The use of RADAR is an important part of 6G mobile networks. However, its usage in indoor environments is not as well studied as it is for outdoors. Despite the considerable amount of information found in the literature related to RADAR signals, most of this information is only valid for outdoor environments. Conversely, such information might not be always applied for the indoor context, since the RADAR operates most of the time in its near-field region. This paper presents a study of the indoor near-field impact in the RADAR signals for 6G mobile networks integration. A circular and a square plate is used to approximate the behavior of a possible target for that purpose. Moreover, a simulation with different plate sizes and wave frequencies will be presented. The simulation results demonstrate that in the near-field region, the received power decreases with frequency, does not increase with the target area, presents strong nulls, and has an upper and lower bound.