Log-periodic dipole antenna and antenna array

The invention discloses a log-periodic dipole antenna which comprises a radiator and multiple dipoles, wherein the radiator comprises an assembly line which comprises a first metal strip and a second metal strip; the multiple dipoles are parallel to one another, the lengths of the dipoles are gradually increased in the direction of the assembly line, each dipole comprises a first arm and a second arm which are arranged on the two sides of the assembly line, the first arm is connected with the first metal strip on the assembly line, the second arm is connected with the second metal strip on the assembly line, and the extension directions of the first arm and the second arm are parallel and opposite. On the other hand, the invention further provides a log-periodic dipole antenna array, the array can be formed through proper intervals in the direction of an assembly line and in the direction perpendicular to the assembly line, a scale factor tau and an interval factor sigma are adjusted, and while the minimum-si