Patents by Inventor Ross J. Lahlum

Ross J. Lahlum 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).

  • Counterpoise to mitigate near field radiation generated by wireless communication devices
    Patent number: 8259026
    Abstract: A method (1400) and an RF circuit (100, 400, 700, 1000, 1100, 1200, 1300) for a wireless communication device that mitigates near field radiation generated by the wireless communication device. At least one counterpoise (104, 404, 1304) can be configured to resonate at or near at least one operating frequency of an antenna (102) of the wireless communication device. The antenna can be a component of the RF circuit. The counterpoise can be electromagnetically coupled to the antenna to mitigate near field radiation of the antenna at the at least one operating frequency of the antenna in order to comply with an applicable hearing aid compatibility (HAC) specification.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: September 4, 2012
    Assignee: Motorola Mobility LLC
    Inventors: Narendra Pulimi, Vijay L. Asrani, Ali Ghoreishi, Ross J. Lahlum, Adrian Napoles, Sung-Hoon Oh, Istvan J. Szini
  • COUNTERPOISE TO MITIGATE NEAR FIELD RADIATION GENERATED BY WIRELESS COMMUNICATION DEVICES
    Publication number: 20100164829
    Abstract: A method (1400) and an RF circuit (100, 400, 700, 1000, 1100, 1200, 1300) for a wireless communication device that mitigates near field radiation generated by the wireless communication device. At least one counterpoise (104, 404, 1304) can be configured to resonate at or near at least one operating frequency of an antenna (102) of the wireless communication device. The antenna can be a component of the RF circuit. The counterpoise can be electromagnetically coupled to the antenna to mitigate near field radiation of the antenna at the at least one operating frequency of the antenna in order to comply with an applicable hearing aid compatibility (HAC) specification.
    Type: Application
    Filed: March 31, 2009
    Publication date: July 1, 2010
    Applicant: MOTOROLA, INC.
    Inventors: Narendra Pulimi, Vijay L. Asrani, Ali Ghoreishi, Ross J. Lahlum, Adrian Napoles, Sung-Hoon Oh, Istvan J. Szini
  • Power combiner with harmonic selectivity
    Patent number: 5939939
    Abstract: A power amplifier (517) for amplifying an operating signal includes an amplifier (538), an amplifier (540), and a power combiner (518) with harmonic selectivity. The power combiner (518) includes a transmission line section (541), a transmission line section (545), and a resistor (554). The transmission line section (541) is coupled to an amplifier output of the amplifier (538), and the transmission line section (545) is coupled to an amplifier output of the amplifier (540) and to the transmission line section (541). A capacitor (546) is coupled in parallel to a transmission line section (542) of the transmission line section (541), and a capacitor (548) is coupled in parallel to a transmission line section (544) of the transmission line section (545).
    Type: Grant
    Filed: February 27, 1998
    Date of Patent: August 17, 1999
    Assignee: Motorola, Inc.
    Inventors: Michael P. Gaynor, John E. Lawrence, Ross J. Lahlum, Jr.