Small-sized three-dimensional antenna

The invention discloses a small-sized three-dimensional antenna, in particular relating to a single frequency antenna which has the characteristics of small size, low height and three-dimensional structure. According to the embodiment, the antenna structurally comprises a radiating body with an extending structure; the radiating body also comprises a first radiating plane and a second radiating plane which are not in the same plane mutually, wherein the first radiating plane extends until one end of the first radiating plane is folded into a radiating body folding part, and a feed end and a grounded end form a radiating body extending structure; and the first and second planes, the radiating folding part, the feed end and the grounded end are not in the same plane. Based on the three-dimensional structure, the structure with low height can be generated and can be strengthened, and the antenna can easily achieve proper frequency band to be applied through regulating various parts.