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Combining the absorptive and radiative loss in metasurfaces for multi-spectral shaping of the electromagnetic scattering.

Pan W, Huang C, Pu M, Ma X, Cui J, Zhao B, Luo X - Sci Rep (2016)

Bottom Line: The absorptive and radiative losses are two fundamental aspects of the electromagnetic responses, which are widely occurring in many different systems such as waveguides, solar cells, and antennas.The anti-phase gradient and absorptive metasurfaces were designed that consists of metallic square patch and square loop structure inserted with resistors, acting as an phase gradient material in the X and Ku band, while behaving as an absorber in the S band.The simulation and experiment results verified the double-band, wideband and polarization-independent RCS reduction by the absorptive and anti-phase gradient metasurfaces.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Science, P. O. Box 350, Chengdu 610209, China.

ABSTRACT
The absorptive and radiative losses are two fundamental aspects of the electromagnetic responses, which are widely occurring in many different systems such as waveguides, solar cells, and antennas. Here we proposed a metasurface to realize the control of the absorptive and radiative loss and to reduce the radar cross section (RCS) in multi-frequency bands. The anti-phase gradient and absorptive metasurfaces were designed that consists of metallic square patch and square loop structure inserted with resistors, acting as an phase gradient material in the X and Ku band, while behaving as an absorber in the S band. The simulation and experiment results verified the double-band, wideband and polarization-independent RCS reduction by the absorptive and anti-phase gradient metasurfaces.

No MeSH data available.


Related in: MedlinePlus

Simulated RCS reduction of the designed metasurface versus frequency from 2 GHz to 19 GHz.(a) The RCS reduction of the metasurface with and without resistors for normal incidence. (b) The RCS reduction for various incident angles with TE polarization. (c) The RCS reduction for various incident angles with TM polarization.
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f7: Simulated RCS reduction of the designed metasurface versus frequency from 2 GHz to 19 GHz.(a) The RCS reduction of the metasurface with and without resistors for normal incidence. (b) The RCS reduction for various incident angles with TE polarization. (c) The RCS reduction for various incident angles with TM polarization.

Mentions: To further illustrate the absorption performance of the metasurface, the 3-D RCS of the flat PEC surface and the designed metasurface at 3.3 GHz are respectively, presented in Fig. 6(a,b). The metasurface consisting of 7 × 7 super unit cells is designed and its overall dimension is 348.6 mm × 348.6 mm. Compared with the strong backscatter energy of the flat PEC surface, the RCS of the metasurface is significantly reduced, and the peak of RCS reduction exceeds 20 dB. Fig. 6(c,d) show the scattering field distribution at 11.5 GHz. The RCS is dramatically reduced by about 19 dB along the principal planes (XZ, YZ) and the main power is scattered into four directions which are phi = 45°, 135°, 225° and 315°. Comparing Fig. 6(b–d), the employment of two different physical mechanisms produces the different scattering field distribution. In the lower frequency, most of the incoming wave is absorbed, resulting in the obvious reduction of the backscatter energy in a broad anglewidth, while in the higher frequency, the metasurface has no absorptive property and just changes the backscatter energy direction, making the normal reflection of the incident wave sharply suppressed. The RCS reduction of the metasurface with and without resistors for the normal incidence is shown in Fig. 7(a). The metasurface without resistors shows excellent RCS reduction in 10.7–18.1 GHz, while the employed resistors in the metasurface can further make the RCS sharply reduced in 2.8–3.65 GHz. And it is still found that the RCS reduction curves of these two cases almost overlap in X and Ku band, indicating that the chip resistors have no influence on the scattering performance in the higher frequency band. Fig. 7 (b,c) show the RCS reduction characteristics for different incident angles of the TE- and TM-polarized plane waves. It is seen that the RCS reduction bandwidth is decreased as the incident angle varies from 0 to 45° due to the phase aberrations. However, the proposed metasurface still keeps low RCS property for all the cases. That means the metasurface has the large angle width to reduce RCS. If some optimization works, such as particle swarm and genetic algorithms353637, are utilized to design this metasurface, the better result could be expected.


Combining the absorptive and radiative loss in metasurfaces for multi-spectral shaping of the electromagnetic scattering.

Pan W, Huang C, Pu M, Ma X, Cui J, Zhao B, Luo X - Sci Rep (2016)

Simulated RCS reduction of the designed metasurface versus frequency from 2 GHz to 19 GHz.(a) The RCS reduction of the metasurface with and without resistors for normal incidence. (b) The RCS reduction for various incident angles with TE polarization. (c) The RCS reduction for various incident angles with TM polarization.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4759823&req=5

f7: Simulated RCS reduction of the designed metasurface versus frequency from 2 GHz to 19 GHz.(a) The RCS reduction of the metasurface with and without resistors for normal incidence. (b) The RCS reduction for various incident angles with TE polarization. (c) The RCS reduction for various incident angles with TM polarization.
Mentions: To further illustrate the absorption performance of the metasurface, the 3-D RCS of the flat PEC surface and the designed metasurface at 3.3 GHz are respectively, presented in Fig. 6(a,b). The metasurface consisting of 7 × 7 super unit cells is designed and its overall dimension is 348.6 mm × 348.6 mm. Compared with the strong backscatter energy of the flat PEC surface, the RCS of the metasurface is significantly reduced, and the peak of RCS reduction exceeds 20 dB. Fig. 6(c,d) show the scattering field distribution at 11.5 GHz. The RCS is dramatically reduced by about 19 dB along the principal planes (XZ, YZ) and the main power is scattered into four directions which are phi = 45°, 135°, 225° and 315°. Comparing Fig. 6(b–d), the employment of two different physical mechanisms produces the different scattering field distribution. In the lower frequency, most of the incoming wave is absorbed, resulting in the obvious reduction of the backscatter energy in a broad anglewidth, while in the higher frequency, the metasurface has no absorptive property and just changes the backscatter energy direction, making the normal reflection of the incident wave sharply suppressed. The RCS reduction of the metasurface with and without resistors for the normal incidence is shown in Fig. 7(a). The metasurface without resistors shows excellent RCS reduction in 10.7–18.1 GHz, while the employed resistors in the metasurface can further make the RCS sharply reduced in 2.8–3.65 GHz. And it is still found that the RCS reduction curves of these two cases almost overlap in X and Ku band, indicating that the chip resistors have no influence on the scattering performance in the higher frequency band. Fig. 7 (b,c) show the RCS reduction characteristics for different incident angles of the TE- and TM-polarized plane waves. It is seen that the RCS reduction bandwidth is decreased as the incident angle varies from 0 to 45° due to the phase aberrations. However, the proposed metasurface still keeps low RCS property for all the cases. That means the metasurface has the large angle width to reduce RCS. If some optimization works, such as particle swarm and genetic algorithms353637, are utilized to design this metasurface, the better result could be expected.

Bottom Line: The absorptive and radiative losses are two fundamental aspects of the electromagnetic responses, which are widely occurring in many different systems such as waveguides, solar cells, and antennas.The anti-phase gradient and absorptive metasurfaces were designed that consists of metallic square patch and square loop structure inserted with resistors, acting as an phase gradient material in the X and Ku band, while behaving as an absorber in the S band.The simulation and experiment results verified the double-band, wideband and polarization-independent RCS reduction by the absorptive and anti-phase gradient metasurfaces.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Science, P. O. Box 350, Chengdu 610209, China.

ABSTRACT
The absorptive and radiative losses are two fundamental aspects of the electromagnetic responses, which are widely occurring in many different systems such as waveguides, solar cells, and antennas. Here we proposed a metasurface to realize the control of the absorptive and radiative loss and to reduce the radar cross section (RCS) in multi-frequency bands. The anti-phase gradient and absorptive metasurfaces were designed that consists of metallic square patch and square loop structure inserted with resistors, acting as an phase gradient material in the X and Ku band, while behaving as an absorber in the S band. The simulation and experiment results verified the double-band, wideband and polarization-independent RCS reduction by the absorptive and anti-phase gradient metasurfaces.

No MeSH data available.


Related in: MedlinePlus