Abstract:In research on plasma stealth, and several specific plasma electron density distributions are widely discussed. For arbitrary plasma density distributions, on the other hand, there are fewer existing studies and lack of a framework. Therefore, to address this problem, this work proposes a method to reverse design the plasma parameter distributions according to the frequency band absorption requirements, using Chebyshev polynomials to approximate the plasma frequency spatial distributions. Using several numerical methods, the optimal polynomial coefficients under the required conditions are calculated to maximize the absorption rate for a given absorbing band. The reflection coefficients of the plasma absorbing structure are simulated by the hierarchical recursive method. The optimization at different thicknesses respectively gives the design scheme with the highest absorption efficiency in the 5~15 GHz, with reflections lower than -11.0 dB in the band at a thickness of 5 cm, and lower than -21.36 dB at a thickness of 10 cm. The results show that the method has a clearer purpose than the traditional method, allowing for the reverse design of the absorption in the specified band.