2005-352858 is referenced by 128 patents.

PROBLEM TO BE SOLVED: To provide a communication type recording medium such as a noncontact IC card or an RFID system that increases a communication range.SOLUTION: A first wiring 110 formed on one side of a base forms: (1) a first coil pattern 111 formed at the end of the first wiring while facing a chip coil 13 across an insulator layer; (2) a third coil pattern 112 extending from the outermost periphery of the first coil pattern 111 and wound in the direction opposite to the winding direction of the first coil pattern 111; and (3) a first capacity-forming electrode pattern 113 formed at the end of the third coil pattern 112. A second wiring 120 formed on the other side of the base forms a second coil pattern 121 formed at the end of the second wiring 120 while facing the first coil pattern 111 via the base, and a second capacity-forming electrode pattern 123 formed at the end of the second wiring 120 while facing the capacity-forming electrode pattern 113 via the base.

Title
Communication type recording medium
Application Number
2004-174139
Publication Number
2005-352858
Application Date
June 11, 2004
Publication Date
December 22, 2005
Inventor
Kamisaka Koichi
Assignee
Hitachi Maxell
IPC
H01Q 07/00
G06K 19/07
B42D 15/10
G06K 19/077