Abstract
An efficient physical optics (PO) calculation method is proposed for the electromagnetic (EM) scattering of electrically large targets coated with magnetized plasma characterized by asymmetric tensor dielectric parameters. The outer surface of the arbitrarily shaped target is discretized into triangular elements. According to the principle of tangent plane approximation and by using the plane wave spectrum expansion method, the scattered field from one triangular element is derived as a double integral in the spectral domain. To obtain the solution in the spatial domain, the saddle point method is used to asymptotically calculate the integral. Then, the equivalent surface currents (ESCs) are constructed by calculating the surface field at the outer surface of the planar model, from which the PO solution is derived by using the Stratton–Chu integral. Moreover, to interpret the field propagation process in the plasma layer quantitatively, the total scattered field of the coated planar model is decomposed into the superposition of different mode field components. It is observed that the scattered fields demonstrate an inherent cross-polarization phenomenon due to the nonreciprocal constitutive relation of the plasma, which is a distinct feature and is different from the general anisotropic medium whose dielectric parameters can be diagonalized. The effectiveness of the proposed method is verified by numerical results. Furthermore, the proposed algorithm consumes less calculation time and memory as compared to commercial full solvers.
Highlights
As we all know, plasma is the fourth state of matter formed by gas ionization
Since the first discovery [1], due to the unique propagation characteristics of EM waves in plasma [2,3,4,5,6], it has attracted great attention in many fields such as target stealth technology represented by scatterer radar cross-section (RCS) control, and radiation system design represented by an antenna or a radome [7,8,9,10]
Aiming at the targets coated with magnetized plasma characterized by asymmetric tensor dielectric parameters, this paper proposes an efficient and accurate physical optics algorithm based on a spectral-domain asymptotic calculation to achieve high-frequency scattering prediction of plasma-coated electrically large targets
Summary
Plasma is the fourth state of matter formed by gas ionization. Since the first discovery [1], due to the unique propagation characteristics of EM waves in plasma [2,3,4,5,6], it has attracted great attention in many fields such as target stealth technology represented by scatterer radar cross-section (RCS) control, and radiation system design represented by an antenna or a radome [7,8,9,10]. This paper is mainly based on the expected research on the high-frequency theoretical calculation method of EM wave scattering of plasma-coated targets. The propagation of EM waves by magnetized plasma usually shows anisotropic characteristics, and its dielectric parameters should be in the form of an asymmetric tensor [28,29] to characterize its non-reciprocal constitutive relationship. Aiming at the targets coated with magnetized plasma characterized by asymmetric tensor dielectric parameters, this paper proposes an efficient and accurate physical optics algorithm based on a spectral-domain asymptotic calculation to achieve high-frequency scattering prediction of plasma-coated electrically large targets. Numerical examples are given to illustrate the effectiveness of the proposed method, and the scattering characteristics of anisotropic plasma-coated planar models and complex targets are discussed and analyzed.
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