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公开(公告)号：US07110716B2
公开(公告)日：2006-09-19
申请号：US10060822
申请日：2002-01-30
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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公开(公告)号：US07242904B2
公开(公告)日：2007-07-10
申请号：US11259913
申请日：2005-10-27
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.
摘要翻译： 一种用于通信卫星的双频多波束天线系统，其共享用于发射和接收频率的一组反射器天线。 一组反射器对于下行链路和上行链路频率是共同的。 馈电喇叭是双工的，并且表现出频率依赖的辐射图，其通过下行链路和上行链路频带分离相位中心以获得双频带性能。 反射器的焦点靠近对应于下行链路频带的相位中心。 上行频带的相位中心与下行频带的相位中心隔开规定的距离。 根据本发明，上行链路频率被散焦，并且下行链路频率被聚焦，从而在通信卫星的两个频带和覆盖区域上产生相同的辐射图。
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公开(公告)号：US20080278397A1
公开(公告)日：2008-11-13
申请号：US12165012
申请日：2008-06-30
申请人： Sudhakar K. Rao , David Bressler
发明人： Sudhakar K. Rao , David Bressler
IPC分类号： H01Q13/02
CPC分类号： H01Q25/007 , H01Q5/45 , H01Q19/17
摘要： An antenna system includes a reflector having a modified-paraboloid shape; and a multi-beam, multi-band feed array located at a focal point of the reflector so that the antenna system forms a multiple congruent beams that are contiguous. The system has a single reflector with non-frequency selective surface. The reflector is sized to produce a required beam size at K-band frequencies and is oversized at EHF-band frequencies. The synthesized reflector surface is moderately shaped and disproportionately broadens EHF-band and Ka-band beams compared to K-band beams. The synthesized reflector surface forms multiple beams each having a 0.5-degree diameter at K-band, Ka-band, and EHF band. The multi-beam, multi-band feed array includes a number of high-efficiency, multi-mode circular horns that operate in focused mode at K-band and defocused mode at Ka-band and EHF-band by employing “frequency-dependent” design for the horns.
摘要翻译： 天线系统包括具有改性抛物面形状的反射器; 以及位于反射器的焦点处的多光束，多波段馈电阵列，使得天线系统形成连续的多个一致的光束。 该系统具有一个具有非频率选择性表面的反射器。 反射器的尺寸被设计成在K波段频率处产生所需的波束尺寸，并且在EHF频带频率处变大。 合成的反射器表面适度成形，与K波段光束相比，EHF带和Ka波段光束不均衡地扩大。 合成的反射器表面形成多个光束，每个光束在K波段，Ka波段和EHF波段具有0.5度直径。 多波束多频馈电阵列包括多个高效多模环形喇叭，它们在Ka波段和EHF波段的K波段和散焦模式下以聚焦模式工作，采用“频率依赖” 喇叭设计。
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公开(公告)号：US07394436B2
公开(公告)日：2008-07-01
申请号：US11362427
申请日：2006-02-23
申请人： Sudhakar K. Rao , David Bressler
发明人： Sudhakar K. Rao , David Bressler
IPC分类号： H01Q13/00
CPC分类号： H01Q25/007 , H01Q5/45 , H01Q19/17
摘要： An antenna system includes a reflector having a modified-paraboloid shape; and a multi-beam, multi-band feed array located at a focal point of the reflector so that the antenna system forms a multiple congruent beams that are contiguous. The system has a single reflector with non-frequency selective surface. The reflector is sized to produce a required beam size at K-band frequencies and is oversized at EHF-band frequencies. The synthesized reflector surface is moderately shaped and disproportionately broadens EHF-band and Ka-band beams compared to K-band beams. The synthesized reflector surface forms multiple beams each having a 0.5-degree diameter at K-band, Ka-band, and EHF band. The multi-beam, multi-band feed array includes a number of high-efficiency, multi-mode circular horns that operate in focused mode at K-band and defocused mode at Ka-band and EHF-band by employing “frequency-dependent” design for the horns.
摘要翻译： 天线系统包括具有改性抛物面形状的反射器; 以及位于反射器的焦点处的多光束，多波段馈电阵列，使得天线系统形成连续的多个一致的光束。 该系统具有一个具有非频率选择性表面的反射器。 反射器的尺寸被设计成在K波段频率处产生所需的波束尺寸，并且在EHF频带频率处变大。 合成的反射器表面适度成形，与K波段光束相比，EHF带和Ka波段光束不均衡地扩大。 合成的反射器表面形成多个光束，每个光束在K波段，Ka波段和EHF波段具有0.5度直径。 多波束多频馈电阵列包括多个高效多模环形喇叭，它们在Ka波段和EHF波段的K波段和散焦模式下以聚焦模式工作，采用“频率依赖” 喇叭设计。
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公开(公告)号：US07868840B2
公开(公告)日：2011-01-11
申请号：US12165012
申请日：2008-06-30
申请人： Sudhakar K. Rao , David Bressler
发明人： Sudhakar K. Rao , David Bressler
IPC分类号： H01Q13/10
CPC分类号： H01Q25/007 , H01Q5/45 , H01Q19/17
摘要： An antenna system includes a reflector having a modified-paraboloid shape; and a multi-beam, multi-band feed array located at a focal point of the reflector so that the antenna system forms a multiple congruent beams that are contiguous. The system has a single reflector with non-frequency selective surface. The reflector is sized to produce a required beam size at K-band frequencies and is oversized at EHF-band frequencies. The synthesized reflector surface is moderately shaped and disproportionately broadens EHF-band and Ka-band beams compared to K-band beams. The synthesized reflector surface forms multiple beams each having a 0.5-degree diameter at K-band, Ka-band, and EHF band. The multi-beam, multi-band feed array includes a number of high-efficiency, multi-mode circular horns that operate in focused mode at K-band and defocused mode at Ka-band and EHF-band by employing “frequency-dependent” design for the horns.
摘要翻译： 天线系统包括具有改性抛物面形状的反射器; 以及位于反射器的焦点处的多光束，多波段馈电阵列，使得天线系统形成连续的多个一致的光束。 该系统具有一个具有非频率选择性表面的反射器。 反射器的尺寸被设计成在K波段频率处产生所需的波束尺寸，并且在EHF频带频率处变大。 合成的反射器表面适度成形，与K波段光束相比，EHF带和Ka波段光束不均衡地扩大。 合成的反射器表面形成多个光束，每个光束在K波段，Ka波段和EHF波段具有0.5度直径。 多波束多频馈电阵列包括多个高效多模环形喇叭，它们在Ka波段和EHF波段的K波段和散焦模式下以聚焦模式工作，采用“频率依赖” 喇叭设计。
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公开(公告)号：US07034771B2
公开(公告)日：2006-04-25
申请号：US10659826
申请日：2003-09-10
申请人： Sudhakar K. Rao , David Bressler
发明人： Sudhakar K. Rao , David Bressler
IPC分类号： H01Q19/12
CPC分类号： H01Q25/007 , H01Q5/45 , H01Q19/17
摘要： An antenna system includes a reflector having a modified-paraboloid shape; and a multi-beam, multi-band feed array located at a focal point of the reflector so that the antenna system forms a multiple congruent beams that are contiguous. The system has a single reflector with non-frequency selective surface. The reflector is sized to produce a required beam size at K-band frequencies and is oversized at EHF-band frequencies. The synthesized reflector surface is moderately shaped and disproportionately broadens EHF-band and Ka-band beams compared to K-band beams. The synthesized reflector surface forms multiple beams each having a 0.5-degree diameter at K-band, Ka-band, and EHF band. The multi-beam, multi-band feed array includes a number of high-efficiency, multi-mode circular horns that operate in focused mode at K-band and defocused mode at Ka-band and EHF-band by employing “frequency-dependent” design for the horns.
摘要翻译： 天线系统包括具有改性抛物面形状的反射器; 以及位于反射器的焦点处的多光束，多波段馈电阵列，使得天线系统形成连续的多个一致的光束。 该系统具有一个具有非频率选择性表面的反射器。 反射器的尺寸被设计成在K波段频率处产生所需的波束尺寸，并且在EHF频带频率处变大。 合成的反射器表面适度成形，与K波段光束相比，EHF带和Ka波段光束不均衡地扩大。 合成的反射器表面形成多个光束，每个光束在K波段，Ka波段和EHF波段具有0.5度直径。 多波束多频馈电阵列包括多个高效多模环形喇叭，它们在Ka波段和EHF波段的K波段和散焦模式下以聚焦模式工作，采用“频率依赖” 喇叭设计。
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公开(公告)号：US07737904B2
公开(公告)日：2010-06-15
申请号：US12137472
申请日：2008-06-11
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。
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8.发明授权Reconfigurable payload using non-focused reflector antenna for HIEO and GEO satellites 有权可重构有效载荷，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。
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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。
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10.发明授权
公开(公告)号：US5936592A
公开(公告)日：1999-08-10
申请号：US92510
申请日：1998-06-05
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。
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