A miniaturized ultra-wideband 3 dB directional coupler working in 0.2~2.65 GHz is presented, which adopts symmetrical multi-section coupling strip line. The coupler is composed of a seventeen-section coupler and a five-section coupler in cross series. By using meander lines, it achieves a compact size with 13:1 bandwidth. The measured results show that the Voltage Standing Wave Ratio (VSWR) is less than 1.35 within the bandwidth covering 0.2~2.65 GHz, the isolation is less than -17 dB, the in-band ripple is within -3.4±0.6 dB, and 90°phase shift can be achieved.