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公开(公告)号：EP1442499A1
公开(公告)日：2004-08-04
申请号：EP02795620.0
申请日：2002-11-08
发明人： HOWELL, James, M.
CPC分类号： H04B7/0408 , H01Q3/26 , H01Q21/061 , H01Q25/00
摘要： A phased array antenna system operative to broadcast multiple beams that each include coded data for specific users located within the coverage area of the corresponding beam. An appropriate receiver then receives and decodes a particular beam to extract the specific data for a corresponding user. Multiple users may be assigned to each beam using frequency division or orthogonal code multiplexing, and the user data may be encoded into the beams using frequency shift key or phase shift key encoding. For each coding technique, the encoded antenna control signals are combined into a total gain and total phase shift control signal, which drives a single phase and gain control device for each antenna element. In addition, a single data modulator generates the coding parameters for the entire communication system.
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公开(公告)号：EP1456903B1
公开(公告)日：2008-08-06
申请号：EP02793895.0
申请日：2002-11-08
CPC分类号： H01Q19/104 , H01Q1/3275 , H01Q3/04 , H01Q3/08 , H01Q3/20 , H01Q3/26 , H01Q19/062 , H01Q21/0043
摘要： A low-profile antenna system to be mounted to a moving vehicle for receiving signals, such as from a Digital Broadcast Satellite, includes a base for mounting to the surface of the vehicle, a platen mounted to the base for rotation, an azimuth drive motor for rotating the platen, an array of half-cylinder antenna elements mounted to the platen, an elevation drive motor for pivoting the antenna elements individually about their axes to change the elevation at which the antenna elements are pointing, and a cover. The azimuth drive motor and the elevation drive motor together allow the array of antenna elements to be pointed at a satellite over a wide range of vehicle orientations.
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公开(公告)号：EP1456903A1
公开(公告)日：2004-09-15
申请号：EP02793895.0
申请日：2002-11-08
CPC分类号： H01Q19/104 , H01Q1/3275 , H01Q3/04 , H01Q3/08 , H01Q3/20 , H01Q3/26 , H01Q19/062 , H01Q21/0043
摘要： A low-profile antenna system to be mounted to a moving vehicle for receiving signals, such as from a Digital Broadcast Satellite, includes a base for mounting to the surface of the vehicle, a platen mounted to the base for rotation, an azimuth drive motor for rotating the platen, an array of half-cylinder antenna elements mounted to the platen, an elevation drive motor for pivoting the antenna elements individually about their axes to change the elevation at which the antenna elements are pointing, and a cover. The azimuth drive motor and the elevation drive motor together allow the array of antenna elements to be pointed at a satellite over a wide range of vehicle orientations.
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公开(公告)号：EP1442498A1
公开(公告)日：2004-08-04
申请号：EP02789536.6
申请日：2002-11-08
发明人： HOWELL, James, M.
CPC分类号： H04B7/0837 , H01Q3/26 , H01Q21/061 , H01Q25/00
摘要： A phased array antenna system that is operative to simultaneously form multiple beams without requiring an undue amount of hardware. The system collects propagating energy with a number of antenna elements to form multiple beams, encodes the beams as the energy is collected, combines the encoded beams, and then decodes the combined signal to separate the beams. In this way, the beams can be formed with a single set of antenna hardware instead of requiring a multiplicity of antenna hardware, one for each beam. Frequency coding may be implemented by repeatedly applying a Doppler phase shift to each beam, and then using a Doppler filter to separate the beams. Alternatively, a code division multiplexing technique may be implemented by using a CDMA code generator to apply a code to each beam, and then using a CDMA filter to separate the beams.
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公开(公告)号：EP1095428A1
公开(公告)日：2001-05-02
申请号：EP99937185.9
申请日：1999-06-29
CPC分类号： H01Q19/08 , H01Q1/246 , H01Q13/02 , H01Q19/062
摘要： Varying the azimuth and elevation beam patterns for an antenna. For a horn-type antenna implemented by a parallel-plate waveguide structure, an input port can accept an electromagnetic signal and an output slot can transmit the electromagnetic signal. An azimuth lens can be placed proximate to the output slot for adjusting the antenna beam pattern within the azimuth plane. The azimuth lens comprises two or more lens elements, each typically having a cylindrical shape and comprising a dielectric material, which support the generation of discrete beams in the azimuth plane in response to the electromagnetic signal output by the output slot. These discrete beams can sum in-phase to form a composite beam having a shape or pattern generally defined by the characteristics of the azimuth lens elements. Specifically, this composite beam has a pattern within the azimuth plane defined by the size and shape of the azimuth lens elements and the spacing between these elements. In addition, the horn-antenna can include an elevation lens that can rotate within the internal parallel-plate structure of the horn-type antenna to vary the beam pattern within the elevation plane.
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公开(公告)号：EP1247353A2
公开(公告)日：2002-10-09
申请号：EP00968379.8
申请日：2000-09-21
发明人： SHARON, Thomas, E. , TAYLOR, Thomas, S. , HAFNER, William, R. , RIGG, Steven, H. , HOWELL, James, M.
IPC分类号： H04B7/185
CPC分类号： H04B7/18584
摘要： A satellite communications system having ground user terminals, hubs, and a geosynchronous satellite. The satellite generates a network of spot beam coverage areas on the earth. A hub and at least one ground terminal are located in each of at least two spot beams. A first user terminal transmits an uplink signal according to a first signal protocol to the hub through the satellite. A second user terminal receives a downlink signal according to a second signal protocol through the downlink spot beam from the hub through the satellite. The hub may be located in the same spot beam coverage area as the first or the second user terminal or may be located in an altogether different spot beam coverage area. Through selective frequency and/or polarization routing on board the satellite, a hub located within a 'parent' beam can communicate with user terminals within the parent beam at a specified frequency and polarization, and can communicate with users in other 'dependent' beams on a different frequency and/or polarization. This routing allocates the total available bandwidth between parent and dependent beams. The system enables asynchronous communications between each hub and the satellite to maximize frequency re-use and the overall capacity of the system.
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公开(公告)号：EP1442498B1
公开(公告)日：2006-08-09
申请号：EP02789536.6
申请日：2002-11-08
发明人： HOWELL, James, M.
CPC分类号： H04B7/0837 , H01Q3/26 , H01Q21/061 , H01Q25/00
摘要： A phased array antenna system that is operative to simultaneously form multiple beams without requiring an undue amount of hardware. The system collects propagating energy with a number of antenna elements to form multiple beams, encodes the beams as the energy is collected, combines the encoded beams, and then decodes the combined signal to separate the beams. In this way, the beams can be formed with a single set of antenna hardware instead of requiring a multiplicity of antenna hardware, one for each beam. Frequency coding may be implemented by repeatedly applying a Doppler phase shift to each beam, and then using a Doppler filter to separate the beams. Alternatively, a code division multiplexing technique may be implemented by using a CDMA code generator to apply a code to each beam, and then using a CDMA filter to separate the beams.
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公开(公告)号：EP1442499B1
公开(公告)日：2006-07-05
申请号：EP02795620.0
申请日：2002-11-08
发明人： HOWELL, James, M.
CPC分类号： H04B7/0408 , H01Q3/26 , H01Q21/061 , H01Q25/00
摘要： A phased array antenna system operative to broadcast multiple beams that each include coded data for specific users located within the coverage area of the corresponding beam. An appropriate receiver then receives and decodes a particular beam to extract the specific data for a corresponding user. Multiple users may be assigned to each beam using frequency division or orthogonal code multiplexing, and the user data may be encoded into the beams using frequency shift key or phase shift key encoding. For each coding technique, the encoded antenna control signals are combined into a total gain and total phase shift control signal, which drives a single phase and gain control device for each antenna element. In addition, a single data modulator generates the coding parameters for the entire communication system.
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公开(公告)号：EP1095428B1
公开(公告)日：2003-08-13
申请号：EP99937185.9
申请日：1999-06-29
CPC分类号： H01Q19/08 , H01Q1/246 , H01Q13/02 , H01Q19/062
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公开(公告)号：EP1247353B1
公开(公告)日：2003-07-16
申请号：EP00968379.8
申请日：2000-09-21
发明人： SHARON, Thomas, E. , TAYLOR, Thomas, S. , HAFNER, William, R. , RIGG, Steven, H. , HOWELL, James, M. , GLYNN, Thomas W. , KERSHNER, Dennis L.
IPC分类号： H04B7/185
CPC分类号： H04B7/18584
摘要： A satellite communications system having ground user terminals, hubs, and a geosynchronous satellite. The satellite generates a network of spot beam coverage areas on the earth. A hub and at least one ground terminal are located in each of at least two spot beams. A first user terminal transmits an uplink signal according to a first signal protocol to the hub through the satellite. A second user terminal receives a downlink signal according to a second signal protocol through the downlink spot beam from the hub through the satellite. The hub may be located in the same spot beam coverage area as the first or the second user terminal or may be located in an altogether different spot beam coverage area. Through selective frequency and/or polarization routing on board the satellite, a hub located within a "parent" beam can communicate with user terminals within the parent beam at a specified frequency and polarization, and can communicate with users in other "dependent" beams on a different frequency and/or polarization. This routing allocates the total available bandwidth between parent and dependent beams. The system enables asynchronous communications between each hub and the satellite to maximize frequency re-use and the overall capacity of the system.
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