Multi-frequency ultra-wideband oscillator and antenna

The invention provides a multi-frequency ultra-wideband oscillator and an antenna. The multi-frequency ultra-wideband oscillator comprises a low-frequency oscillator, a reflecting plate, a first high-frequency oscillator and two coupling feed sheets. The low-frequency oscillator comprises a plurality of radiation arms, a plurality of support arms and a base, the tops of the support arms are connected with the radiation arms, and the bottoms of the support arms are connected with the base. The radiation arms, the support arms and the base form a mounting cavity together. Each radiation arm is provided with vertically downward bending parts on the two sides respectively. The reflecting plate is fixed on the base. The first high-frequency oscillator is nested in the mounting cavity of the low-frequency oscillator, and the first high-frequency oscillator is fixed on the reflecting plate. The two coupling feed sheets are orthogonally connected and are arranged between the reflecting plate and the base. Therefore,