Table 4.

SCRAB-II materials under test. Extracted mean permittivity (f = 8–13 GHz) for OECP, free-space and split cavity resonator.

Material	OECP-${ϵ}_r^{\prime }$	OECP-${ϵ}_r^{″}$	Free-Space-${ϵ}_r^{\prime }$	Free-Space-${ϵ}_r^{″}$	Cavity-${ϵ}_r^{\prime }$	Cavity-${ϵ}_r^{″}$
SCRAB 4	2.34	4.7$\times {10}^{-2}$	1.66	5.7$\times {10}^{-5}$	1.77	1.3$\times {10}^{-2}$
SCRAB 9	3.01	5.7$\times {10}^{-2}$	2.15	9.6$\times {10}^{-4}$	1.99	2.0$\times {10}^{-2}$
SCRAB 10	2.51	10.6$\times {10}^{-2}$	2.18	7.1$\times {10}^{-4}$	1.70	2.0$\times {10}^{-2}$
SCRAB 13	2.18	7.6$\times {10}^{-2}$	1.33	2.5$\times {10}^{-12}$	1.53	1.3$\times {10}^{-2}$