The exact amount of transmission and reflection is not only dependent on the dielectric properties, but also on the angle of incidence and material thickness.
In other words, part of the high frequency energy that reaches the food is absorbed by the object and converted into heat; the rest is scattered in many directions with varying intensity
Only six tags out of the 22 placed at the bottom of the pallets were read: two at the front, two at the back and two in the middle (Fig. 3b).
The four tags at the front and back of the container may have received RF signal via reflection from the walls. The two tags in the middle were most likely read because of a greater gap between the pallets.