Low-profile high-gain fractal miniature base station antenna

The invention discloses a low-profile high-gain fractal miniature base station antenna. The antenna is characterized by comprising an antenna housing, a reflecting plate combination body, a substrate, a metal separator plate array, a medium substrate with an antenna oscillator printed thereon, and a feed coaxial feed line connected with the antenna oscillator. The antenna oscillator comprises four sheet type units which are laterally and vertically symmetrical. Two units of the four sheet type units along each diagonal line form a pair of dipoles. The four sheet type units form crossed dipoles. A Minkowski fractal loop is formed by making secondary iteration I2 square Von Koch fractal curves connected in a head-to-tail way and changed into a planar sheet through filling. A pair of lug type bodies with the diagonal line as the symmetric axis is formed on the right upper corner or the left upper corner of the fractal loop. The lug type bodies are further combined with the fractal loops to form the four sheet type units. The antenna provided in the invention achieves a low profile, makes the back lobe obviously suppressed and further makes the front-to-rear ratio and the cross polarization ratio obviously improved through a proper design of the fractal miniature base station antenna structure. High gain and high efficiency which cannot be achieved through a common crossed dipole are further achieved.