Complex Permittivity Measurements of Textiles and Leather in a Free Space: An Angular-Invariant Approach

Table 5

Real part of the permittivity evaluated for the leather’s samples: 𝜃₁=0 and different incidence angles 𝜃₂.

Incidence angle, 𝜃2 degrees	Sample no. 0	Sample no. 1	Sample no. 2	Sample no. 3	Sample no. 4	Sample no. 5
5	2.91	3.3	2.95	2.18	2.7	2.48
10	3.31	2.97	3.03	2.03	2.71	2.75
15	3.39	3.17	3.03	2.05	2.73	2.66
20	3.42	2.99	3.08	2.16	2.96	2.51
25	3.45	3.02	3.04	2.11	3.03	2.33
30	3.44	3.03	3.05	2.26	3.09	2.45
35	3.46	3.06	3.05	2.28	3.19	2.45
40	3.5	3.12	3.03	2.28	3.23	2.43
45	3.58	3.17	2.9	2.26	3.25	2.43
50	3.54	3.21	2.92	2.13	3.28	2.45
Averaged, 𝜀^𝑟	3.4	3.104	3.008	2.17	3.02	2.49
Standard deviation	0.178	0.102	0.058	0.094	0.220	0.1221