US Patent 10292273 Flexible printed circuit board, antenna, and wireless charging device

A flexible printed circuit board according to an embodiment of the present invention includes at least one insulating layer having flexibility and containing a synthetic resin as a main component; and at least one conducting layer including a circuit pattern, wherein the circuit pattern includes a continuous spiral pattern, and the flexible printed circuit board includes a curved portion that curves such that one side and another side of the spiral pattern are disposed close to each other.