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Surface mount antenna, antenna device using the same, and communication device

  • US 6,950,072 B2
  • Filed: 10/21/2003
  • Issued: 09/27/2005
  • Est. Priority Date: 10/23/2002
  • Status: Expired due to Fees
First Claim
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1. A surface mount antenna comprising a dielectric substrate and a radiation electrode operative to perform an antenna-operation and arranged in a loop-shape so as to be extended over a plurality of surfaces of the dielectric substrate;

  • the radiation electrode including an electric feeding portion disposed on one side thereof and connected to an external circuit, the radiation electrode being branched in a branching portion existing along a path from the electric feeding portion to the other end to define a plurality of branched radiation electrodes;

    one of the branched radiation electrodes being an in-loop branched radiation electrode which is surrounded by a loop-shaped electrode including the radiation electrode portion extended from the electric feeding portion to the branching portion and another branched radiation electrode connected to the radiation electrode portion, the in-loop branched radiation electrode being spaced at an interval from the loop-shaped electrode portion;

    the in-loop branched radiation electrode and the radiation electrode portion extended from the electric feeding portion to the branching portion defining a capacitance therebetween; and

    at least front ends of the respective branched radiation electrodes being arranged on different surfaces of the dielectric substrate.

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