Patents by Inventor Simon John Stirland
Simon John Stirland has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20150333409Abstract: A satellite antenna arrangement for a satellite communication system comprising: a reflector for producing a far field pattern with near-zero field strength at a predetermined location to reject unwanted signals from said predetermined location or minimise signal power transmitted to said predetermined location, the reflector having a surface comprising a stepped profile arranged to generate the near-zero field strength in the predetermined location. The stepped profile may comprise a radial step. The location of the near-zero field strength can be steered by moving the reflector or by adjusting the amplitude and phase of an additional beam that covers substantially the same region as the main beam reflected by the reflector.Type: ApplicationFiled: February 17, 2010Publication date: November 19, 2015Inventors: David Robson, Simon John Stirland
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Patent number: 9190716Abstract: A satellite antenna arrangement for a satellite communication system comprising: a reflector for producing a far field pattern with near-zero field strength at a predetermined location to reject unwanted signals from said predetermined location or minimize signal power transmitted to said predetermined location, the reflector having a surface comprising a stepped profile arranged to generate the near-zero field strength in the predetermined location. The stepped profile may comprise a radial step. The location of the near-zero field strength can be steered by moving the reflector or by adjusting the amplitude and phase of an additional beam that covers substantially the same region as the main beam reflected by the reflector.Type: GrantFiled: February 17, 2010Date of Patent: November 17, 2015Assignee: ASTRIUM LIMITEDInventors: David Robson, Simon John Stirland
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Patent number: 8897403Abstract: A phased array antenna for providing a radiation pattern having at least one communication beam, includes a plurality of antenna elements, each with an antenna element signal having a phase relationship and an amplitude relationship to the other element signals; a digital signal processing arrangement providing a digital beamforming network; and an analog beamforming network arranged to reduce exposure of the digital signal processing arrangement to an interfering signal. Analog beamforming weights are selected to generate a null in the radiation pattern in a direction corresponding to the interfering signal.Type: GrantFiled: June 22, 2011Date of Patent: November 25, 2014Assignee: Astrium LimitedInventor: Simon John Stirland
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Publication number: 20130163705Abstract: A phased array antenna for providing a radiation pattern having at least one communication beam, includes a plurality of antenna elements, each with an antenna element signal having a phase relationship and an amplitude relationship to the other element signals; a digital signal processing arrangement providing a digital beamforming network; and an analogue beamforming network arranged to reduce exposure of the digital signal processing arrangement to an interfering signal. Analogue beamforming weights are selected to generate a null in the radiation pattern in a direction corresponding to the interfering signal.Type: ApplicationFiled: June 22, 2011Publication date: June 27, 2013Applicant: ASTRIUM LIMITEDInventor: Simon John Stirland
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Patent number: 8344945Abstract: A telecommunications satellite having a phased array antenna, wherein the beam-forming function within the phased array is simplified by partitioning it into two stages, in which the sub-array stage relates to a fixed, or infrequently changed, set of overlapping sub-arrays and the main stage provides the main pattern reconfiguration, typically in the form of multiple reconfigurable spot beams within a defined coverage region. The key advantage lies in the significant reduction in number of second stage beam-forming control points (at which independent amplitude and phase is applied) when compared with a conventional phased array (where amplitude and phase control is applied for each element of the array). The sub-array stage beam-forming may be implemented in analogue technology. The main beam-former may be implemented in digital technology, where the key processing functions of A/D or D/A conversion, frequency (de)multiplexing and digital beam-forming all scale with the number of control points.Type: GrantFiled: July 18, 2008Date of Patent: January 1, 2013Assignee: Astrium LimitedInventors: Antony Duncan Craig, Simon John Stirland
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Publication number: 20100295753Abstract: A satellite antenna arrangement for a satellite communication system comprising: a reflector for producing a far field pattern with near-zero field strength at a predetermined location to reject unwanted signals from said predetermined location or minimise signal power transmitted to said predetermined location, the reflector having a surface comprising a stepped profile arranged to generate the near-zero field strength in the predetermined location. The stepped profile may comprise a radial step. The location of the near-zero field strength can be steered by moving the reflector or by adjusting the amplitude and phase of an additional beam that covers substantially the same region as the main beam reflected by the reflector.Type: ApplicationFiled: February 17, 2010Publication date: November 25, 2010Inventors: David Robson, Simon John Stirland
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Publication number: 20100194629Abstract: A telecommunications satellite having a phased array antenna, wherein the beam-forming function within the phased array is simplified by partitioning it into two stages, in which the sub-array stage relates to a fixed, or infrequently changed, set of overlapping sub-arrays and the main stage provides the main pattern reconfiguration, typically in the form of multiple reconfigurable spot beams within a defined coverage region. The key advantage lies in the significant reduction in number of second stage beam-forming control points (at which independent amplitude and phase is applied) when compared with a conventional phased array (where amplitude and phase control is applied for each element of the array). The sub-array stage beam-forming may be implemented in analogue technology. The main beam-former may be implemented in digital technology, where the key processing functions of A/D or D/A conversion, frequency (de)multiplexing and digital beam-forming all scale with the number of control points.Type: ApplicationFiled: July 18, 2008Publication date: August 5, 2010Inventors: Antony Duncan Craig, Simon John Stirland
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Publication number: 20100060546Abstract: A reflector for a reflector antenna is provided for producing a far field pattern with near-zero field strength at a predetermined position, the reflector having a surface comprising a stepped profile for generating the near-zero field strength. The stepped profile may comprise a radial step. The location of the near-zero field strength can be steered by moving the reflector only or by adjusting the amplitude and phase of an additional low resolution beam, produced by, for example, a simple horn, covering the same region.Type: ApplicationFiled: October 8, 2008Publication date: March 11, 2010Inventors: David Robson, Simon John Stirland
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Patent number: 5736963Abstract: The invention relates to a feed device for a multisource semiactive antenna with multiple beams, including:a) a nonorthogonal beam shaper device (65) splitting Nb beam input signals and combining them to form Na output signals,b) Na amplifier modules (64),c) an orthogonal output power splitter (63) arranged between the Na amplifier modules (64) and Ne radiating elements (61).According to the invention, Nb.ltoreq.Na.ltoreq.Ne, and the orthogonal transfer function of the splitter (63) permits change between, on the one hand, Nb distributions at the input of the splitter (63), in which the amplitude of the Na signals is equal for each of the Nb beams, and in which the phase satisfied the condition of equality of the scalar products, taken in pairs, of the Nb excitation vectors at the input of the splitter (63), and of the scalar products, taken in pairs, of the Nb corresponding output excitation vectors and, on the other hand, Nb predetermined output distributions.Appended FIG. 6.Type: GrantFiled: March 19, 1996Date of Patent: April 7, 1998Assignee: Agence Spatiale EuropeenneInventors: Antoine Roederer, Simon John Stirland