Abstract
A class of linear polarization conversion coding metasurfaces (MSs) based on a metal cut-wire structure is proposed, which can be applied to the reduction properties of radar cross section (RCS). We firstly present a hypothesis based on the principle of planar array theory, and then verify the RCS reduction characteristics using linear polarization conversion coding MSs by simulations and experiments. The simulated results show that in the frequency range of 6–14 GHz, the linear polarization conversion ratio reaches a maximum value of 90%, which is in good agreement with the theoretical predictions. For normal incident x- and y-polarized waves, RCS reduction of designed coding MSs 01/01 and 01/10 is essentially more than 10 dB in the above-mentioned frequency range. We prepare and measure the 01/10 coding MS sample, and find that the experimental results in terms of reflectance and RCS reduction are in good agreement with the simulated ones under normal incidence. In addition, under oblique incidence, RCS reduction is suppressed as the angle of incidence increases, but still exhibits RCS reduction effects in a certain frequency range. The designed MS is expected to have valuable potential in applications for stealth field technology.
Highlights
As a subwavelength artificial composite, metamaterial (MM) has some exotic electromagnetic (EM) properties that are unavailable in nature [1,2,3,4]
A basic unit based on a metal cut-wire structure was designed, which allowed us to achieve the highly efficient conversion of linear polarization within a broadband frequency range
Utilizing a super-cell consisting of 5 × 5 basic units, we studied the radar cross section (RCS) reduction of the polarization conversion MS based on super-coding theory
Summary
As a subwavelength artificial composite, metamaterial (MM) has some exotic electromagnetic (EM) properties that are unavailable in nature [1,2,3,4]. Coding MS can diffuse the energy of EM waves in each direction by optimizing the matrix arrangement This coding MS exhibits a broadband characteristic compared with traditional GMS, but still has the disadvantage of polarization-sensitivity. Based on the above research, we designed a series of coding MSs, one of which has the characteristics of a wide band range and polarization insensitivity, meaning that it promotes the RCS reduction of incident EM waves in all polarization directions. The RCS reduction mechanism of the designed MS is different from the absorber; by designing the structure graphics and coding scheme, the incident waves are reflected irregularly back into free space, which lowers the probability of the MS being detected by infrared devices. At oblique incidence, RCS reduction is suppressed, but still has a certain effect in the above-mentioned frequency range
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