An Optimal Method for Calculation of Absorbing Impedance of Electromagnetic Absorbing Material with Metal Backing

Abstract

The invention discloses an optimization method for calculating wave absorbing impedance of metal backing electromagnetic wave absorbing materials. The method comprises the following steps: A, acquiring the complex permeability and the complex dielectric constant of the wave absorbing materials, B, calculating a first level matching thickness, a third level matching thickness and a fifth level matching thickness of the wave absorbing materials under each electromagnetic wave frequency respectively according to a matching thickness formula, C, calculating corresponding input impedance of each electromagnetic wave frequency under the mentioned matching thickness according to an input impedance calculation formula, D, calculating absorption characteristics according to a reflection loss strength calculation formula and / or the calculation result of the step B or the calculation result of the step C, and further preparing the wave absorbing materials. According to the optimization method for calculating the wave absorbing impedance of the metal backing electromagnetic wave absorbing materials, a matching thickness model and a transmission line theory are combined and adopted, the optimization of the impedance matching of the electromagnetic wave absorbing materials is made to be more effective, the preparation of the wave absorbing materials can be completed fast and accurately, and the method is suitable for various electromagnetic wave absorbing composite materials. The optimization method for calculating the wave absorbing impedance of the metal backing electromagnetic wave absorbing materials can be widely applied to the technical field of wave absorbing materials.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave-absorbing materials, in particular to an optimization method for calculating the wave-absorbing impedance of metal-backed electromagnetic wave-absorbing materials. Background technique [0002] Explanation of terms: [0003] ①Metal backing radar wave absorbing material: such as figure 1 As shown, the electromagnetic properties of the absorbing material are characterized by the magnetic permeability μ′, μ″ (μ′ is the real part, μ″ is the imaginary part), and the dielectric constant ε′, ε″ (ε′ is the real part, ε ″ is the imaginary part) characterization; the bottom layer is a metal backing, and the material thickness is t. [0004] ② Absorbing characteristics: such as figure 2 As shown, the important parameters included in the absorbing characteristic curve are: [0005] 1) Peak frequency f 0 , unit gigahertz (GHz); 2) reflection loss RL, that is, the ratio of reflected power to ...

AI Technical Summary

Problems solved by technology

Its main disadvantages are: (1) The frequency and thickness of the perfect matching point cannot be directly found, and its frequency, bandwidth, and strength can be designed; (2) The matching thickness at the specified frequency cannot be directly determined for the selected material, and only repeated Adjust the parameters, gradually approaching

Only one thickness can be given in each calculation process. In the case of insufficient calculation, it is easy to miss the complete matching thickness. In the experiment, one layer is sprayed and measured once. If the spray is too thick, it can only be polished

This method is inefficient. If you want to obtain the exact matching frequency of the coating material, you can only do repeated cross experiments, and the cycle will be very long, which will seriously affect the production efficiency of the absorbing coating or patch.

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