Patent ID: 8035993

Claim:
A circuit board, comprising: a first patterned metal layer, comprising: a plurality of metal blocks, wherein a gap is kept between any two adjacent ones of the metal blocks; and a plurality of spiral structures, each of the spiral structures being electrically connected between two adjacent ones of the metal blocks; and a second patterned metal layer, disposed at a side of the first patterned metal layer, the second patterned metal layer comprising a plurality of jumper segments, each of the jumper segments having a first end and a second end opposite to the first end, wherein each of the spiral structures has an outer end and an inner end, the outer end is connected to one of the two adjacent ones of the metal blocks, the inner end is electrically connected to the first end of one of the jumper segments, and the second end of the one of the jumper segments is electrically connected to the other one of the two adjacent ones of the metal blocks.