Abstract
An electrically tunable metasurface is designed for radar cross-section (RCS) reduction application in this paper. It consists of 24 × 24 cells individually loaded with variable capacitors so that their phase profiles can be independently controlled by the bias voltage. Therefore, based on the diffusive scattering principle and reflect-array theory, we arrange the adaptive phase differences between adjacent basic elements and reconfigure the appropriate phase distribution determined by a genetic algorithm (GA) corresponding to the operation frequency. Thus, stable monostatic and bistatic RCS reduction with normal incidence can be realized over a wide band by independently tuning the capacitance of each loaded varactor. Simulation results verify that the bistatic RCS reduction can reach at least 10 dBSm within both 4.2-7.3 GHz and 9.3-11.3 GHz. Simultaneously, the monostatic RCS reduction reaches at least 17.5 dBSm and 14 dBSm within the above two bands, respectively.
Highlights
A metamaterial, a type of artificial material whose permeability and permittivity can be randomly tailored [1], [2], generally consists of periodically arranged subwavelength elements
DESIGN AND ANALYSIS OF THE METASURFACE By obtaining the phase variation characteristic curves versus capacitance shown in Fig 9, the number of cells and corresponding phase gradient between adjacent cells for each frequency can be determined in accordance with the different phase ranges
The simulation results of the metasurface designed in this paper show that, due to the flexible electrical phase tunability, a large monostatic radar cross-section (RCS) reduction and a robust low bistatic RCS in the case of normal incidence can be achieved over two bands (4.2 GHz-7.3 GHz and 9.3 GHz-11.3 GHz)
Summary
A metamaterial, a type of artificial material whose permeability and permittivity can be randomly tailored [1], [2], generally consists of periodically arranged subwavelength elements. Most previous works have focused on broadening the bandwidth of 10 dBSm monostatic RCS reduction, in which case the scattering power can be reduced by 90% These studies ignore that the level of RCS reduction impacts the maximum radar detection range. It is worth noting that if the maximum detection range needs to be reduced to more than half of the original, the radar cross section should be reduced by at least 14 dBSm. The metasurface proposed in this paper consists of unit cells whose phase profile versus frequency can be tuned by controlling the bias voltage of the varactors. The metasurface proposed in this paper consists of unit cells whose phase profile versus frequency can be tuned by controlling the bias voltage of the varactors In contrast to those only depending on geometrical parameters, the optimal phase distributions for each frequency component can be achieved by dynamically tuning the loaded varactors in our design. A comparison with the results in [20], [29], [30] and some other simulation results prove that the special characteristics mentioned above can be realized
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