Experimental research and statistical analysis on the dielectric properties of lunar soil simulators

To support the microwave brightness data re- trieval of future China space-borne lunar exploration mi- crowave radiometer, based on the collection of plentiful ter- restrial basalts and anorthosites and their chemical composi- tions got by X-ray fluorescence, nine lunar soil simulators were prepared and made respectively into 0.8, 1.0, 1.2, 1.4 and 1.6 g/cm3 five densities each. We measured their relative dielectric constants over the range of 0.5?20 GHz with open-ended coaxial line model on the HP8722C Network Analyzer and then processed and analyzed the measurement data. This study shows that among the three parameters of density, frequency and composition, density has the strongest effect on the relative dielectric constants, frequency comes second, composition the least. The three parameters account for 45%, 33% and 22% respectively of the changed real part of a relative dielectric constant, and 55%, 27% and 19% respectively of the changed imaginary part. The real parts of the relative dielectric constants are linearly linearly corre- lated with density or frequency, and the imaginary parts have a linear relation with both approximately over the range of 0.5?10 GHz and tend to be poorly correlated with them in 10?20 GHz. The effect of composition on a relative dielectric constant seems very complicated, both probably do not follow a simple function relation, with the least correla- tion. Multiple regression analysis indicates that major ele- ment oxides SiO2, Al2O3, CaO, MgO, TiO2 and ?Fe are cor- respondent to a one-order polynomial, and TiO2 or ?Fe or TiO2+?Fe has not been proven to be the indicators in the contribution to the relative dielectric constants.

To support the microwave brightness data retrieval of future Chinaspace-borne lunar exploration microwave radiometer, based on the collection of plentiful terrestrialbasalts and anorthosites and their chemical compositions got by X-ray fluorescence, nine lunar soilsimelators were prepared and made respectively into 0.8, 1.0, 1.2, 1.4 and 1.6 g/cm^3 fivedensities each. We measured their relative dielectric constants over the range of 0.5-20 GHz withopen-ended coaxial line model on the HP8722C Network Analyzer and then processed and analyzed themeasurement data. This study shows that among the three parameters of density, frequency andcomposition, density has the strongest effect on the relative dielectric constants, frequency comessecond, composition the least. The three parameters account for 45 percent, 33 percent and 22percent respectively of the changed real part of a relative dielectric constant, and 55 percent, 27percent and 19 percent respectively of the changed imaginary part. The real parts of the relativedielectric constants are linearly linearly correlated with density or frequency, and the imaginaryparts have a linear relation with both approximately over the range of 0.5-10 GHz and tend to bepoorly correlated with them in 10-20 GHz. The effect of composition on a relative dielectricconstant seems very complicated, both probably do not follow a simple function relation, with theleast correlation. Multiple regression analysis indicates that major element oxides SiO_2, A1_2O_3,CaO, MgO, TiO_2 and AFe are correspondent to a one-order polynomial, and TiO_2 or AFe or TiO_2+AFehas not been proven to be the indicators in the contribution to the relative dielectric constants.