This paper focuses on creating T-shaped planar antennas for radar applications utilizing High Frequency Structure Simulator (HFSS) software. Antenna factors such as return loss, gain, and radiation pattern are examined to find the best design for the X-Band RADAR application (8 GHz to 12 GHz). Through evaluation and comparison, it is determined that the H-shaped antenna, measuring 70 * 60 * 1.6, provides the best overall performance. This antenna has an efficient gain of 6.7 dB and an operational frequency of 9.02 GHz. The choice of the H-shaped design over other configurations indicates its superiority in addressing the requirements of RADAR systems operating within the defined frequency range. This work emphasizes the importance of simulation techniques such as HFSS in antenna design, which enables detailed analysis and optimization to obtain desired performance metrics. The discoveries contribute to upgrading antenna technology for radar applications, improving communication and sensing capabilities within the X-Band frequency range.