RFID booster antennas, antenna modules, and increasing coupling
First Claim
Patent Images
1. A transponder comprising:
- a booster antenna comprising a first antenna structure in the form of a flat coil having a number of turns, an outer end and an inner end, and a second antenna structure in the form of a flat coil having a number of turns, an outer end and an inner end;
the inner end of the second antenna structure is connected with the outer end of the first antenna structure; and
the outer end of the second antenna structure and the inner end of the first antenna structure are left unconnected.
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Abstract
A transponder with an antenna module having a chip module and an antenna; a booster antenna having a first antenna structure in the form of a flat coil having a number of turns, an outer end and an inner end, and a second antenna structure in the form of a flat coil having a number of turns, an outer end and an inner end; the inner end of the second antenna structure connected with the outer end of the first antenna structure. The antenna module may be positioned so that its antenna overlaps one of the first antenna structure or the second antenna structure. An antenna module having two additional antenna structures is disclosed. Methods of enhancing coupling are disclosed.
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Citations
21 Claims
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1. A transponder comprising:
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a booster antenna comprising a first antenna structure in the form of a flat coil having a number of turns, an outer end and an inner end, and a second antenna structure in the form of a flat coil having a number of turns, an outer end and an inner end; the inner end of the second antenna structure is connected with the outer end of the first antenna structure; and the outer end of the second antenna structure and the inner end of the first antenna structure are left unconnected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An antenna module for a transponder comprising:
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a chip module; a first antenna structure which is an antenna having two ends connected with the chip module; at least one additional antenna structure which is a stub connected with the first antenna structure. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method of enhancing coupling a transponder to an external reader comprising:
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providing a booster antenna comprising a first antenna structure in the form of a flat coil having a number of turns, an outer end and an inner end, and a second antenna structure in the form of a flat coil having a number of turns, an outer end and an inner end; connecting the inner end of the second antenna structure with the outer end of the first antenna structure; and leaving the outer end of the second antenna structure and the inner end of the first antenna structure unconnected. - View Dependent Claims (18)
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19. Booster antenna for a secure document, comprising:
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a first antenna structure in the form of a flat coil having a number of turns, an outer end and an inner end; and a second antenna structure in the form of a flat coil having a number of turns, an outer end and an inner end; the inner end of the second antenna structure is connected with the outer end of the first antenna structure; and the outer end of the second antenna structure and the inner end of the first antenna structure are left unconnected. - View Dependent Claims (20, 21)
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Specification