Near field antenna for object detecting device
First Claim
1. A near field antenna utilized for an object detecting device, for sensing a plurality of units under test of at least an object under test, the object under test having a plurality of surfaces, each surface of the object under test disposed with at least one unit under test, the near field antenna comprising:
- a periodic guided-wave structure, disposed below the object under test, having a plurality of conductive units periodically arranged on a first plane;
a metallic reflection portion, disposed under the periodic guided-wave structure, the metallic reflection portion and the periodic guided-wave structure forming an enclosed space; and
two near field magnetic coupling antennas, disposed on a second plane parallel to the periodic guided-wave structure, located in the enclosed space formed by the metallic reflection portion and the periodic guided-wave structure, the two near field magnetic coupling antennas respectively located in two sides of a symmetrical center on the second plane, the distances from each of the near field magnetic coupling antennas to the symmetrical center being the same, each near field magnetic coupling antenna comprising;
a plurality of annularly arranged radiators, with a first gap formed between any two adjacent radiators; and
an annular conductive portion, having a plurality of annular conductive segments, each annular conductive segment partially overlapping two adjacent radiators, with a second gap formed between the two adjacent annular conductive segments and the annular conductive portion surrounding the radiators;
wherein the two adjacent radiators are associated with a feed point and a ground point, and the feed point and the ground point are defined in the neighborhood of the first gap between the two adjacent radiators;
wherein the feed point and the ground point of one of the two near field magnetic coupling antennas are fed by a first coaxial cable with a first feeding direction, the feed point and the ground point of another one of the two near field magnetic coupling antennas are fed by a second coaxial cable with a second feeding direction, the first feeding direction and the second feeding direction are parallel to the periodically arranged conductive units, and the first feeding direction and the second feeding direction are opposite directions;
wherein an angle formed by a line segment connecting the two near field magnetic coupling antennas and the periodically arranged conductive units is between 30 degrees and 50 degrees.
1 Assignment
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Accused Products
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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Citations
14 Claims
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1. A near field antenna utilized for an object detecting device, for sensing a plurality of units under test of at least an object under test, the object under test having a plurality of surfaces, each surface of the object under test disposed with at least one unit under test, the near field antenna comprising:
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a periodic guided-wave structure, disposed below the object under test, having a plurality of conductive units periodically arranged on a first plane; a metallic reflection portion, disposed under the periodic guided-wave structure, the metallic reflection portion and the periodic guided-wave structure forming an enclosed space; and two near field magnetic coupling antennas, disposed on a second plane parallel to the periodic guided-wave structure, located in the enclosed space formed by the metallic reflection portion and the periodic guided-wave structure, the two near field magnetic coupling antennas respectively located in two sides of a symmetrical center on the second plane, the distances from each of the near field magnetic coupling antennas to the symmetrical center being the same, each near field magnetic coupling antenna comprising; a plurality of annularly arranged radiators, with a first gap formed between any two adjacent radiators; and an annular conductive portion, having a plurality of annular conductive segments, each annular conductive segment partially overlapping two adjacent radiators, with a second gap formed between the two adjacent annular conductive segments and the annular conductive portion surrounding the radiators; wherein the two adjacent radiators are associated with a feed point and a ground point, and the feed point and the ground point are defined in the neighborhood of the first gap between the two adjacent radiators; wherein the feed point and the ground point of one of the two near field magnetic coupling antennas are fed by a first coaxial cable with a first feeding direction, the feed point and the ground point of another one of the two near field magnetic coupling antennas are fed by a second coaxial cable with a second feeding direction, the first feeding direction and the second feeding direction are parallel to the periodically arranged conductive units, and the first feeding direction and the second feeding direction are opposite directions; wherein an angle formed by a line segment connecting the two near field magnetic coupling antennas and the periodically arranged conductive units is between 30 degrees and 50 degrees. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A near field antenna utilized for an object detecting device, for sensing a plurality of units under test of at least an object under test, the object under test having a plurality of surfaces, each surface of the object under test disposed with at least one unit under test, the near field antenna comprising:
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a periodic guided-wave structure, disposed below the object under test, having a plurality of conductive units periodically arranged on a first plane; a metallic reflection portion, disposed under the periodic guided-wave structure, the metallic reflection portion and the periodic guided-wave structure forming an enclosed space; and a plurality of near field magnetic coupling antennas, disposed on a second plane parallel to the periodic guided-wave structure, located in the enclosed space formed by the metallic reflection portion and the periodic guided-wave structure, each near field magnetic coupling antenna comprising; a plurality of annularly arranged radiators, with a first gap formed between any two adjacent radiators; and an annular conductive portion, having a plurality of annular conductive segments, each annular conductive segment partially overlapping two adjacent radiators, with a second gap formed between the two adjacent annular conductive segments and the annular conductive portion surrounding the radiators; wherein the two adjacent radiators are associated with a feed point and a ground point, and the feed point and the ground point are defined in the neighborhood of the first gap between the two adjacent radiators; wherein the feed point and the ground point of each near field magnetic coupling antenna are fed by a coaxial cable with a feeding direction, the feeding direction is parallel to the periodically arranged conductive units. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification