Abstract
In this article, a multiple diffuse coding metasurface (MDCM) of independent polarization is designed to control the propagation direction of diffuse reflections under different polarizations and to improve the monostatic and bistatic RCS (radar cross section) reduction effect. First, a method for controlling the distribution range and propagation direction of the diffuse field is studied, and the diffuse field distribution of the random phase metasurface is optimized by a genetic algorithm to improve the uniformity of the diffuse scattering distribution. Then, the random phase distribution is superimposed on the periodic gradient phase distributions of the linear and hedge types in the orthogonal direction so that the main propagation direction of the diffuse metasurface deviates from the specular reflection region under different polarizations, showing single and two diffuse beams. Finally, the anisotropic unit cell with a rectangle inside and an improved Jerusalem cross on the outside is employed as the basic coding element of the MDCM due to its independent polarization phase response. The numerical and experimental results show that the MDCM features multiple diffuse scattering, independent polarization and angle insensitivity and can efficiently improve the monostatic and bistatic RCS reduction effect simultaneously. Because the scattered energies are redirected away from the specular reflection direction, the specular scattering reduction effect is better than the isotropic diffuse metasurface. The proposed method increases the difficulty of detection by single or netted radar and has the potential for the applications of stealth techniques.
Highlights
With the rapid development of radar detection technology, improving the stealth performance of aircraft in the 1-18 GHz band has become the forefront and focus of research on stealth technology [1]–[4]
The control method of the diffuse scattering field distribution range and main propagation direction is studied, and the scattering field distribution of the diffuse metasurface is optimized based on a genetic algorithm
On the premise that the total number of unit cells in the coding metasurface remains unchanged, the larger the subarray period is, the more unit cells are included in the period, and the smaller the diffuse scattering distribution range is
Summary
With the rapid development of radar detection technology, improving the stealth performance of aircraft in the 1-18 GHz band has become the forefront and focus of research on stealth technology [1]–[4]. According to the principle of energy conservation, the bistatic RCS can be effectively reduced by increasing the number of electromagnetic wave scattering beams. The diffuse metasurface utilized the random distribution of phases between the units to scatter the reflected waves into the whole space field, which significantly increased the number of scattered beams and effectively reduced the bistatic RCS. The main scattering directions of the diffuse beams are within a certain angle range along the specular reflection direction, so the monostatic RCS reduction effect is not ideal. In 2016, Liu et al [21] first proposed the addition theorem, which laid the foundation for the simultaneous monostatic and bistatic RCS reduction and the flexible control of the diffuse scattering direction. The reflected beams do not have the effect of diffuse scattering, resulting in the poor reduction of the bistatic RCS. The MDCM features an independent polarization, angle insensitivity performance and simultaneously improves the monostatic and bistatic RCS reduction effect
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
