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Wireless handset with improved hearing aid compatibility

  • US 7,633,449 B2
  • Filed: 02/29/2008
  • Issued: 12/15/2009
  • Est. Priority Date: 02/29/2008
  • Status: Active Grant
First Claim
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1. A wireless handset comprising:

  • a housing comprising a top end and a bottom end, a front side and a rear side;

    an antenna counterpoise comprising a printed circuit board disposed in said housing between said front side and said rear side wherein said printed circuit board comprises at least one ground plane;

    an earpiece speaker disposed proximate said top end of said housing facing said front side of said housing;

    an internal antenna disposed in said housing proximate said bottom end wherein said internal antenna is coupled to the printed circuit board; and

    a separate field shaping conductor disposed proximate said top end of said housing in spaced relation from said at least one ground plane, wherein said field shaping conductor is coupled to said at least one ground plane by a bridge conductor that extends across to said printed circuit board;

    wherein said bridge conductor is connected to said at least one ground plane through a switch; and

    wherein said internal antenna is tuned to a receive band and said separate field shaping conductor is tuned to provide a resonance in a transmit band and wherein said switch is operable to close upon transmission.

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