This article investigates the Ricker pulse to address the issue of low radiation efficiency in time-domain antennas. Firstly, it highlights the high center frequency of the Ricker pulse, which is advantageous for improving antenna radiation efficiency. Then it proceeds to explain the power synthesis method for generating Ricker pulses, derives a theoretical formula for the optimal delay of synthesizing high-order Gaussian pulses, starting with precise time delay control. It describes the design of a unipolar pulse and the optimization of its falling edge using the sharpening capacitor method. With this unipolar pulse as a foundation, a Ricker pulse is designed, featuring a peak-to-peak value of 5.1 kV, a main peak half-width of 350 ps, and a center frequency of 0.5 GHz. To verify the correctness of the analysis, the article proposes a simple method to calculate the radiation efficiency of all-metal time-domain antennas. Both the designed Ricker pulse and a unipolar pulse with the same pulse width are used to excite the same antenna. The results demonstrate that the amplitude radiation efficiency of the single-pole pulse is only about 60%. In contrast, the Ricker pulse achieves over 80% efficiency. Similarly, the power radiation efficiency of the single-pole pulse is less than 40%, while that of the Ricker pulse can exceed 60%. The utilization of Ricker pulses as excitation has proven to be highly effective in enhancing the radiation efficiency of antennas, thereby minimizing the potential damage to transmission systems caused by reflected power. Additionally, this technique holds immense value in antenna miniaturization and exhibits promising applications in time-domain technologies like ground penetrating radar and high-power microwave sources.