Electronic device including flexible printed circuit board

An electronic device, comprising:

• a housing;
• a first printed circuit board disposed in an internal space of the housing and comprising a plurality of first conductive terminals;
• a second printed circuit board spaced apart from the first printed circuit board;
• and
• a flexible circuit board comprising a connection portion configured to electrically connect the first printed circuit board and the second printed circuit board, and comprising a plurality of second conductive terminals,
• wherein the connecting portion comprises at least one transmissive area formed to check at least some of the plurality of first conductive terminals and at least some of the plurality of second conductive terminals from the outside, when at least some of the plurality of first conductive terminals and at least some of the plurality of second conductive terminals overlap each other to be electrically connected.

An electronic device, comprising:

• a first circuit board in which at least one antenna is disposed;
• a second circuit board in which communication circuits configured to process signals to be transmitted to or received from an external electronic device through the at least one antenna are disposed;
• and
• a flexible circuit board connected between the first circuit board and the second circuit board, wherein the flexible circuit board comprises:
• a third conductive layer comprising a first ground plane electrically connected to a ground of the communication circuit;
• a first conductive layer comprising a second ground plane electrically connected to the ground;
• a second conductive layer disposed between the third conductive layer and the first conductive layer and comprising a signal wiring electrically connected between the at least one antenna and the communication circuit;
• and
• a connection portion in which at least a portion of the signal wiring is formed with a plurality of conductive terminals electrically connected to the first circuit board through a conductive adhesive member,
• wherein the third conductive layer comprises a shielding area facing the connection portion and extended from the first ground plane and a transmissive area in which light may be transmitted.