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This letter deals with a new technique to efficiently analyze on-body radio channel problems. The bilateral dual-grid finite-difference time-domain (FDTD) method is applied to determine the transmission between two on-body devices, considering various positions of the receiving antenna on the chest of the body. This new technique aims at efficiently simulating a full-duplex link where both transmitting and receiving antennas require a precise description while their environment does not imply a particularly fine mesh. Comparisons to measurements show good agreement, and results are obtained in a considerably reduced computation time.