In this paper, we propose the optimal jammer trajectories for maintaining a constant J/S ratio. To maintain a constant J/S ratio over time, the jammer constantly transmits the interference signals toward a fixed sidelobe angle of the ground station antenna. The potential trajectories are derived to maintain a constant sidelobe angle from the straight line connecting the ground station and the satellite. Among these trajectories, we choose the trajectory that maximizes the horizontal distance between the jammer and the ground station to minimize the detection probability. We conduct J/S ratio analysis for different trajectories generated by different ψ values. The STK simulations indicate that the J/S ratio varied by up to 5.4 dB on trajectory 1, 6.9 dB on trajectory 2, and 7.9 dB on trajectory 3. These results demonstrate that relatively consistent J/S ratios are maintained throughout the operation and are in good agreement with the MATLAB results, with a maximum error of less than 4.6 dB.