RFID ANTENNA CIRCUIT
First Claim
1. RFID/NFC antenna circuit comprising:
- a magnetic antenna (L) formed by a number of at least the turns (S), the antenna having a first end terminal (D) and a second end terminal (E),at least two access terminals (1, 2) to connect a charge,at least one tuning capacitance (C1, ZZ) for tuning at a prescribed tuning frequency, having a first capacitance terminal (C1X) and a second capacitance terminal (C1E),an intermediate to (A) connected to the antenna (L) and distinct from the end terminals,first connection means (CON1A) connecting the intermediate tap (A) to a first (1) of the two access terminals,second connection means (CON2E) connecting the second end terminal (E) to the second capacitance terminal (C1E),characterized in that it comprises;
third connection means (CON31, CON32) connecting the first capacitance terminal (C1X) and the second (2) of the access terminals respectively to a first point (P1) of the antenna (L) and to a second point (P2) of the antenna (L), which is connected to the first point of the antenna (L) by at least one turn (S) of the antenna (L).
1 Assignment
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Accused Products
Abstract
The invention concerns an RFID/NFC antenna circuit comprising an antenna (L) formed by at least three turns (S), the antenna having a first end terminal (D) and a second end terminal (E), two access terminals (1, 2) to connect a charge, a tuning capacitance (C1, ZZ) for tuning at a prescribed tuning frequency, an intermediate tap (A) connected to the antenna (L) and distinct from terminals (D, E), connection means (CON1A) connecting the intermediate tap (A) to terminal (1), connection means (CON2E) connecting end terminal (E) to the capacitance terminal (C1E). According to the invention, third connection means (CON31, CON32) are provided connecting the capacitance terminal (C1X) and the second access terminal (2) respectively to a first point (P1) of the antenna (L) and to a second point (P2) of the antenna (L) connected to the first point of the antenna (L) by at least one turn (S) of the antenna (L).
36 Citations
52 Claims
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1. RFID/NFC antenna circuit comprising:
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a magnetic antenna (L) formed by a number of at least the turns (S), the antenna having a first end terminal (D) and a second end terminal (E), at least two access terminals (1, 2) to connect a charge, at least one tuning capacitance (C1, ZZ) for tuning at a prescribed tuning frequency, having a first capacitance terminal (C1X) and a second capacitance terminal (C1E), an intermediate to (A) connected to the antenna (L) and distinct from the end terminals, first connection means (CON1A) connecting the intermediate tap (A) to a first (1) of the two access terminals, second connection means (CON2E) connecting the second end terminal (E) to the second capacitance terminal (C1E), characterized in that it comprises; third connection means (CON31, CON32) connecting the first capacitance terminal (C1X) and the second (2) of the access terminals respectively to a first point (P1) of the antenna (L) and to a second point (P2) of the antenna (L), which is connected to the first point of the antenna (L) by at least one turn (S) of the antenna (L). - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 27, 28, 29, 37, 38, 39, 40, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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2-14. -14. (canceled)
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22. (canceled)
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36. (canceled)
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41-42. -42. (canceled)
Specification