To improve terahertz (THz) radiation intensity, the dipole antenna arrays with THz chokes on a thin LT-GaAs film are designed. The output radiation of the proposed linear array can be linearly enhanced by increasing the number of elements, while the average matching efficiency is changed insignificantly. The AC component flowing into the coplanar strip line (CPS) is limited by THz chokes which leads to a more stable resonant frequency, and the average matching efficiency is twice that of an array without chokes. We find the staggered array has a narrower emission spectrum than the gridding one due to the coupling of adjacent elements in the vertical direction. By designing the array on a polyimide lens instead of a silicon lens, a high input resistance can be obtained, and the total efficiency is raised from 25% to 35%.