Abstract
In this paper, we present a design of the linear polarization conversion metasurface (MS) for the broadband radar cross section (RCS) reduction based on split-ring resonator (SRR) structure in microwave region. The corresponding phase gradient can be obtained through the stable phase difference of basic units of polarization conversion MS. The designed polarization conversion MS is applied in coded electromagnetic (EM) matrix by defining two basic units “0” and “1”, respectively. Based on the principle of planar array theory, a new random coding method named by matrix-type coding is proposed. Correlative RCS reduction mechanism is discussed and verified, which can be used to explore the RCS reduction characteristic. The simulated linear polarization conversion rate of the designed structure is up to 90% in the frequency range of 6–15 GHz, and the RCS reduction results verify the theoretical assumptions. Two kinds of matrix-type coding MS samples are prepared and measured. The experimental results indicate that the reflectance of MS is less than –10 dB on average under normal incidence in frequency range of 5.8–15.5 GHz. The average RCS reduction is essentially more than 10 dB in frequency range of 5.5–15 GHz and the corresponding relative bandwidth is 92.7%, which reasonably agrees with simulation. In addition, excellent RCS reduction characteristic of the designed MS can also be achieved over a wide incident angle.
Highlights
As a two-dimensional artificial material, metasurface (MS) is composed of sub-wavelength element array [1,2,3,4], which has been widely applied in optoelectronics devices [5,6,7,8,9,10], such as sensor, detector, etc
Excellent radar cross section (RCS) reduction characteristic of the designed MS can be achieved over a wide incident angle
According to “energy conservation law”, an effective RCS reduction under normal incidence can be achieved by enhancing the EM energy scattering at other direction
Summary
As a two-dimensional artificial material, metasurface (MS) is composed of sub-wavelength element array [1,2,3,4], which has been widely applied in optoelectronics devices [5,6,7,8,9,10], such as sensor, detector, etc. Compared with previous works [21,22,23,24,33,34,35,36,37,38,39,40,41,42], our design has some advantages: Firstly, new random coding method with novel mechanism; Secondly, the structure of basic unit is simple, which can achieve the characteristics of 180◦ cross-polarization phase differences by rotating the metal cut-wire structure; Thirdly, our design presents the RCS reduction at lower frequency with high relative bandwidth compared with the works published before Such a simple and effective design may provide some potential applications in the field of stealth
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