Patent ID: 8749390

Claim:
RFID/NFC antenna circuit comprising: an antenna (L) formed by a number of at least three 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 (C 1 , ZZ) for tuning at a prescribed tuning frequency, having a first capacitance terminal (C 1 X) and a second capacitance terminal (C 1 E), an intermediate tap (A) connected to the antenna (L) and distinct from the end terminals, first connection means (CON 1 A) connecting the intermediate tap (A) to a first ( 1 ) of the two access terminals, second connection means (CON 2 E) connecting the second end terminal (E) to the second capacitance terminal (C 1 E), characterized in that it comprises: third connection means (CON 31 , CON 32 ) connecting the first capacitance terminal (C 1 X) and the second ( 2 ) of the access terminals respectively to a first point (P 1 ) of the antenna (L) and to a second point (P 2 ) of the antenna (L), wherein the second point (P 2 ) is connected to the second terminal (E) of the antenna by at least one turn (S) of the antenna (L) and is connected to the first point of the antenna (L) by at least one turn (S) of the antenna (L).