An electronic device comprising: a housing; a plurality of metallic parts (210a, 210b) forming a portion of the housing; a clock generator disposed in the housing; and a processor, wherein the processor is configured to sense a grip on the electronic device based on a current loop formed by a first signal generated by the clock generator and transmitted through a first metallic part and a second metallic part of the plurality of the metallic parts, wherein the second metallic part is disposed adjacent to the first metallic part with a first separator disposed between the first metallic part and the second metallic part and configured to electrically separate the first metallic part and the second metallic part, wherein at least one of the plurality of metallic parts (210a, 210b) comprises an antenna, wherein the clock generator is electrically connected to the first metallic part, wherein the electronic device further comprises a first capacitor and a first inductor disposed between the clock generator and the first metallic part, the first capacitor configured for preventing leakage while signals generated by the clock generator are transmitted to the first metallic part, wherein the clock generator is electrically connected to the second metallic part, wherein the electronic device further comprises a second capacitor and a second inductor disposed between the clock generator and the second metallic part, the second capacitor configured for preventing leakage while signals generated by the clock generator are transmitted to the second metallic part, wherein the processor is configured to determine that the current loop is formed, when a signal loss of the first signal in the current loop due to the first separator is less than a default loss. a housing; a plurality of metallic parts (210a, 210b) forming a portion of the housing; a clock generator disposed in the housing; and a processor, wherein the processor is configured to sense a grip on the electronic device based on a current loop formed by a first signal generated by the clock generator and transmitted through a first metallic part and a second metallic part of the plurality of the metallic parts, wherein the second metallic part is disposed adjacent to the first metallic part with a first separator disposed between the first metallic part and the second metallic part and configured to electrically separate the first metallic part and the second metallic part, wherein at least one of the plurality of metallic parts (210a, 210b) comprises an antenna, wherein the clock generator is electrically connected to the first metallic part, wherein the electronic device further comprises a first capacitor and a first inductor disposed between the clock generator and the first metallic part, the first capacitor configured for preventing leakage while signals generated by the clock generator are transmitted to the first metallic part, wherein the clock generator is electrically connected to the second metallic part, wherein the electronic device further comprises a second capacitor and a second inductor disposed between the clock generator and the second metallic part, the second capacitor configured for preventing leakage while signals generated by the clock generator are transmitted to the second metallic part, wherein the processor is configured to determine that the current loop is formed, when a signal loss of the first signal in the current loop due to the first separator is less than a default loss.