US 12,439,508 B2
Circuit board
Kosuke Nishio, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Jul. 24, 2023, as Appl. No. 18/225,273.
Application 18/225,273 is a continuation of application No. PCT/JP2021/045751, filed on Dec. 13, 2021.
Claims priority of application No. 2021-020481 (JP), filed on Feb. 12, 2021.
Prior Publication US 2024/0008168 A1, Jan. 4, 2024
Int. Cl. H05K 1/02 (2006.01); H01P 3/08 (2006.01)
CPC H05K 1/0242 (2013.01) [H01P 3/081 (2013.01); H05K 1/028 (2013.01); H05K 2201/0129 (2013.01); H05K 2201/09263 (2013.01); H05K 2201/09672 (2013.01); H05K 2201/09681 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A circuit board comprising:
a body including an upper principal surface and a lower principal surface, the upper principal surface having a normal extending in an up-down direction;
a first signal conductor layer that is line-shaped and provided in the body; and
a first line-shaped reference conductor layer that is line-shaped and provided in the body at a position above the first signal conductor layer; wherein
an insulator layer is provided between the first signal conductor layer and the first line-shaped reference conductor layer in the up-down direction;
a direction in which the first signal conductor layer extends is defined as a transmission direction;
a direction orthogonal to the up-down direction and the transmission direction is defined as an orthogonal direction;
the orthogonal direction includes a first orthogonal direction and a second orthogonal direction opposite to the first orthogonal direction;
when viewed in the up-down direction, the first line-shaped reference conductor layer extends along the first signal conductor layer such that portions of the first line-shaped reference conductor layer and portions of the first signal conductor layer overlap;
when viewed in the up-down direction, the first line-shaped reference conductor layer meanders such that one or more first projecting portions projecting from the first signal conductor layer in the first orthogonal direction and one or more second projecting portions projecting from the first signal conductor layer in the second orthogonal direction are arranged in an alternating order in the transmission direction;
a pair including one of the one or more first projecting portions and one of the one or more second projecting portions that are adjacent to each other is defined as a first pair of projecting portions; and
a section of at least one or more first pairs of projecting portions excluding both ends of the at least one or more first pairs of projecting portions is not connected to a conductor layer other than one or more of the one or more first projecting portions and one or more of the one or more second projecting portions included in the at least one or more first pairs of projecting portions.