Ultra-wideband planar log-periodic monopole antenna

The utility model discloses an ultra-wideband planar log-periodic monopole antenna belonging to the field of antennae, which comprises a metal plate, a radiant panel, a substrate, a micro-strip line and a coaxial connector. The substrate is arranged on the metal plate. The radiant panel and the micro-strip line are arranged on the substrate. The radiant panel is formed by two radiation fins. Each radiation fin is provided with a plurality of arc-shaped toothed radiation elements connected together through a rectangular radiation element. The number and the frequency point of the resonance points of the antenna can be changed through adjusting the number and the arc length of outboard arc-shaped toothed radiation elements, while the impedance characteristic of the antenna can be changed through adjusting the length of inboard arc-shaped toothed radiation elements and the angle formed between the two radiation fins. Thus, the ultra-wideband antenna is realized through the above appropriate adjustment. Meanwhile