Antenna and radiation unit

The invention discloses an antenna and a radiation unit. The radiation unit comprises a radiation assembly and a substrate. The radiation assembly comprises four radiation monopoles, and the four radiation monopoles are respectively arranged at intervals and form a radiation structure in a surrounding manner, wherein each radiation monopole comprises a radiation arm and a balun arm vertically fixed with the radiation arm; the radiation arms of the two oppositely arranged radiation monopoles form a dipole, and the free end of each balun arm is provided with a connecting part; the substrate is provided with a feed circuit layer, the feed circuit layer is provided with feed sources in one-to-one correspondence with the balun arms, and the feed sources and the balun arms are welded for feeding, so the radiation monopoles are fixedly arranged on the substrate. The radiation unit can adapt to change design of the radiation arm, die waste is reduced, and research and development cost is reduced. The antenna adopts t