Electronic device including capacitive structure

An electronic device comprising:

• a housing including a first plate, a second plate facing a direction opposite the first plate, and a side member comprising a side wall surrounding a space between the first plate and the second plate, wherein the side member includes a conductive portion;
• a conductive mid-plate disposed inside the housing parallel to the second plate, the conductive mid-plate defining an opening together with the conductive portion when viewed from above the second plate;
• a display positioned between the conductive mid-plate and the first plate, the display being viewable through at least part of the first plate;
• a dielectric material filling at least part of the opening;
• a printed circuit board (PCB) disposed inside the housing between the conductive mid-plate and the second plate, the PCB including a ground plane;
• and
• a capacitive structure comprising a conductive material disposed between the conductive mid-plate and the PCB, wherein the dielectric material is disposed between the capacitive structure and the conductive portion when viewed from above the second plate, wherein the capacitive structure includes:
• a first conductive layer connected to the conductive mid-plate;
• a second conductive layer spaced apart from the first conductive layer;
• and
• a dielectric layer interposed between the first conductive layer and the second conductive layer;
• and
• a conductive member comprising a conductive material interposed between, and in contact with, the second conductive layer and the PCB, wherein the conductive member is electrically connected to the ground plane.