Antenna and electronic device including the same

An electronic device comprising:

• a housing;
• a wireless communication transceiver provided within the housing;
• an antenna radiator provided within the housing;
• a variable passive element provided in the housing;
• and
• a conductive cover of a metallic material arranged to cover at least a portion of the antenna radiator and form at least a portion of the housing, wherein the cover includes a conductive material physically connected by a conductive path to the antenna radiator, and the conductive cover is at least partially detachable from the housing,
• wherein the antenna radiator includes a plurality of contacts disposed at predetermined intervals and physically contacting the conductive cover, and wherein at least one of the plurality of contacts is electrically connected with the conductive cover,
• wherein the conductive cover and the antenna radiator have a resonant frequency, and wherein the variable passive element is configured to cause the antenna radiator to have the resonant frequency when the conductive cover is disconnected or completely removed.