Table 1 The permittivity of water in the D-band, \({\varepsilon ^{\prime} }_{{\rm{r}}}\) and \({\varepsilon ^{\prime\prime} }_{{\rm{r}}}\) are the fitting values, \(\Delta {\varepsilon ^{\prime} }_{{\rm{r}}}\) and \(\Delta {\varepsilon ^{\prime\prime} }_{{\rm{r}}}\) represent the deviation of the raw data from the fitting data.

Freq (GHz)		110	115	120	125	130	135	140	145	150	155	160	165	170
\({\varepsilon ^{\prime} }_{{\rm{r}}}\)	18 °C	9.29	9.00	8.74	8.51	8.31	8.12	7.96	7.81	7.67	7.54	7.41	7.28	7.14
	26 °C	8.72	8.46	8.22	8.00	7.79	7.60	7.42	7.26	7.12	6.99	6.88	6.78	6.70
	33 °C	7.61	7.44	7.28	7.12	6.96	6.82	6.69	6.56	6.44	6.34	6.25	6.17	6.11
\({\varepsilon ^{\prime\prime} }_{{\rm{r}}}\)	18 °C	14.86	14.27	13.74	13.25	12.83	12.43	12.05	11.72	11.40	11.12	10.85	10.58	10.33
	26 °C	13.54	12.99	12.48	12.02	11.57	11.19	10.82	10.50	10.22	9.99	9.78	9.61	9.49
	33 °C	11.9	11.45	11.04	10.65	10.3	9.95	9.64	9.37	9.09	8.85	8.63	8.42	8.22
\(\Delta {\varepsilon ^{\prime} }_{{\rm{r}}}\)	18 °C	−0.07	0.06	−0.10	−0.01	0.01	−0.01	0.00	0.03	−0.01	0.00	0.02	−0.04	0.10
	26 °C	0.32	0.02	−0.02	−0.33	−0.25	−0.17	0.09	0.14	0.13	0.11	0.04	−0.07	−0.33
	33 °C	0.13	0.00	0.01	−0.04	0.01	−0.04	0.02	0.05	−0.04	0.01	0.01	−0.06	0.04
\(\Delta {\varepsilon ^{\prime\prime} }_{{\rm{r}}}\)	18 °C	0.00	0.09	−0.03	0.12	−0.05	−0.06	0.11	0.05	0.04	0.00	0.00	−0.03	0.09
	26 °C	0.17	0.25	−0.04	−0.10	−0.06	−0.20	−0.01	0.04	0.13	0.11	0.10	−0.10	−0.35
	33 °C	0.07	0.02	0.15	−0.06	−0.05	0.10	0.05	−0.04	0.04	0.10	−0.06	−0.08	0.17

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