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Table 2 Parameters for path loss models for homogeneous and heterogeneous tissues and phantoms ( d 0 =250 mm)

From: Characterization of path loss and absorption for a wireless radio frequency link between an in-body endoscopy capsule and a receiver outside the body

Tissue type Configuration PL0 (dB) n value σ value R2 value
Heterogeneous Thelonius (child) 49.77 7.91 1.97 0.75
  Duke (adult) 56.83 7.10 2.99 0.70
  All data 52.04 9.08 3.97 0.64
Homogeneous Muscle, aligned antennas 57.69 3.17 0.18 0.99
  Skin, aligned antennas 56.81 3.00 0.16 0.99
  Esophagus, aligned antennas 61.33 3.05 0.15 0.99
  Esophagus, misaligned antennas 69.22 6.93 1.24 0.98