In this paper, an 1×8 linear array of printed circuit board antennas with a Chebyshev aperture distribution is designed and simulated for fifth-generation (5G) applications. The primary goal of this design is to reduce mutual coupling between array elements using neutralization lines. The design process is carried out in two stages. In the first stage, the antenna array is designed and simulated with specifications including a central frequency of 28 GHz, a sidelobe level of -20 dB, and dimensions of 45×10.5×1.55 mm. In the second stage, after reducing the spacing between elements to half (1 mm) to compact the structure, neutralization lines are proposed to significantly reduce mutual coupling between the elements. These neutralization lines, placed between each element, substantially suppress unwanted surface currents responsible for mutual coupling. The dimensions of these lines are derived based on analytical equations. To validate the proposed design, simulations are conducted in two antenna analysis software environments, with the results confirming each other. The simulation results indicate that mutual coupling between adjacent elements is reduced to -29.76 dB. The bandwidth of the proposed structure is 3.09 GHz, ranging from 25.84 to 28.95 GHz, and the minimum mutual coupling between adjacent elements within this bandwidth is -32.84 dB. Additionally, the maximum gain of the antenna array is 8.92 dB. Finally, the efficiency of the proposed method is compared with other published research.