An electronic device comprising: a communication module; and an antenna structure electrically connected to the communication module, wherein the antenna structure includes: a conductive substrate including a first area and a second area adjacent to the first area, a plurality of first slits formed in the first area of the conductive substrate parallel to each other with a first predetermined interval therebetween in a predetermined direction (x), and a plurality of second slits formed in the second area of the conductive substrate at a position corresponding to an inter-slit area between at least some slits among the plurality of first slits, the plurality of second slits being parallel to each other at a second predetermined interval therebetween in the predetermined direction (x), and wherein the plurality of second slits extend to a portion of the inter-slit area between the plurality of first slits, wherein the plurality of first slits form a first antenna array, wherein the plurality of second slits form a second antenna array, wherein a plurality of first conductive lines are disposed adjacent to each other on a rear face of the first area, wherein a plurality of second conductive lines are disposed adjacent to each other on the rear face of the second area, wherein each of the plurality of first conductive lines is configured to feed one of each of the plurality of first slits, and wherein each of the plurality of second conductive lines is configured to feed one of each of the plurality of second slits. a communication module; and an antenna structure electrically connected to the communication module, wherein the antenna structure includes: a conductive substrate including a first area and a second area adjacent to the first area, a plurality of first slits formed in the first area of the conductive substrate parallel to each other with a first predetermined interval therebetween in a predetermined direction (x), and a plurality of second slits formed in the second area of the conductive substrate at a position corresponding to an inter-slit area between at least some slits among the plurality of first slits, the plurality of second slits being parallel to each other at a second predetermined interval therebetween in the predetermined direction (x), and wherein the plurality of second slits extend to a portion of the inter-slit area between the plurality of first slits, wherein the plurality of first slits form a first antenna array, wherein the plurality of second slits form a second antenna array, wherein a plurality of first conductive lines are disposed adjacent to each other on a rear face of the first area, wherein a plurality of second conductive lines are disposed adjacent to each other on the rear face of the second area, wherein each of the plurality of first conductive lines is configured to feed one of each of the plurality of first slits, and wherein each of the plurality of second conductive lines is configured to feed one of each of the plurality of second slits. a conductive substrate including a first area and a second area adjacent to the first area, a plurality of first slits formed in the first area of the conductive substrate parallel to each other with a first predetermined interval therebetween in a predetermined direction (x), and a plurality of second slits formed in the second area of the conductive substrate at a position corresponding to an inter-slit area between at least some slits among the plurality of first slits, the plurality of second slits being parallel to each other at a second predetermined interval therebetween in the predetermined direction (x), and wherein the plurality of second slits extend to a portion of the inter-slit area between the plurality of first slits, wherein the plurality of first slits form a first antenna array, wherein the plurality of second slits form a second antenna array, wherein a plurality of first conductive lines are disposed adjacent to each other on a rear face of the first area, wherein a plurality of second conductive lines are disposed adjacent to each other on the rear face of the second area, wherein each of the plurality of first conductive lines is configured to feed one of each of the plurality of first slits, and wherein each of the plurality of second conductive lines is configured to feed one of each of the plurality of second slits.