Booster antenna configurations and methods
A booster antenna (BA) for a smart card comprises a card antenna (CA) component extending around a periphery of a card body (CB), a coupler coil (CC) component at a location for an antenna module (AM), and an extension antenna (EA) contributing to the inductance of the booster antenna (BA). A method of wire embedding is also disclosed, by controlling a force and ultrasonic power applied by an embedding tool at different positions on the card body (CB).
1. A booster antenna (BA) comprising a card antenna (CA) component extending around a periphery of a card body (CB), a coupler coil (CC) component disposed at a coupling area of the card body (CB) corresponding to an antenna module (AM), and an extension antenna (EA) component, characterized by:
the extension antenna (EA) component has a sense opposite to that from the card antenna (CA) component.
2. The booster antenna (BA) of claim 1 , wherein the coupler coil (CC) component has a sense which is the same as the sense of the extension antenna (EA) component.
3. The booster antenna (BA) of claim 1 , wherein the card antenna (CA) component has an outer winding (OW) and an inner winding (IW).
4. A smart card (SC) incorporating the booster antenna (BA) of claim 1 .
5. Booster antenna (BA) comprising the following components:
a card antenna (CA) component;
a coupler coil (CC) component; and
an extension antenna (EA) component;
characterized in that:
at least one of the components has a sense which is opposite one or more of the other components.
6. The booster antenna (BA) of claim 5 , wherein:
at least one of the components comprises an outer winding (OW, ow) and an inner winding (IW, iw).
7. The booster antenna of claim 5 , wherein:
at least some of the components have innermost and outermost turns;
at least one of the components is laid from an innermost turn to an outermost turn; and
at least another of the components is laid from an outermost turn to an innermost turn.
8. Booster antenna (BA) comprising:
a card antenna (CA) component;
a coupler coil (CC) component;
a first capacitive stub connected with the coupler coil (CC) component; and
a second capacitive stub connected with the card antenna (CA) component.
9. The booster antenna (BA) of claim 8 , wherein:
the two capacitive stubs are each formed in a flat coil pattern having a number of turns.
10. The booster antenna (BA) of claim 8 , wherein:
the two capacitive stubs are substantially identical with one another.