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Antenna arrangement for small-sized radio communication devices

  • US 6,005,525 A
  • Filed: 04/09/1998
  • Issued: 12/21/1999
  • Est. Priority Date: 04/11/1997
  • Status: Expired due to Term
First Claim
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1. A radio communication device intended for establishing a two-way connection comprising:

  • first transform means for transforming a received electric signal into a first acoustic signal,means for transmitting the first acoustic signal in a certain direction,means for receiving a second acoustic signal from a certain direction,second transform means for transforming the second acoustic signal into an electric signal,at least one planar antenna element having a certain radiation pattern, said radiation pattern having an amplification maximum of said radiation in a certain direction,said antenna element comprising a planar ground plane having at least, a first radiator on one side of said ground plane and a second radiator on the opposite side of said ground plane, said first and second radiators being arranged essentially parallel to said ground plane,said radio communication device further comprising selection means for performing a selection between said first radiator and said second radiator in order to use one of said radiators at a time as the radiator of the antenna element,and wherein the direction of said amplification maximum of said antenna element when said first radiator is selected is essentially in the direction of said first acoustic signal and wherein the direction of said amplification maximum of said antenna element when said second radiator is selected is in a direction essentially opposite to the direction of said first acoustic signal.

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