Electronic device including antenna

An electronic device comprising:

• a first housing comprising a first side member and a first conductive portion disposed at the first side member;
• a second housing slidably coupled to the first housing, the second housing comprising a second side member and a second conductive portion disposed at the second side member, the second conductive portion overlapping at least a part of the first conductive portion in a slide-in state;
• a wireless communication circuit disposed in the electronic device and electrically connected to the first conductive portion;
• and
• at least one electrical connection structure disposed in a space of the second housing, the at least one electrical connection structure configured to electrically connect the second conductive portion to the first conductive portion in the slide-in state,
• wherein the wireless communication circuit is configured to transmit and/or receive a radio signal in at least one frequency band through the first conductive portion and the second conductive portion in the slide-in state,
• wherein the first conductive portion is disposed through a first non-conductive portion and a second non-conductive portion spaced apart from each other at a designated interval in the first side member,
• wherein the second conductive portion is disposed through a third non-conductive portion disposed in the second side member,
• wherein the electrical connection structure is disposed to at least partially protrude into the space in the second housing and at least partially physically comes into contact with the first conductive portion in the slide-in state,
• wherein at least some of a section corresponding to a round-trip distance and belonging to a section in which the first side member and the second side member face each other comprises an electrical disconnection section in which the electrical connection structure is electrically disconnected from the first conductive portion,
• wherein the electrical disconnection section comprises a section in which the electrical connection structure and the first conductive portion do not come into contact with each other, and
• wherein the electrical disconnection section is formed through a recess formed lower than an outer surface of the first conductive portion.