Compact loop antenna for inductive read/write apparatus
First Claim
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1. A loop antenna, for use in an inductive read/write apparatus, comprising:
- two or more loop patterns, by maintaining a predetermined distance from one to another, each of which being formed by at least one turn of spiral, interconnecting respective start points of all the layered loop patterns and interconnecting respective end points thereof, thereby connecting all the layered loop patterns in parallel,an inter-start point connection changeover unit for connecting between respective start points of said layered loop pattern selectively, andan inter-end point connection changeover unit for connecting between respective end points of said layered loop pattern selectively.
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Abstract
In order to provide a compact loop antenna, for use in an inductive read/write apparatus, capable of extending a communication range even if the antenna area or power supply thereto is constrained, a compact loop antenna, for use in an inductive read/write apparatus, comprises two layers of loop antennas, each thereof comprising a printed circuit board 2 for featuring a loop pattern 1, a loop pattern 1 formed by an etching process on the printed circuit board 2, and a start terminal 3 and a end terminal 4 for supplying power for signal transmission and outputting a received signal and each thereof maintaining a predetermined distance from each other.
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Citations
16 Claims
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1. A loop antenna, for use in an inductive read/write apparatus, comprising:
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two or more loop patterns, by maintaining a predetermined distance from one to another, each of which being formed by at least one turn of spiral, interconnecting respective start points of all the layered loop patterns and interconnecting respective end points thereof, thereby connecting all the layered loop patterns in parallel, an inter-start point connection changeover unit for connecting between respective start points of said layered loop pattern selectively, and an inter-end point connection changeover unit for connecting between respective end points of said layered loop pattern selectively. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A loop antenna, for use in an inductive read/write apparatus, comprising:
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two or more loop patterns at a distance from one to another, each loop pattern including a start, an end, and at least one spiral turn; an inter-start point connection changeover unit to connect respective starts of the loop patterns selectively, and an inter-end point connection changeover unit to connect between respective ends of the loop pattern selectively. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A loop antenna, for use in an inductive read/write apparatus, comprising:
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two or more loop patterns at a distance from one to another, each loop pattern including a start, an end, and at least one spiral turn, wherein the respective starts of all the loop patterns are interconnected and wherein the respective ends are interconnected such that all the loop patterns are in parallel; an inter-start point connection changeover unit to connect respective starts of the loop patterns selectively; and an inter-end point connection changeover unit to connect between respective ends of the loop pattern selectively. - View Dependent Claims (16)
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Specification