An electronic module includes a first sub-module and a second sub-module. The first sub-module includes a first substrate, a first electronic component disposed on the first substrate and a first electrode. The second sub-module includes a second substrate, a second electronic component disposed on the second substrate and a second electrode spaced from the first electrode. The second electrode faces the first electrode to form a capacitor for transmitting an alternating current (AC) signal between the first sub-module and the second sub-module.