Figure 4
From: Feasibility of backscatter RFID systems on the human body
Snapshot of different body postures. Snapshots of body postures performed during the on-body channel measurements: The channel transfer functions, S21 and S12, of all four on-body RFID systems were measured versus 18 different stationary and moving body postures in an indoor multipath environment. The snapshots were taken during several measurement runs of the stomach-head and stomach-back links.