Example of signal body diffraction. The transmitting antenna (Tx) is placed on the belt toward the right side of the body and the receiving antenna (Rx) mounted on the left wrist. Parameters Σ1, Σ2, and Σ3 are surfaces of the aperture. Parameter O is the intersection point of the Tx-Rx straight line with the body part. Parameters x1 and x2 are the start and end of Σ2 along the x-axis, respectively.