Patents by Inventor Andrew Robert Christie
Andrew Robert Christie 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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Patent number: 9112273Abstract: Among the embodiments disclosed herein is an antenna assembly comprising the combination of a dielectrically loaded antenna and a housing, the housing incorporating a connector for coupling the antenna to host equipment. The antenna comprises an insulative core which has an outer surface and is shaped to define a central axis, and a laminate board on the central axis, the laminate board extending proximally from a proximal core surface portion oriented transversely with respect to the axis. The housing comprises a housing body which forms a hollow conductive shield for the laminate board, and is centered on the antenna axis, and the housing is shaped to provide a mounting surface which, in a cross-sectional plane perpendicular to the axis, defines a periphery of an area in the said plane which area is at least as great as the cross-sectional area of the said proximal portion of the antenna.Type: GrantFiled: January 3, 2013Date of Patent: August 18, 2015Assignee: Harris CorporationInventors: Andrew Robert Christie, Liam Alan Hardy
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Patent number: 8736513Abstract: A backfire dielectrically loaded antenna for operation at a frequency in excess of 200 MHz includes a dielectric core having a relative dielectric constant greater than 5 and having an outer surface defining an interior volume the major part of which is occupied by solid material of the core; a three-dimensional antenna element structure including at least one pair of elongate conductive antenna elements disposed on or adjacent the side surface portion of the core and extending from a distal core surface portion towards a proximal core surface portion; a feed structure having an axially extending elongate laminate board including a transmission line section acting as a feed line which extends through a passage in the core from the distal core surface portion to the proximal core surface portion, and an antenna connection section having an integrally formed proximal extension of the transmission line section the width of which, in the plane of the laminate board, is greater than the width of the passage; and aType: GrantFiled: January 27, 2011Date of Patent: May 27, 2014Assignee: Sarantel LimitedInventors: Andrew Robert Christie, David Michael Wither, Sinikka Lyyra
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Publication number: 20140015726Abstract: Disclosed herein are embodiments of a radiofrequency circuit assemblies and dielectrically-loaded antennas for use in the assembly, the assembly and the antenna being for operation at a frequency in excess of 200 MHz. The disclosed assemblies and antennas should not be construed as limiting in any way. Instead, the present disclosure is directed toward all novel and nonobvious features and aspects of the various disclosed embodiments, alone and in various combinations and subcombinations with one another.Type: ApplicationFiled: July 11, 2013Publication date: January 16, 2014Inventor: Andrew Robert Christie
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Patent number: 8599101Abstract: A radio communication apparatus including: (a) a backfire dielectrically loaded antenna for operation at a frequency in excess of 200 MHz comprising: an electrically insulative dielectric core of a solid material having a relative dielectric constant greater than 5 and having an outer surface including oppositely directed distal and proximal surface portions extending transversely of an axis of the antenna and a side surface portion extending between the transversely extending surface portions, the core outer surface defining an interior volume the major part of which is occupied by the solid material of the core; a three-dimensional antenna element structure including at least one pair of elongate conductive antenna elements disposed on or adjacent the side surface portion of the core and extending from the distal core surface portion towards the proximal core surface portion; a feed structure in the form of an axially extending elongate laminate board comprising at least a transmission line section acting aType: GrantFiled: January 27, 2011Date of Patent: December 3, 2013Assignee: Sarantel LimitedInventors: Andrew Robert Christie, David Michael Wither, Martyn Leslie Tongue, Frank Kwasi Frimpong
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Patent number: 8212738Abstract: A dielectrically-loaded helical antenna has a cylindrical ceramic core bearing metallised helical antenna elements which are coupled to a coaxial feeder structure passing axially through the core. Secured to the end face of the core is an impedance matching section in the form of a laminate board. The matching section embodies a shunt capacitance and a series inductance.Type: GrantFiled: March 15, 2010Date of Patent: July 3, 2012Assignee: Sarantel LimitedInventors: Oliver Paul Leisten, Andrew Robert Christie, Thomas Alan Clupper, John J Squires
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Patent number: 8207905Abstract: A dielectrically-loaded helical antenna has a cylindrical ceramic core bearing metallised helical antenna elements which are coupled to a coaxial feeder structure passing axially through the core. Secured to the end face of the core is an impedance matching section in the form of a laminate board. The matching section embodies a shunt capacitance and a series inductance.Type: GrantFiled: October 7, 2011Date of Patent: June 26, 2012Assignee: Sarantel LimitedInventors: Oliver Paul Leisten, Andrew Robert Christie, Thomas Alan Clupper, John J Squires
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Publication number: 20120032871Abstract: A dielectrically-loaded helical antenna has a cylindrical ceramic core bearing metallised helical antenna elements which are coupled to a coaxial feeder structure passing axially through the core. Secured to the end face of the core is an impedance matching section in the form of a laminate board. The matching section embodies a shunt capacitance and a series inductance.Type: ApplicationFiled: October 7, 2011Publication date: February 9, 2012Inventors: Oliver Paul Leisten, Andrew Robert Christie, Thomas Alan Clupper, John J. Squires
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Publication number: 20110221651Abstract: A radio communication apparatus including: (a) a backfire dielectrically loaded antenna for operation at a frequency in excess of 200 MHz comprising: an electrically insulative dielectric core of a solid material having a relative dielectric constant greater than 5 and having an outer surface including oppositely directed distal and proximal surface portions extending transversely of an axis of the antenna and a side surface portion extending between the transversely extending surface portions, the core outer surface defining an interior volume the major part of which is occupied by the solid material of the core; a three-dimensional antenna element structure including at least one pair of elongate conductive antenna elements disposed on or adjacent the side surface portion of the core and extending from the distal core surface portion towards the proximal core surface portion; a feed structure in the form of an axially extending elongate laminate board comprising at least a transmission line section acting aType: ApplicationFiled: January 27, 2011Publication date: September 15, 2011Inventors: Andrew Robert Christie, David Michael Wither, Martyn Leslie Tongue, Frank Kwasi Frimpong
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Publication number: 20110221650Abstract: A backfire dielectrically loaded antenna for operation at a frequency in excess of 200 MHz includes a dielectric core having a relative dielectric constant greater than 5 and having an outer surface defining an interior volume the major part of which is occupied by solid material of the core; a three-dimensional antenna element structure including at least one pair of elongate conductive antenna elements disposed on or adjacent the side surface portion of the core and extending from a distal core surface portion towards a proximal core surface portion; a feed structure having an axially extending elongate laminate board including a transmission line section acting as a feed line which extends through a passage in the core from the distal core surface portion to the proximal core surface portion, and an antenna connection section having an integrally formed proximal extension of the transmission line section the width of which, in the plane of the laminate board, is greater than the width of the passage; and aType: ApplicationFiled: January 27, 2011Publication date: September 15, 2011Inventors: Andrew Robert Christie, David Michael Wither, Sinikka Lyyra
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Publication number: 20100177015Abstract: A dielectrically-loaded helical antenna has a cylindrical ceramic core bearing metallised helical antenna elements which are coupled to a coaxial feeder structure passing axially through the core. Secured to the end face of the core is an impedance matching section in the form of a laminate board. The matching section embodies a shunt capacitance and a series inductance.Type: ApplicationFiled: March 15, 2010Publication date: July 15, 2010Inventors: Oliver Paul Leisten, Andrew Robert Christie, Thomas Alan Clupper, John J. Squires
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Patent number: 7633459Abstract: A dielectrically-loaded helical antenna has a ceramic cylindrical core and, formed on the cylindrical surface of the core, a plurality of conductive helical antenna elements. The antenna elements are coupled to a pair of feed connection conductors generally centrally located on an end surface of the core, the coupling between the antenna elements and the feed connection conductors being by way of a matching section comprising a laminate board having at least three conductive layers and insulative layers between the conductive layers arranged in an alternating manner. Each conductive layer has a first portion forming part of a respective shunt capacitance, the conductive layers and the insulative layers together acting to form a plurality of capacitors shunt-connected across the antenna elements. One of the conductive layers includes a second portion forming a series inductance between one of the feed connection conductors and at least one of the antenna elements.Type: GrantFiled: September 4, 2007Date of Patent: December 15, 2009Assignee: Sarantel LimitedInventors: Andrew Robert Christie, Oliver Paul Leisten
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Patent number: 7439934Abstract: A dielectrically-loaded helical antenna has a cylindrical ceramic core bearing metallised helical antenna elements which are coupled to a coaxial feeder structure passing axially through the core. Secured to the end face of the core is an impedance matching section in the form of a laminate board. The matching section embodies a shunt capacitance and a series inductance.Type: GrantFiled: June 21, 2006Date of Patent: October 21, 2008Assignee: Sarantel LimitedInventors: Oliver Paul Leisten, Andrew Robert Christie, Thomas Alan Clupper, John J Squires