An ultra-wideband (UWB) resistance-loaded Vivaldi antenna is proposed in this letter. The antenna is in the form of a dual-layer Vivaldi, sandwiching the feeding strip in the middle, thus avoiding excessive interference to the feeding strip and the H-plane pattern is more symmetrical. By adding 100-Ω resistors to Vivaldi, the impedance characteristics of the low frequency can be significantly improved. In addition, by the introduction of serrate on the Vivaldi, the current path can be changed, which improves the pattern and increases the gain. To verify the design, the antenna substrate plate was processed and measured with the size of 0.5λ L × 0.36λ L , where λ L is the wavelength of the low frequency. From the measured results, the proposed antenna achieves a wide impedance bandwidth of 8:1 from 2.0 to 16.3 GHz with a return loss more than 10 dB. Moreover, the measured gain of the antenna is 4 to 11 dBi, and the radiation pattern is very stable over the entire frequency bandwidth.