Terahertz (THz) frequencies span over a range of 0.1-10 THz within the electromagnetic spectrum and seeking technologically and commercial development for various applications, particularly in wireless domain. This research paper proposes a variety of designs for the inter-digitated photoconductive antenna (IPCA) and examines their performance for efficient generation and detection of THz radiation. The design parameters like inter-digitated element dimensions, number of digitated elements and dielectric gap have been varied and a comparison of the gain bandwidth is presented using finite difference time domain solver.