An antenna adapted for an electronic device is provided. The antenna includes a chamber, a first liquid conductor, a second liquid conductor, and a feeding portion. The first liquid conductor is located in the chamber. The second liquid conductor is located in the chamber. A specific gravity of the second liquid conductor is larger than a specific gravity of the first liquid conductor, and a conductivity of the second liquid conductor is smaller than a conductivity of the first liquid conductor. The feeding portion extends into the chamber from an outside of the chamber. The feeding portion contacts with one of the first liquid conductor and the second liquid conductor.