A Reverse Calculation Method of Permittivity of Wave-transparent Materials Based on Improved Particle Swarm Algorithm

Abstract

The invention discloses a method for reversing the dielectric constant of a wave-transparent material based on an improved particle swarm algorithm, which belongs to the microwave field and includes the following steps: measuring and obtaining the actual value of the S21 parameter of the wave-transmitting rate of the wave-transmitting material by using a free space method; The real and imaginary parts of the relative permittivity of the wave-transmitting material are used as the optimization target, and the difference between the theoretically calculated value and the measured value of the wave-transmitting rate is used as the fitness function. The real part and imaginary part of the relative permittivity are optimized to obtain the real part and imaginary part of the relative permittivity of the wave-transparent material as the frequency changes; this method is based on the Euclidean relationship between the initial position of each particle and the initial optimal particle position distance, a new speed update formula is constructed, which has the advantages of fast convergence speed, high optimization precision, and many optimization targets. This method fully considers the characteristics of the relative permittivity of the material with the change of frequency, and has the advantages of simple calculation and high solution accuracy. High, strong noise immunity in the solution process and so on.

Description

technical field [0001] The invention belongs to the field of microwaves, and provides a reverse calculation method for the dielectric constant of a wave-transparent material based on an improved particle swarm algorithm. Background technique [0002] As an electromagnetic window, wave-transparent materials have been widely used in important fields such as microwave communication, cellular mobile communication, missile guidance, electronic countermeasures, satellite communication, satellite positioning and navigation, Bluetooth technology, remote control and telemetry. [0003] The relative permittivity of wave-transparent materials is an important basis for judging the electromagnetic properties of materials, and its accuracy is related to the development and production of materials, and is crucial to engineering applications. For example, in the simulation calculation of the absorption performance of radio frequency absorbing materials and the research process of interferen...

AI Technical Summary

Problems solved by technology

In the 1970s, Nicolson, Ross and Weir et al proposed the NRW method, which is one of the most commonly used relative permittivity inversion methods at present. Multivalued and thickness resonance problems are encountered when determining the relative permittivity of material samples

However, in this method, the problem of instability and phase ambiguity of the reverse result has not been solved

CN110162886A discloses a relative permittivity inversion method based on quantum particle swarm algorithm, but this method can not reflect the situation of relative permittivity changing with frequency, and the difference between theoretical value and measured value is large

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