Multi-band antenna of compact size

A multi-band antenna (20) of compact size includes a conductor of uniform cross-section folded to form the antenna (20) with a connection portion (CP), a low-frequency first radiation portion (L), and a high-frequency second radiation portion (H). The connection portion (CP) has a feeding point (S) for signal feeding. The first and second radiation portions (L, H) connect to two ends of the connection portion (CP) . The first radiation portion (L) is folded along two different planes (P1, P2) to form three main sections (L1, L3, L5). The second radiation portion (H) is folded along a plane to form two sections (H1, H2). A terminal section (L5) of the first radiation portion (L) and a terminal section (H2) of the second radiation portion (H) are parallel, such that radiation of these two sections is coupled to enhance radiation characteristics of the antenna (20). Also, the folded structure helps to achieve compact size of the antenna (20).