| 摘要 |
An antenna is provided including a first loop having at least one first conductor and a second loop having at least one second conductor, the second conductor connected to the first conductor. The first loop has a first enclosed area defined by the area inside the perimeter of the first loop and a first phase center point defined by the geometric center point of the first enclosed area. The second loop is coupled to the first loop and is disposed a distance from and substantially parallel to the first loop. The second loop has a second enclosed area substantially equal to the first enclosed area and a second phase center point. A line normal to the plane of the first loop passes through the first and second phase center points. The first and second loops are disposed to substantially reduce the far-field illumination, while substantially maintaining the near-field illumination at effective radio frequency identification system operational levels. The antenna may be used to energize devices through inductive coupling.
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