Patent ID: 6918535

Claim:
A safety paper with a) a structure in the form of an electronic circuit ( 1 , 4 , 7 ) making possible a contactless checking of an authenticity feature, b) the circuit ( 1 , 4 , 7 ) comprising an electronic circuit chip and a pattern ( 7 ) connected therewith and serving as a sending/receiving antenna that, c) the electronic circuit, in response to a received input signal, is operative to emit emits an output signal indicating the presence of the authenticity feature, d) the and whose pattern ( 50 , 50 ′) serving as a sending/receiving antenna has the form of being formed as a dipole antenna comprised of two conductor strips ( 50 , 50 ′) extending along a common straight line, e) which at facing ends thereof are contacted with connecting areas ( 70 , 70 ′) of the circuit chip ( 40 ), f) the conductor strips and are formed by portions of a thin insulating polymer substrate strip that have been made conductive, between whose g) the circuit chip is positioned on an insulating portion, delimited between the facing ends of the conductor strips ( 50 , 50 ′), the circuit chip ( 40 ) is positioned, wherein h) the circuit chip ( 40 ) is formed on a thin-ground semiconductor substrate which is arranged on the insulating portion of the polymer substrate strip.