The study of complex properties in a binary mixture of polar liquids has been carried out in the frequency range of 10[Formula: see text]MHz to 30 GHz at 293[Formula: see text]K and 298[Formula: see text]K temperatures using time domain reflectometry. The complex properties of polar liquids in binary mixture give information about the frequency dispersion in the dielectric permittivity ([Formula: see text]) and dielectric loss ([Formula: see text]). The information regarding the orientation of electric dipoles in a polar liquid mixture is given by Kirkwood parameters. The Bruggeman parameters are used as the indicator of liquid1 and liquid2 interaction. Molar entropy ([Formula: see text]) and molar enthalpy ([Formula: see text]) are also discussed at the end of the paper.

The time domain reflectometry (TDR) technique has been used for the study of dielectric relaxation spectra of 1,2 dichloroethane (DE) and n,n-dimethylformamide (DMF) binary mixtures. The frequency range used for the study is 10 MHz to 30 GHz. The study is carried out at 10°C, 15°C, 20°C and 25°C temperature for 11 different concentrations. The dielectric parameters such as static permittivity (ε0), dielectric constant at high frequency (ε∞) and relaxation time (τ) have been obtained. The Excess parameters, Kirkwood parameters and thermodynamic parameters are determined.

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The complex permittivity spectra and thermodynamic properties of 1,2-dichloroethane (DE) and n,n-dimethylformamide (DMF) polar liquids has been obtained at 15°C temperature in the frequency range of 10 MHz to 30 GHz by using time domain reflectometry technique for 11 different concentrations of the system. Time dependent data is processed to obtained complex reflection coefficient spectra *(ω). Complex permittivity spectra is obtained from bilinear callibration method and this spectra gives information regarding dielectric dispersion (ɛʹ) and dielectric absorption (ɛʺ), which indicates the purity of the liquid mixture. The modified Bruggeman model is also a parameter which may be used an indicator of liquid 1 and 2 interactions. In binary mixture of polar liquids, there is a change in the energy of the system. This change in energy can be interpreted with thermodynamic parameters such as free energy of activation (G), molar enthalpy of activation (H) and molar entropy of activation (S).