Abstract
In this paper, a novel ultra-wide band (UWB) random 3-bit coding metasurface with polarization independence has been designed to realize radar cross-section (RCS) reduction. The proposed structure consists of polarization conversion metasurfaces (PCMs), which possess the capability of rotating linear polarization waves to their orthogonal ones in an UWB. The polarization-independent property can be attributed to the random rotation angle of each constituting unit. Due to the randomness of 3-bit coding and rotation angle of each element, the divergence of the reflected beam is greatly improved. In addition, the effect of RCS reduction with respect to the unit period length and the unit position are also discussed. Finally, a prototype is fabricated and measured to validate the simulation. The experimental results demonstrate that an ultra-wide band RCS reduction over 10 dB, ranging from 18.3–42.2 GHz, can be attained by the proposed coding metasurface and the maximum reduction is 28.7 dB.
Highlights
Metamaterials are usually composed of periodically or non-periodically arranged units.By changing the size and arrangement of the metamaterial structure, the dielectric constant and permeability can be controlled to effectively manipulate electromagnetic waves [1,2,3]
Electromagnetic cloaking is of great significance in modern warfare, which can greatly improve the survivability of weapon platforms
The design concept of this random coding metasurface is as follows: firstly, the polarization conversion metasurfaces (PCMs) unit is proposed through optimum design and simulation
Summary
Metamaterials are usually composed of periodically or non-periodically arranged units.By changing the size and arrangement of the metamaterial structure, the dielectric constant and permeability can be controlled to effectively manipulate electromagnetic waves [1,2,3]. The phase discontinuity of the incident electromagnetic wave on the interface can be generated to achieve the abnormal refraction and reflection, satisfying the request of regulating and controlling the incoming electromagnetic waves [6,7,8,9,10]. Radar cross-section (RCS) is the key concept in radar stealth technology. It represents a physical quantity of echo intensity produced by a target irradiated by radar wave. One of the important applications of metasurface is electromagnetic cloaking, which reduces the detectability of a target radar by decreasing the scattering cross-section [14]. Phase gradient metasurfaces can couple incident electromagnetic waves to surface waves or cause abnormal reflection
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