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Multi-band monopole antenna for a mobile communications device

  • US 8,259,016 B2
  • Filed: 02/17/2011
  • Issued: 09/04/2012
  • Est. Priority Date: 12/22/2002
  • Status: Expired due to Term
First Claim
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1. A clamshell-type multi-band mobile communications device comprising:

  • an upper circuit board;

    a lower circuit board comprising a ground plane, a feeding point and communications circuitry;

    a multi-band antenna connected to the communications circuitry and mounted on the lower circuit board, the multi-band antenna having a common conductor connected to the feeding point for coupling the multi-band antenna to the communications circuitry in the mobile communications device;

    a first radiating arm coupled to the common conductor;

    a second radiating arm coupled to the common conductor;

    an upper housing and a lower housing hinged to one another, the upper housing enclosing the upper circuit board and the lower housing enclosing the lower circuit board and the multi-band antenna, the upper and lower housings enabling the upper and lower housings and the upper and lower circuit boards to be selectively folded together into a clamshell configuration or opened into a communications configuration;

    wherein the lower circuit board is connected to the upper circuit board via a hinge enabling the upper and lower circuit boards to be folded together into a closed position;

    wherein a projection of an antenna footprint on a plane of the lower circuit board does not intersect a metallization of the ground plane by more than fifty percent; and

    wherein the lower circuit board is mounted in a first plane within the mobile communications device and the multi-band monopole antenna is mounted in a second plane within the mobile communications device.

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