Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2004-06-21
2009-02-03
Ferguson, Keith T (Department: 2618)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S575100, C455S550100, C455S090100, C455S090300, C455S553100, C343S7000MS, C343S702000, C343S718000, C343S725000, C343S729000
Reexamination Certificate
active
07486975
ABSTRACT:
An antenna device includes a plurality of radiation elements, at least one or more reactance elements, and a changeover switcher for selectively switching over between one circuit pattern forming a first-type antenna such as a diversity antenna where a predetermined one of the plural radiation elements is used as a feed element, and another circuit pattern forming a second-type antenna such as an ESPAR antenna where one of the plural radiation elements is used as a feed element while the reactance elements are connected to the other radiation element. According to this antenna device, the receiving sensitivity can be improved by using a reduced number of radiation elements in a mobile communication apparatus such as a cellular telephone.
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Office Action from Japanese Patent Office issued on Sep. 26, 2006 for patent application JP 2003-195007.
Ferguson Keith T
Kananen Ronald P.
Rader & Fishman & Grauer, PLLC
Sony Corporation
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