Inversion calculation of electromagnetic parameters of dielectric graphene in the P-band
Graphene is widely used in the field of dielectric absorbing materials due to its advantages such as low density,light weight,and rich loss mechanisms.The design and application of absorbing materials must be based on their electromagnetic parameters in the operating frequency band.In this work,the exhaustive method was employed to calculate the input impedance,dielectric constant,and dispersion relationship required for high-performance absorption of graphene materials with different thicknesses in P-band.The results show that higher real and lower imaginary values of dielectric constant are necessary for better absorption of electromagnetic waves in P-band,especially for low dielectric loss performance.In the frequency range of 0.5-1 GHz,the difference between the imaginary and real parts of the dielectric constant is reduced,the feasible range of dielectric constant for achieving high-performance absorption can be extended to 2-4,and the effective bandwidth of reflectivity can reach 0.52 GHz.By adjusting the thickness and dielectric constant reasonably,high-performance absorption can be achieved.While within the frequency range of 0.3-1 GHz,the real part of the dielectric constant is 20 times that of the imaginary part,and the reflectivity curve shows a sharp absorption peak with an absorption bandwidth of only 0.1 GHz.The requirements for the imaginary and real parts are different and demanding,which is the difficulty of regulating the dielectric constant in this frequency range.Hence introducing magnetic materials becomes essential to enhance impedance matching capability along with electromagnetic loss ability.
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