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1. 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。

2. 发明授权

US5936592A Reconfigurable multiple beam satellite reflector antenna with an array feed 失效
标题翻译：可重构多波束卫星反射天线与阵列馈电
公开(公告)号：US5936592A
公开(公告)日：1999-08-10
申请号：US92510
申请日：1998-06-05
申请人： Parthasarathy Ramanujam , Sudhakar K. Rao , Robert E. Vaughan , James C. McCleary
发明人： Parthasarathy Ramanujam , Sudhakar K. Rao , Robert E. Vaughan , James C. McCleary
IPC分类号： H01Q3/26 , H01Q25/00 , H01Q21/00
CPC分类号： H01Q25/007 , H01Q3/2605
摘要： A reconfigurable multiple beam array antenna for transmitting beams includes a reflector and radiating elements for feeding beam signals to the reflector. The array antenna includes a reconfigurable beam forming network having a plurality of dividers, a plurality of adjustable phase shifter and attenuator pairs, and a plurality of combiners to form beam signals from beam signals input to the beam forming network. A first hybrid matrix formed by an association of couplers is connected to the beam forming network for receiving the beam signals. Amplifiers receive and amplify the beam signals from the first hybrid matrix. A second hybrid matrix formed by an association of couplers is connected to the amplifiers for receiving the beam signals. The second hybrid matrix provides the amplified beam signals to the radiating elements for the reflector to transmit beams.
摘要翻译：用于发射光束的可重构多光束阵列天线包括用于将光束信号馈送到反射器的反射器和辐射元件。阵列天线包括具有多个分频器的可重构波束形成网络，多个可调移相器和衰减器对，以及多个组合器，以从输入到波束形成网络的波束信号形成波束信号。由耦合器的关联形成的第一混合矩阵连接到用于接收波束信号的波束形成网络。放大器接收和放大来自第一混合矩阵的波束信号。由耦合器的关联形成的第二混合矩阵连接到用于接收波束信号的放大器。第二混合矩阵将放大的波束信号提供给用于反射器的辐射元件以发射波束。

3. 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。

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

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.

6. 发明授权

US06442148B1 Reconfigurable multibeam communications satellite having frequency channelization 有权
标题翻译：具有频率信道化的可重构多波束通信卫星
公开(公告)号：US06442148B1
公开(公告)日：2002-08-27
申请号：US09222200
申请日：1998-12-23
申请人： Gerald J. Adams , Paul D. Tarbuck , Robert E. Vaughan , Shih-Chang Wu , Thomas S. La France , Sudhakar K. Rao
发明人： Gerald J. Adams , Paul D. Tarbuck , Robert E. Vaughan , Shih-Chang Wu , Thomas S. La France , Sudhakar K. Rao
IPC分类号： H04B719
CPC分类号： H04B7/2041
摘要： A satellite subsystem for a satellite employs a reconfigurable communications payload and active array antennas. The subsystem includes an active receive array antenna having a reconfigurable beam forming network for forming input beam signals from input signals received by the receive antenna from sources. An input switch matrix power divides the input beam signals into sets of input beam signals. Each of the channel signals corresponds to a respective channel of the input beam signals. The subsystem further includes a channelizer having a plurality of channel processors each receiving at least one input beam signal from the input switch matrix. The channel processors filter the input beam signals into channel signals. Each of the channel signals corresponds to a respective channel of the input beam signals. The channel processors change the frequency of at least one channel signal to route the at least one channel signal to a different channel than the respective channel of the input beam signals. An output switch matrix combines the channel signals into output beam signals. Each of the channel signals corresponds to a respective channel of the output beam signals. An active transmit array antenna having a reconfigurable beam forming network forms output signals from the output beam signals for transmission by the transmit array antenna to destinations.
摘要翻译：用于卫星的卫星子系统采用可重新配置的通信有效载荷和有源阵列天线。子系统包括具有可重构波束形成网络的有源接收阵列天线，用于根据由接收天线从源接收的输入信号形成输入波束信号。输入开关矩阵功率将输入波束信号分为输入波束信号组。每个信道信号对应于输入波束信号的相应信道。子系统还包括具有多个信道处理器的信道化器，每个信道处理器从输入交换矩阵接收至少一个输入波束信号。信道处理器将输入波束信号滤波成信道信号。每个信道信号对应于输入波束信号的相应信道。信道处理器改变至少一个信道信号的频率以将至少一个信道信号路由到与输入波束信号的相应信道不同的信道。输出开关矩阵将通道信号组合成输出光束信号。每个通道信号对应于输出光束信号的相应通道。具有可重构波束形成网络的有源发射阵列天线从输出波束信号形成输出信号，以便由发射阵列天线发射到目的地。

7. 发明授权

US07737904B2 Antenna systems for multiple frequency bands 有权
标题翻译：多频段天线系统
公开(公告)号：US07737904B2
公开(公告)日：2010-06-15
申请号：US12137472
申请日：2008-06-11
申请人： Sudhakar K. Rao , Chris G. Baran , Chih-Chien Hsu , Surjit S. Dhillon
发明人： Sudhakar K. Rao , Chris G. Baran , Chih-Chien Hsu , Surjit S. Dhillon
IPC分类号： H01Q13/00
CPC分类号： H01Q13/0258 , H01Q1/288 , H01Q5/55 , H01Q13/0241 , H01Q19/12
摘要： An antenna system for transmitting and/or receiving radio frequency (RF) signals in multiple frequency bands includes a horn antenna and a feed network. The horn antenna may transmit and/or receive RF signals in multiple frequency bands that are spread over more than an octave bandwidth with at least a 2.44-to-1 bandwidth ratio. The horn antenna includes a throat, an aperture, and an interior surface. The feed network includes a first waveguide section, a first junction, one or more first filters, and a first step-down waveguide section. The first waveguide section can provide a matching network and transmit and/or receive the RF signals in the multiple frequency bands. The first junction can transmit and/or receive the RF signals in first selected band(s) of the multiple frequency bands. The first step-down waveguide section may transmit and/or receive the RF signals in second selected band(s) of the multiple frequency bands.
摘要翻译：用于在多个频带中发射和/或接收射频（RF）信号的天线系统包括喇叭天线和馈电网络。喇叭天线可以在多个频带上传送和/或接收以至少一个2.44比-1的带宽比扩频超过八度带宽的RF信号。喇叭天线包括喉部，孔和内表面。馈电网络包括第一波导部分，第一连接点，一个或多个第一滤波器和第一降压波导部分。第一波导部分可以提供匹配网络，并在多个频带中发送和/或接收RF信号。第一结可以在多个频带的第一选定频带中发送和/或接收RF信号。第一降压波导部分可以在多个频带的第二选定频带中发射和/或接收RF信号。

8. 发明授权

US07710340B2 Reconfigurable payload using non-focused reflector antenna for HIEO and GEO satellites 有权
标题翻译：可重构有效载荷，用于HIEO和GEO卫星的非聚焦反射天线
公开(公告)号：US07710340B2
公开(公告)日：2010-05-04
申请号：US11480497
申请日：2006-07-05
申请人： Sudhakar K. Rao , Stephen R. Peck , Minh Tang , Jim Wang , David M. Brown
发明人： Sudhakar K. Rao , Stephen R. Peck , Minh Tang , Jim Wang , David M. Brown
IPC分类号： H01Q13/00
CPC分类号： H01Q19/12 , H01Q19/10 , H01Q19/17 , H01Q25/007
摘要： An antenna system for generating and configuring at least one defocused beam is provided. The antenna system includes a reflector having a focal plane and a non-parabolic curvature for forming the at least one defocused beam, and a plurality of feed antennas that illuminate the reflector. Each feed antenna is disposed in the focal plane of the reflector. The antenna system further includes at least one incoming signal dividing network that divides at least one incoming signal into a plurality of sub-signals, each corresponding to one of the feed antennas, a plurality of variable phase shifters, each receiving one of the sub-signals from the incoming signal dividing network and phase shifting the sub-signal to generate a corresponding phase-shifted sub-signal, and a plurality of fixed-amplitude amplifiers, at least one corresponding to each of the feed antennas. The at least one amplifier for each feed antenna amplifies the corresponding phase-shifted sub-signal to generate an amplified phase-shifted sub-signal which is provided to the corresponding feed antenna.
摘要翻译：提供了一种用于产生和配置至少一个散焦光束的天线系统。天线系统包括具有用于形成至少一个散焦光束的焦平面和非抛物线曲率的反射器，以及照射反射器的多个馈送天线。每个馈送天线设置在反射器的焦平面中。天线系统还包括至少一个输入信号分配网络，其将至少一个输入信号分成多个子信号，每个子信号对应于馈送天线之一，多个可变移相器，每个接收子载波中的一个子信号，来自输入信号分割网络的信号和相移子信号以产生对应的相移子信号，以及多个固定幅度放大器，至少一个对应于每个馈送天线。用于每个馈送天线的至少一个放大器放大对应的相移子信号以产生提供给相应的馈电天线的放大的相移子信号。

9. 发明申请

US20120105293A1 HORN ANTENNA AND SYSTEM FOR TRANSMITTING AND/OR RECEIVING RADIO FREQUENCY SIGNALS IN MULTIPLE FREQUENCY BANDS 有权
标题翻译：用于传输和/或接收多个频率范围内的无线电频率信号的天线和系统
公开(公告)号：US20120105293A1
公开(公告)日：2012-05-03
申请号：US12137416
申请日：2008-06-11
申请人： Chih-Chien Hsu , Sudhakar K. Rao
发明人： Chih-Chien Hsu , Sudhakar K. Rao
IPC分类号： H01Q13/02
CPC分类号： H01Q13/02 , H01Q13/0208 , H01Q13/025 , H01Q13/0266 , H01Q19/17
摘要： A horn antenna includes smooth-walls with multiple slope discontinuities. The horn antenna may have more than an octave bandwidth with a 2.25:1 bandwidth ratio to cover the frequencies of 20 GHz, 30 GHz, and 45 GHz, or all the desired bands for military or other communications.
摘要翻译：喇叭天线包括具有多个斜率不连续性的平滑壁。喇叭天线可能具有超过一个带宽为2.25：1的倍频带宽，以覆盖20 GHz，30 GHz和45 GHz的频率，或用于军事或其他通信的所有期望频带。

10. 发明授权

US07110716B2 Dual-band multiple beam antenna system for communication satellites 有权
公开(公告)号：US07110716B2
公开(公告)日：2006-09-19
申请号：US10060822
申请日：2002-01-30
申请人： Sudhakar K. Rao , David Bressler , Arun Bhattacharyya
发明人： Sudhakar K. Rao , David Bressler , Arun Bhattacharyya
IPC分类号： H04B7/185
CPC分类号： H01Q13/0208 , H01Q1/288 , H01Q5/55 , H01Q19/13 , H01Q25/04
摘要： A dual-band multiple beam antenna system for a communications satellite sharing a set of reflector antennas for the transmit and receive frequencies. One set of reflectors is common to both the downlink and uplink frequencies. The feed horns are diplexed and exhibit frequency-dependent radiation patterns that separate the phase centers over the downlink and uplink frequency bands to obtain dual-band performance. The focal point of the reflector is in close proximity to the phase center corresponding to the downlink frequency band. The phase center for the uplink frequency band is spaced a predetermined distance from the phase center of the downlink frequency band. According to the present invention, the uplink frequencies are defocused and the downlink frequencies are focused thereby creating identical radiation patterns at both frequency bands and over the coverage region of the communications satellite.

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