Printed circuit board

A printed circuit board, comprising:

• a first insulating layer on which a coaxial transmission wiring line for transmitting a high frequency signal is disposed;
• a second insulating layer covering an upper portion of the coaxial transmission wiring line;
• a first conductive shield wall spaced apart from two opposing sides of the coaxial transmission wiring line in a width direction of the coaxial transmission wiring line, and extending in a length direction of the coaxial transmission wiring line;
• and
• a second conductive shield wall spaced apart two opposing ends of the first conductive shield wall in the length direction, and extending in the width direction;
• wherein at least one of the first conductive shield wall or the second conductive shield wall comprises a plurality of via walls each extending in a thickness direction of the first insulating layer and the second insulating layer and having a gap between the plurality of via walls.

A printed circuit board, comprising:

• a first insulating layer on which a wiring line is disposed;
• a second insulating layer covering an upper portion of the wiring line;
• and
• a conductive shield wall disposed around the wiring line and spaced apart from the wiring line,
• wherein the conductive shield wall comprises a plurality of via walls each having a hexahedral shape, and
• a portion of at least one of the first insulating layer or the second insulating layer is disposed in a gap between an adjacent pair of the plurality of via walls.