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In this paper, we aim to assess the performance of a transplanted organ monitoring system by considering the effect of respiration-induced organ movements and locations of the on-body antenna. A heterogeneous human model was used in our numerical investigations. The performance of an implanted antenna and its in-body channels around the liver area are studied using ultra wideband (UWB) technology. S-parameter results for various separating distances between the implanted antenna and the on-body antenna were acquired and investigated. The results demonstrate the influence of organ movement as well as the surrounding tissues on the level of signal attenuation. Our analysis indicates that UWB channel has the potential to be successfully utilized for the transplanted organ monitoring in this in-body scenario.