Relationship Between Leaf Volume and Leaf Attenuation in Tree Shielding from 2.4 GHz to 15 GHz

In this letter, the relationship between the amount of leaves and leaf attenuation was clarified. We conducted FDTD calculations and measurements for a tree species called Red Robin and within the frequency range of 2.4 GHz to 15 GHz. In addition, we confirmed that the amount of leaves is defined by the product of the density of leaves and the length of the propagation path within the leaf area. We also defined leaf attenuation per unit leaf volume as LAC (leaf attenuation coefficient) to use as an index to quantify the leaf attenuation and clarified its frequency characteristics.