Patents Examined by Mark Wisler
  • Portable radio apparatus having variable impedance matching circuit between antenna and radio circuit
    Patent number: 5335368
    Abstract: A portable radio apparatus having a casing thereof keeps a matching state of an antenna thereof in the call waiting state and in the operating state of the apparatus. The casing is foldable and expandable and accommodates therein a transmitting and receiving circuit connected via a variable matching circuit to the antenna. The matching circuit is connected to a sensor disposed in the casing for sensing a folded state thereof. Depending on a result of the sensing operation of the sensor, the matching circuit changes the matching state.
    Type: Grant
    Filed: May 29, 1992
    Date of Patent: August 2, 1994
    Assignee: NEC Corporation
    Inventor: Yoshiharu Tamura