Circuit board for power supply, electronic apparatus including the same, and inductor device

A power supply apparatus comprising:

• a coil;
• and
• a circuit board capable of coupling the coil comprising:
• a first pattern comprising a first terminal coupled to the coil, the first pattern arranged on a first layer of the circuit board;
• a first layer region arranged on the first layer, the coil being disposed on the first layer region by coupling to the first terminal;
• and
• a second pattern comprising a second terminal electrically isolated from the coupled coil, the second pattern arranged on a second layer of the circuit board below the first layer;
• and
• a second layer region arranged on the second layer, the second layer region having no conductive material directly below the coupled coil,
• wherein a size of the second layer region matches a size of the first layer region.