Patents by Inventor Corbett R. Rowell

Corbett R. Rowell 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).

  • Patent number: 8890750
    Abstract: Systems and methods which utilize a symmetrical partially coupled microstrip slot feed patch antenna element configuration to provide highly decoupled dual-polarized wideband patch antenna elements are shown. Embodiments provide a microstrip slot feed configuration in which a slot of a first signal feed is centered with respect to the patch and further provide a microstrip slot feed configuration in which slots of a second signal feed are symmetrically disposed with respect to the center of the patch and at positions near the edges of the patch. The microstrip feed utilized in communicating signals with respect to the slots of the second signal feed is adapted to provide signals of substantially equal amplitude and 180° out of phase with respect to each other according to embodiments. The second signal feed configuration utilized according to embodiments provides partial coupling between the patch and the second signal feed.
    Type: Grant
    Filed: September 9, 2011
    Date of Patent: November 18, 2014
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Angus C. K. Mak, Corbett R. Rowell, Hau Wah Lai
  • Patent number: 8847702
    Abstract: Systems and methods which utilizes a stub array microstrip line for providing a phase shifter configuration are shown. A stub array microstrip line phase shifter of embodiments may comprises a microstrip line structure, an isolation structure, and a phase tuning structure cooperative to provide phase shifting of signals passed through the microstrip line structure. A microstrip line structure comprises a stub array microstrip line having a plurality of microstrip stubs provided in association with a slotted ground plane having a plurality of slots. The stub array microstrip line is adapted to provide compensation for capacitance and/or inductance associated with the slots of the slotted ground plane. A phase tuning structure provides coupling of signals transmitted by the stub array microstrip line to the slots of the slotted ground plane for signal phase shifting.
    Type: Grant
    Filed: September 26, 2011
    Date of Patent: September 30, 2014
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Hau Wah Lai, Angus C. K. Mak, Corbett R. Rowell
  • Publication number: 20130120209
    Abstract: Systems and methods which utilize a current null cut reflector dipole antenna configuration are shown. According to embodiments, a plurality of current null points are identified with respect to an antenna element reflector configuration whereby a reflector is provided which terminates at the identified current null points. Accordingly, a noncontiguous reflector is provided in current null cut reflector dipole antenna elements. The discontinuity in the noncontiguous reflector is utilized for disposing signal feed paths providing a feed network to the dipole antenna element of the current null cut reflector dipole antenna. Accordingly, current null cut reflector dipole antennas of embodiments may be provided in configurations which are relatively simple and inexpensive to manufacture, such as two-sided printed circuit board configurations.
    Type: Application
    Filed: November 15, 2011
    Publication date: May 16, 2013
    Applicant: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Angus C.K. Mak, Corbett R. Rowell
  • Patent number: 8421683
    Abstract: An antenna system comprises a ground plane, a flexible substrate, a first antenna element disposed upon the flexible substrate and proximal to the ground plane, the flexible substrate configured so as to be at least partially rolled, and a Radio Frequency (RF) module in communication with the first antenna element and transmitting and receiving radio waves through the first antenna element.
    Type: Grant
    Filed: June 25, 2009
    Date of Patent: April 16, 2013
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Chi Lun Mak, Hau Wah Lai, Corbett R. Rowell
  • Publication number: 20130076453
    Abstract: Systems and methods which utilizes a stub array microstrip line for providing a phase shifter configuration are shown. A stub array microstrip line phase shifter of embodiments may comprises a microstrip line structure, an isolation structure, and a phase tuning structure cooperative to provide phase shifting of signals passed through the microstrip line structure. A microstrip line structure comprises a stub array microstrip line having a plurality of microstrip stubs provided in association with a slotted ground plane having a plurality of slots. The stub array microstrip line is adapted to provide compensation for capacitance and/or inductance associated with the slots of the slotted ground plane. A phase tuning structure provides coupling of signals transmitted by the stub array microstrip line to the slots of the slotted ground plane for signal phase shifting.
    Type: Application
    Filed: September 26, 2011
    Publication date: March 28, 2013
    Applicant: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Hau W. Lai, Angus C. K. Mak, Corbett R. Rowell
  • Publication number: 20130063310
    Abstract: Systems and methods which utilize a symmetrical partially coupled microstrip slot feed patch antenna element configuration to provide highly decoupled dual-polarized wideband patch antenna elements are shown. Embodiments provide a microstrip slot feed configuration in which a slot of a first signal feed is centered with respect to the patch and further provide a microstrip slot feed configuration in which slots of a second signal feed are symmetrically disposed with respect to the center of the patch and at positions near the edges of the patch. The microstrip feed utilized in communicating signals with respect to the slots of the second signal feed is adapted to provide signals of substantially equal amplitude and 180° out of phase with respect to each other according to embodiments. The second signal feed configuration utilized according to embodiments provides partial coupling between the patch and the second signal feed.
    Type: Application
    Filed: September 9, 2011
    Publication date: March 14, 2013
    Applicant: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Angus C. K. Mak, Corbett R. Rowell, Hau Wah Lai
  • Patent number: 8238989
    Abstract: A Radio Frequency (RF) component comprising a non-superconducting material, and a superconducting material, wherein the superconducting material is disposed in one or more areas of the RF component such that the areas with superconducting material conduct greater current density than do areas with the non-superconducting material.
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: August 7, 2012
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventor: Corbett R. Rowell
  • Patent number: 8056819
    Abstract: A near field apparatus comprises a Radio Frequency (RF) coil including at least one of a shorting bridge from a first point to a second point along an electrical path of the RF coil and/or a discontinuity in the electrical path of the RF coil.
    Type: Grant
    Filed: October 14, 2008
    Date of Patent: November 15, 2011
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Corbett R. Rowell, Hau-Wah Lai, Chi-Lun Mak
  • Patent number: 7973718
    Abstract: An antenna system comprises a first antenna element mutually coupled with a second antenna element, the mutual coupling between the first and second antenna elements causing a first current in the second antenna element, and a coupling element disposed at least partially between the first and second antenna elements, wherein the coupling element is mutually coupled to each of the first and second antenna elements, and wherein the coupling element is configured to induce a second current in the second antenna element that at least partially cancels the first current.
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: July 5, 2011
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Angus C. K. Mak, Corbett R. Rowell, Chi-Lun Mak
  • Patent number: 7924225
    Abstract: An antenna system comprising a first antenna element, a second antenna element, and a parasitic element, wherein the parasitic element is arranged with regard to the first antenna element and the second antenna element such that a greatest difference in gain between respective antenna patterns of the first and second antenna elements occurs at a null of the pattern of the first antenna element.
    Type: Grant
    Filed: June 23, 2008
    Date of Patent: April 12, 2011
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Angus C. K. Mak, Corbett R. Rowell, Chi-Lun Mak
  • Publication number: 20110012788
    Abstract: An antenna system comprising a ground plane, an antenna element folded under itself and operable to transmit and receive circularly polarized signals, an air filled cavity disposed between the ground plane and the antenna element, and a radio frequency module in communication with the antenna element.
    Type: Application
    Filed: July 14, 2009
    Publication date: January 20, 2011
    Applicant: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Corbett R. Rowell, Hau Wah Lai
  • Publication number: 20100328171
    Abstract: An antenna system comprises a ground plane, a flexible substrate, a first antenna element disposed upon the flexible substrate and proximal to the ground plane, the flexible substrate configured so as to be at least partially rolled, and a Radio Frequency (RF) module in communication with the first antenna element and transmitting and receiving radio waves through the first antenna element.
    Type: Application
    Filed: June 25, 2009
    Publication date: December 30, 2010
    Applicant: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Chi Lun Mak, Hau Wah Lai, Corbett R. Rowell
  • Patent number: 7812783
    Abstract: A system for providing multiple antenna patterns comprises a first antenna element, a second antenna element, wherein the first and second antenna elements are coplanar and arranged orthogonally with respect to each other in the plane, and a feed circuit in communication with a signal feed line alternately connecting the signal feed line to each of the first and second antenna elements.
    Type: Grant
    Filed: December 18, 2006
    Date of Patent: October 12, 2010
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Chi Lun Mak, Corbett R. Rowell
  • Patent number: 7772941
    Abstract: A balun comprises at least two asymmetric coplanar striplines, a first of the striplines coupled to a signal input, and a second of the striplines coupled to a signal output, the at least two asymmetric coplanar striplines configured in a Marchand architecture to receive an unbalanced signal and to output a balanced signal.
    Type: Grant
    Filed: June 12, 2008
    Date of Patent: August 10, 2010
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Lap-Kun Yeung, Angus C. K. Mak, Corbett R. Rowell
  • Publication number: 20100090824
    Abstract: A near field apparatus comprises a Radio Frequency (RF) coil including at least one of a shorting bridge from a first point to a second point along an electrical path of the RF coil and/or a discontinuity in the electrical path of the RF coil.
    Type: Application
    Filed: October 14, 2008
    Publication date: April 15, 2010
    Applicant: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Corbett R. Rowell, Hau-Wah Lai, Chi-Lun Mak
  • Publication number: 20100053022
    Abstract: An antenna system comprises a first antenna element mutually coupled with a second antenna element, the mutual coupling between the first and second antenna elements causing a first current in the second antenna element, and a coupling element disposed at least partially between the first and second antenna elements, wherein the coupling element is mutually coupled to each of the first and second antenna elements, and wherein the coupling element is configured to induce a second current in the second antenna element that at least partially cancels the first current.
    Type: Application
    Filed: August 28, 2008
    Publication date: March 4, 2010
    Applicant: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Angus C. K. Mak, Corbett R. Rowell, Chi-Lun Mak
  • Publication number: 20100053456
    Abstract: A mobile device comprises a main compartment, a flip cover coupled to the main compartment, wherein the main compartment includes a Radio Frequency (RF) feed and ground, and wherein the flip cover includes at least one multiband antenna system in communication with the RF feed and ground, the antenna operating in at least one television broadcast band.
    Type: Application
    Filed: August 28, 2008
    Publication date: March 4, 2010
    Applicant: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Corbett R. Rowell, Chi-Lun Mak, Angus C.K. Mak
  • Publication number: 20100056379
    Abstract: A Radio Frequency (RF) component comprising a non-superconducting material, and a superconducting material, wherein the superconducting material is disposed in one or more areas of the RF component such that the areas with superconducting material conduct greater current density than do areas with the non-superconducting material.
    Type: Application
    Filed: August 28, 2008
    Publication date: March 4, 2010
    Applicant: Hong Kong Applied Science and Technologies Research Institute Co., Ltd.
    Inventor: Corbett R. Rowell
  • Publication number: 20090315759
    Abstract: An antenna system comprising a first antenna element, a second antenna element, and a parasitic element, wherein the parasitic element is arranged with regard to the first antenna element and the second antenna element such that a greatest difference in gain between respective antenna patterns of the first and second antenna elements occurs at a null of the pattern of the first antenna element.
    Type: Application
    Filed: June 23, 2008
    Publication date: December 24, 2009
    Applicant: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Angus C. K. Mak, Corbett R. Rowell, Chi-Lun Mak
  • Publication number: 20090309672
    Abstract: A balun comprises at least two asymmetric coplanar striplines, a first of the striplines coupled to a signal input, and a second of the striplines coupled to a signal output, the at least two asymmetric coplanar striplines configured in a Marchand architecture to receive an unbalanced signal and to output a balanced signal.
    Type: Application
    Filed: June 12, 2008
    Publication date: December 17, 2009
    Applicant: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Lap-Kun Yeung, Angus C.K. Mak, Corbett R. Rowell