According to various embodiments of the disclosure, an antenna device comprises: a first antenna array including an array of a plurality of first radiation patches, a communication circuit configured to transmit and/or receive a radio signal using at least one of the first radiation patches, and at least one first isolator comprising a conductor disposed in an area between two adjacent first radiation patches among the first radiation patches. The first isolator may include a first portion, a second portion disposed in parallel with the first portion, and a third portion electrically connecting the first portion with the second portion. The first portion and the second portion may be configured to generate current flows having a phase difference of 180 degrees with respect to each other.