有很少的或没有共极化效应。

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