A communication device, comprising: a ground plane, comprising a first edge and a second edge that are adjacent to each other; and an antenna element, comprising: a feeding portion, close to the first edge of the ground plane; a first radiation portion, forming a first resonant path with the feeding portion and comprising a first portion and a second portion that are electrically connected, wherein the first portion faces the first edge and the second portion, and the second portion extends from the second edge; a second radiation portion, forming a second resonant path with the feeding portion, wherein the antenna element is configured to operate in a first band and a second band through the first resonant path and the second resonant path; and an adjusting portion, electrically connected between the first portion and the second portion, and the adjusting portion and part of the first radiation portion form a current-dividing path configured to adjust an impedance of the antenna element in the second band, wherein the first portion is divided into a first segment and a second segment based on a place where the adjusting portion is disposed, the first segment is electrically connected to the feeding portion, the second segment is electrically connected to the second portion, and the length of the first segment is twice the length of the second segment. a ground plane, comprising a first edge and a second edge that are adjacent to each other; and an antenna element, comprising: a feeding portion, close to the first edge of the ground plane; a first radiation portion, forming a first resonant path with the feeding portion and comprising a first portion and a second portion that are electrically connected, wherein the first portion faces the first edge and the second portion, and the second portion extends from the second edge; a second radiation portion, forming a second resonant path with the feeding portion, wherein the antenna element is configured to operate in a first band and a second band through the first resonant path and the second resonant path; and an adjusting portion, electrically connected between the first portion and the second portion, and the adjusting portion and part of the first radiation portion form a current-dividing path configured to adjust an impedance of the antenna element in the second band, wherein the first portion is divided into a first segment and a second segment based on a place where the adjusting portion is disposed, the first segment is electrically connected to the feeding portion, the second segment is electrically connected to the second portion, and the length of the first segment is twice the length of the second segment. a feeding portion, close to the first edge of the ground plane; a first radiation portion, forming a first resonant path with the feeding portion and comprising a first portion and a second portion that are electrically connected, wherein the first portion faces the first edge and the second portion, and the second portion extends from the second edge; a second radiation portion, forming a second resonant path with the feeding portion, wherein the antenna element is configured to operate in a first band and a second band through the first resonant path and the second resonant path; and an adjusting portion, electrically connected between the first portion and the second portion, and the adjusting portion and part of the first radiation portion form a current-dividing path configured to adjust an impedance of the antenna element in the second band, wherein the first portion is divided into a first segment and a second segment based on a place where the adjusting portion is disposed, the first segment is electrically connected to the feeding portion, the second segment is electrically connected to the second portion, and the length of the first segment is twice the length of the second segment.