Near field antenna for object detecting device
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United States of America Patent
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Dec 15, 2015
Grant Date -
Nov 19, 2015
app pub date -
May 18, 2014
filing date -
May 18, 2014
priority date (Note) -
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Abstract
A near field antenna adapted to an object detecting device, for sensing a plurality of units under test of at least an object under test. The near field antenna comprises a periodic guided-wave structure, a metallic reflection portion and at least two near field magnetic coupling antennas. The periodic guided-wave structure disposed below the object under test has a plurality of conductive units periodically arranged on a first plane. The metallic reflection portion is disposed under the periodic guided-wave structure to form an enclosed space. The near field magnetic coupling antennas are disposed on a second plane parallel to the periodic guided-wave structure, and are located in the enclosed space. The feed point and the ground point of each near field magnetic coupling antenna are fed by a coaxial cable with a feeding direction parallel to the periodically arranged conductive units.
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