Abstract
In this paper, a novel method of realizing the ultra-wideband (UWB) radar cross section (RCS) reduction is proposed. We combine the chessboard structure of multi-elements which are all polarization conversion metasurface (PCM) units with random coding. Four different kinds of PCM units all with UWB and much high polarization conversion rate (PCR) are selected. Morever, their polarization conversion frequency bands are optimized not only in the high frequency segment but also in the low frequency segment. The final designed structure can achieve 10 dB RCS reduction within 6.9 GHz–20.1 GHz in the high frequency segment and 15.5 GHz–51.2 GHz in the low frequency segment, respectively. In addition, the effects of RCS reduction by the square chessboard structure composed of different numbers of these PCM units are compared. The proposed metasurface structure provides an efficient scheme to reduce the scattering of the electromagnetic waves.
Highlights
In recent years, with the rapid development of radar technology, the theoretical research and practical application of stealth technology has become a hot spot of domestic and foreign scholars
COMPARISONS OF radar cross section (RCS) REDUCTION EFFECT OF META-SURFACES CONSIST OF DIFFERENT NUMBERS OF polarization conversion metasurface (PCM) UNITS In the case of the high frequency segment, four different kinds of PCM units above are firstly constructed into 6×6 square chessboard structures respectively, and combined each of them into 4 × 4 metasurface structures, respectively
For the chessboard structure composed of PCM units, the reflection phase of each part is 180◦ different from that of the adjacent parts, and the reflection waves of each two parts cancel each other, so the RCS reduction effect is not bad [16]
Summary
With the rapid development of radar technology, the theoretical research and practical application of stealth technology has become a hot spot of domestic and foreign scholars. The essence of radar stealth is to use various means to reduce the echo signal of the target, so that the enemy radar can’t detect accurately. In this paper, a new type of PCM chessboard metasurface with random coding is constructed by the elements with broadband polar- ization conversion property, which can scatter the electromagnetic wave in all directions, and convert the incident electromagnetic wave into another kind of linearly polarized outgoing wave with cross polarization. It greatly widens the backward RCS reduction bandwidth
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