Contactless data transmission device, security and/or valuable document including the same and method for manufacturing the contactless data transmission device

Contactless data transmission device (50) which comprises:

• an electrically insulating carrier (1),
• a circuit element arranged on the carrier (1), which circuit element comprises a continuous antenna conductor track (2) in the form of at least one spiral winding (4, 5, 6) and respectively one terminal contact (15, 16) at the ends thereof, and
• an electronic component (3) electrically connected with the circuit element with at least two contact points (11, 12), wherein the electronic component (3) is placed in a mounting region (10) above the at least one spiral winding (4, 5, 6) and wherein the at least two contact points (11, 12) of the electronic component (3) are electrically connected with a respective terminal contact (15, 16) of the antenna conductor track (2),
• wherein at least one spiral winding (4, 5, 6) is branched outside the mounting region (10) between two respective branching points (7′, 7″;
• 8′, 8″;
• 9′, 9″) into at least two spiral winding branches (4′, 4″;
• 5′, 5″;
• 6′, 6″),
• characterized in that the circuit element furthermore comprises a capacitive circuit element and that the capacitive circuit element is formed by at least one blind conductor track (25, 26) which is respectively electrically connected with a terminal contact (15, 16) of the antenna conductor track (2).