Table 1.

Dielectric properties of commonly used materials to realize microfluidic channels in sensing devices.

Ref. #	Material	Permittivity εr	Loss Tangent tanδ	Frequency [GHz]
[9]	PMMA (Poly methyl methacrylate)	3.2	0.02	3–4
[30]	PFA (perfluoralkoxy)	2.1	N/S	3
[30]	Quartz	3.8	N/S	3
[52]	PDMS	2.5–2.7	0.01–0.04	2–3
[53]	PTFE—Teflon (polytetra-fluoroethylene)	2.2	0.0002	N/S
[54]	Glass *	5.27	0.003	0–10

* (Corning EAGLE XG, Taiwan); N/S represents not-stated.