Patents by Inventor Nicolaos G. Alexopoulos
Nicolaos G. Alexopoulos 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: 8018375Abstract: A projected artificial magnetic mirror (PAMM) radar device includes a transceiver module, a shaping module, and an antenna structure. The antenna structure includes a plurality of metal patches, a metal backing, a dielectric material, and one or more antennas. The metal patches are electrically coupled to the metal backing to form an inductive-capacitive network that, for the one or more antennas and within a given frequency band, substantially reduces surface waves to obtain a detectable angle of incidence of approximately ninety degrees.Type: GrantFiled: February 28, 2011Date of Patent: September 13, 2011Assignee: Broadcom CorporationInventors: Nicolaos G. Alexopoulos, Chryssoula A. Kyriazidou
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Publication number: 20110188552Abstract: A dongle transceiver a substrate, a transceiver circuit, a transmit/receive switch, a MIMO antenna structure, and a decoupling module. The transceiver circuit is on at least one of the first and second sides of the substrate and is coupled to the transmit/receive switch. The MIMO antenna structure is on at least one of the first and second sides of the substrate. The decoupling module is on at least one of the first and second sides of the substrate, couples the MIMO antenna structure to the transmit/receive switch, and electrically isolates antennas of the MIMO antenna structure.Type: ApplicationFiled: January 6, 2011Publication date: August 4, 2011Applicant: BROADCOM CORPORATIONInventors: SEUNGHWAN YOON, NICOLAOS G. ALEXOPOULOS, JESUS CASTANEDA
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Publication number: 20110150140Abstract: A filter includes a first port, a second port, a first fractal curve based filter element coupled to the first port, and a second fractal curve based filter element coupled to the second port. The first fractal curve based filter element has first electromagnetic properties and the second fractal curve based filter element has second electromagnetic properties. The first fractal curve based filter element is electromagnetically coupled to the second fractal curve based filter element to filter radio frequency (RF) signals.Type: ApplicationFiled: February 21, 2011Publication date: June 23, 2011Applicant: BROADCOM CORPORATIONInventors: Nicolaos G. Alexopoulos, Seunghwan Yoon
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Publication number: 20110095948Abstract: A three-dimensional antenna structure includes first and second antenna components and a via. The first antenna component is on a first layer of a substrate and the second antenna component is on a second layer of a substrate. The via couples the first antenna component to the second antenna component, wherein the first antenna overlaps, from a radial perspective, the second antenna component by an angle of overlap.Type: ApplicationFiled: January 5, 2011Publication date: April 28, 2011Applicant: BROADCOM CORPORATIONInventors: Nicolaos G. Alexopoulos, Yunhong Liu
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Publication number: 20100220022Abstract: A multiple antenna apparatus includes a substrate, a first antenna structure, and a second antenna structure. The first antenna structure includes a first metal trace that has a first pattern confined in a first geometric shape and has a near-zero electric field plane. The second antenna structure includes a second metal trace that has a first pattern confined to a second geometric shape. The second antenna structure is positioned on the substrate in substantial alignment with the near-zero electric field plane of the first antenna structure.Type: ApplicationFiled: April 30, 2010Publication date: September 2, 2010Applicant: BROADCOM CORPORATIONInventors: Seunghwan Yoon, Nicolaos G. Alexopoulos
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Publication number: 20100177001Abstract: An antenna apparatus includes a substrate and an antenna structure. The antenna structure includes a metal trace and a terminal. The metal trace has a modified Polya curve shape that is confined in a polygonal shape. The terminal is coupled to the metal trace.Type: ApplicationFiled: December 18, 2009Publication date: July 15, 2010Applicant: BROADCOM CORPORATIONInventors: NICOLAOS G. ALEXOPOULOS, YUNHONG LIU, SEUNGHWAN YOON
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Publication number: 20100151810Abstract: A receiver includes an antenna array, an angular positioning module, a low noise amplifier module, and a down conversion module. The antenna array is operable to receive an inbound wireless signal. The angular positioning module is operable to: receive a plurality of received inbound wireless signals from the antenna array; determine angular position of a source of the inbound wireless signal from at least some of the plurality of received inbound wireless signals based on a first radiation pattern and a second radiation pattern of the plurality of received inbound wireless signals; and output a representation of the inbound wireless signal. The low noise amplifier module is operably coupled to amplify the representation of the inbound wireless signal to produce an amplified inbound wireless signal. The down conversion module is operably coupled to convert the amplified inbound wireless signal into a baseband or near baseband signal.Type: ApplicationFiled: May 30, 2009Publication date: June 17, 2010Applicant: BROADCOM CORPORATIONInventors: ALFRED GRAU BESOLI, NICOLAOS G. ALEXOPOULOS, JESUS CASTANEDA
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Publication number: 20100151784Abstract: A receiver includes an antenna array, a plurality of phase shifters, a matrix module, a low noise amplifier module, and a down conversion module. The antenna array is operably coupled to receive an inbound wireless signal. The plurality of phase shifters is operably coupled to the antenna array and to produce a plurality of phase shifted inbound wireless signals. The matrix module is operably coupled to beamform the plurality of phase shifted inbound wireless signals to produce a plurality of beamformed and phase shifted inbound wireless signals. The low noise amplifier module is operably coupled to amplify one or more of the plurality of beamformed and phase shifted inbound wireless signals to produce one or more amplified inbound signals. The down conversion module is operably coupled to convert the one or more amplified inbound wireless signals into one or more baseband or near baseband signals.Type: ApplicationFiled: May 30, 2009Publication date: June 17, 2010Applicant: BROADCOM CORPORATIONInventors: ALFRED GRAU BESOLI, NICOLAOS G. ALEXOPOULOS, JESUS CASTANEDA
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Patent number: 7116202Abstract: An inductor circuit includes a magnetic interface generator that generates a magnetic interface at a center frequency f0. The magnetic interface generator is a passive array of spirals that are deposited on one layer of a multi-layer substrate. The magnetic interface is generated in a plane at a distance Z above the surface of the substrate layer that it is printed on, where the antenna is printed on a second layer of the multi-layer substrate. The distance Z where the magnetic interface is created is determined by the cell size of the spiral array, where the cell size is based on the spiral arm length and the spacing S between the spirals. The center frequency of the magnetic interface is determined by the average track length DAV of the spirals in the spiral array. The spacing S of the spiral array is chosen to project the magnetic interface to the second layer in the multi-layer substrate so as to effect performance of an inductor that printed on the second layer.Type: GrantFiled: January 28, 2005Date of Patent: October 3, 2006Assignee: Broadcom CorporationInventors: Nicolaos G. Alexopoulos, Harry Contopanagos, Chryssoula Kyriazidou
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Patent number: 7109947Abstract: A magnetic interface generator generates a magnetic interface at a center frequency f0. The magnetic interface generator is a passive array of spirals that are deposited on a substrate surface. The magnetic interface is generated in a plane at a distance Z above the surface of the substrate. The distance Z where the magnetic interface is created is determined by the cell size of the spiral array, where the cell size is based on the spiral arm length and the spacing S between the spirals. The center frequency of the magnetic interface is determined by the average track length DAV of the spirals in the spiral array. In embodiments, the spiral array is one sub-layer in a multi-layer substrate. The spacing S of the spiral array is chosen to project the magnetic interface to another layer in the multi-layer substrate so as to improve performance of a circuit in the plane of the magnetic interface.Type: GrantFiled: March 29, 2005Date of Patent: September 19, 2006Assignee: Broadcom CorporationInventors: Nicolaos G. Alexopoulos, Harry Contopanagos, Chryssoula Kyriazidou
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Patent number: 6947010Abstract: A system includes a support device and an elongated spiral antenna coupled to the support device. The elongated spiral antenna has a contracted portion and an expanded portion. The expanded portion provides beam steering and directivity. The system also includes a feed line coupled to the elongated spiral antenna. A method for forming the elongated spiral antenna uses a predetermined formula to form arms of the elongated spiral antenna. The arms can be formed by printing the arms on a printed circuit board.Type: GrantFiled: December 3, 2004Date of Patent: September 20, 2005Assignee: Broadcom CorporationInventors: Nicolaos G. Alexopoulos, Franco De Flaviis, Jesus Alfonso Castaneda
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Patent number: 6906682Abstract: A magnetic interface generator generates a magnetic interface at a center frequency f0. The magnetic interface generator is a passive array of spirals that are deposited on a substrate surface. The magnetic interface is generated in a plane at a distance Z above the surface of the substrate. The distance Z where the magnetic interface is created is determined by the cell size of the spiral array, where the cell size is based on the spiral arm length and the spacing S between the spirals. The center frequency of the magnetic interface is determined by the average track length DAV of the spirals in the spiral array. In embodiments, the spiral array is one sub-layer in a multi-layer substrate. The spacing S of the spiral array is chosen to project the magnetic interface to another layer in the multi-layer substrate so as to improve performance of a circuit in the plane of the magnetic interface.Type: GrantFiled: August 23, 2002Date of Patent: June 14, 2005Assignee: Broadcom CorporationInventors: Nicolaos G. Alexopoulos, Harry Contopanagos, Chryssoula Kyriazidou
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Patent number: 6862004Abstract: A system includes a support device and an elongated spiral antenna coupled to the support device. The elongated spiral antenna has a contracted portion and an expanded portion. The expanded portion provides beam steering and directivity. The system also includes a feed line coupled to the elongated spiral antenna. A method for forming the elongated spiral antenna uses a predetermined formula to form arms of the elongated spiral antenna. The arms can be formed by printing the arms on a printed circuit board.Type: GrantFiled: February 6, 2003Date of Patent: March 1, 2005Assignee: Broadcom CorporationInventors: Nicolaos G. Alexopoulos, Franco De Flaviis, Jesus Alfonso Castaneda
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Patent number: 6853350Abstract: An antenna includes a magnetic interface generator that generates a magnetic interface at a center frequency f0. The magnetic interface generator is a passive array of spirals that are deposited on one layer of a multi-layer substrate. The magnetic interface is generated in a plane at a distance Z above the surface of the substrate layer that it is printed on, where the antenna in printed on a second layer of the multi-layer substrate. The distance Z where the magnetic interface is created is determined by the cell size of the spiral array, where the cell size is based on the spiral arm length and the spacing S between the spirals. The center frequency of the magnetic interface is determined by the average track length DAV of the spirals in the spiral array. The spacing S of the spiral array is chosen to project the magnetic interface to the second layer in the multi-layer substrate so as to improve performance of the antenna that printed on the second layer.Type: GrantFiled: August 23, 2002Date of Patent: February 8, 2005Assignee: Broadcom CorporationInventors: Nicolaos G. Alexopoulos, Harry Contopanagos, Chryssoula Kyriazidou
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Patent number: 6768472Abstract: A signal sensing module senses an RF signal and produces one or more secondary signals representative of the RF signal. An impedance matching control module generates a control signal, based on the one or more secondary signals, which is indicative of an impedance mismatch between a load and a communications device. The control signal is then applied to at least one variable impedance device to adjust the impedance of an impedance matching network and thereby reduce the impedance mismatch between the load and the communications device. In an embodiment, the at least one variable impedance device is a barium strontium titanate, thin film, parallel plate capacitor. In other embodiments, other variable impedance devices such as other types of thin film capacitors or varactor diodes are used to adjust the impedance of the impedance matching network.Type: GrantFiled: May 23, 2003Date of Patent: July 27, 2004Assignee: Broadcom CorporationInventors: Nicolaos G. Alexopoulos, Franco De Flaviis
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Publication number: 20040113862Abstract: A system includes a support device and an elongated spiral antenna coupled to the support device. The elongated spiral antenna has a contracted portion and an expanded portion. The expanded portion provides beam steering and directivity. The system also includes a feed line coupled to the elongated spiral antenna. A method for forming the elongated spiral antenna uses a predetermined formula to form arms of the elongated spiral antenna. The arms can be formed by printing the arms on a printed circuit board.Type: ApplicationFiled: February 6, 2003Publication date: June 17, 2004Applicant: Broadcom CorporationInventors: Nicolaos G. Alexopoulos, Franco De Flaviis, Jesus Alfonso Castaneda
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Publication number: 20030206141Abstract: A signal sensing module senses an RF signal and produces one or more secondary signals representative of the RF signal. An impedance matching control module generates a control signal, based on the one or more secondary signals, which is indicative of an impedance mismatch between a load and a communications device. The control signal is then applied to at least one variable impedance device to adjust the impedance of an impedance matching network and thereby reduce the impedance mismatch between the load and the communications device. In an embodiment, the at least one variable impedance device is a barium strontium titanate, thin film, parallel plate capacitor. In other embodiments, other variable impedance devices such as other types of thin film capacitors or varactor diodes are used to adjust the impedance of the impedance matching network.Type: ApplicationFiled: May 23, 2003Publication date: November 6, 2003Applicant: Broadcom CorporationInventors: Nicolaos G. Alexopoulos, Franco De Flaviis
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Patent number: 6608603Abstract: A signal sensing module senses an RF signal and produces one or more secondary signals representative of the RF signal. An impedance matching control module generates a control signal, based on the one or more secondary signals, which is indicative of an impedance mismatch between a load and a communications device. The control signal is then applied to at least one variable impedance device to adjust the impedance of an impedance matching network and thereby reduce the impedance mismatch between the load and the communications device. In an embodiment, the at least one variable impedance device is a barium strontium titanate, thin film, parallel plate capacitor. In other embodiments, other variable impedance devices such as other types of thin film capacitors or varactor diodes are be used to adjust the impedance of the impedance matching network.Type: GrantFiled: August 24, 2001Date of Patent: August 19, 2003Assignee: Broadcom CorporationInventors: Nicolaos G. Alexopoulos, Franco De Flaviis
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Publication number: 20030052832Abstract: A signal sensing module senses an RF signal and produces one or more secondary signals representative of the RF signal. An impedance matching control module generates a control signal, based on the one or more secondary signals, which is indicative of an impedance mismatch between a load and a communications device. The control signal is then applied to at least one variable impedance device to adjust the impedance of an impedance matching network and thereby reduce the impedance mismatch between the load and the communications device. In an embodiment, the at least one variable impedance device is a barium strontium titanate, thin film, parallel plate capacitor. In other embodiments, other variable impedance devices such as other types of thin film capacitors or varactor diodes are be used to adjust the impedance of the impedance matching network.Type: ApplicationFiled: August 24, 2001Publication date: March 20, 2003Applicant: Broadcom CorporationInventors: Nicolaos G. Alexopoulos, Franco DeFlaviis
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Publication number: 20030048234Abstract: An antenna includes a magnetic interface generator that generates a magnetic interface at a center frequency f0. The magnetic interface generator is a passive array of spirals that are deposited on one layer of a multi-layer substrate. The magnetic interface is generated in a plane at a distance Z above the surface of the substrate layer that it is printed on, where the antenna in printed on a second layer of the multi-layer substrate. The distance Z where the magnetic interface is created is determined by the cell size of the spiral array, where the cell size is based on the spiral arm length and the spacing S between the spirals. The center frequency of the magnetic interface is determined by the average track length DAV of the spirals in the spiral array. The spacing S of the spiral array is chosen to project the magnetic interface to the second layer in the multi-layer substrate so as to improve performance of the antenna that printed on the second layer.Type: ApplicationFiled: August 23, 2002Publication date: March 13, 2003Applicant: Broadcom CorporationInventors: Nicolaos G. Alexopoulos, Harry Contopanagos, Chryssoula Kyriazidou