Antenna and RFID device
First Claim
Patent Images
1. An antenna comprising:
- a booster antenna including a first booster coil and a second booster coil; and
a feed coil coupled to the booster antenna;
whereinthe first booster coil and the second booster coil are connected in series;
the first booster coil and the second booster coil are adjacent to each other;
the feed coil overlaps with a portion of the first booster coil and with a portion of the second booster coil at a position at which the first booster coil and the second booster coil are adjacent to each other; and
a winding direction of the second booster coil with respect to the first booster coil is a direction in which the feed coil is coupled to the first booster coil and the second booster coil in a same phase through an electromagnetic field.
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Accused Products
Abstract
In an antenna for an RFID device, a feed coil is coupled to a first booster coil and a second booster coil through an electromagnetic field. In the feed coil, a first region and a second region are disposed so as to overlap with the first booster coil and the second booster coil, respectively. The first region of the feed coil is coupled to the first booster coil through an electromagnetic field, and the second region of the feed coil is coupled to the second booster coil through an electromagnetic field. Accordingly, the antenna has a high degree of coupling between the feed coil and a booster antenna and superior transmission efficiency of an RF signal, and prevents the occurrence of a null point.
152 Citations
7 Claims
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1. An antenna comprising:
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a booster antenna including a first booster coil and a second booster coil; and a feed coil coupled to the booster antenna;
whereinthe first booster coil and the second booster coil are connected in series; the first booster coil and the second booster coil are adjacent to each other; the feed coil overlaps with a portion of the first booster coil and with a portion of the second booster coil at a position at which the first booster coil and the second booster coil are adjacent to each other; and a winding direction of the second booster coil with respect to the first booster coil is a direction in which the feed coil is coupled to the first booster coil and the second booster coil in a same phase through an electromagnetic field. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification