Antenna device, and method of manufacturing antenna device
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United States of America Patent
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-
Mar 18, 2008
Grant Date -
Oct 26, 2006
app pub date -
Mar 11, 2004
filing date -
Mar 19, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A loop antenna device includes a loop antenna having a high noise resistance performance. In a loop antenna having a shield member covering a looped conductor portion formed in a loop shape from a conductive wire, a non-covered portion where the looped conductor portion is not covered is formed in correspondence with a portion of the conductive wire including a reference position for the symmetry of two terminals for connection between the antenna device and a reception circuit. This provides a balanced shield structure. Besides, a line for connecting one end of the conductive wire to the ground potential and a line for connecting the shield member to the ground potential are individually separate from each other, whereby reception of a voltage fall due to common impedance by the antenna is suppressed.
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