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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

Reflection phase difference between the square patch and square ring elements for different incident angles.(a) TE polarization. (b) TM polarization.
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f3: Reflection phase difference between the square patch and square ring elements for different incident angles.(a) TE polarization. (b) TM polarization.

Mentions: Figure 2 shows the two different elements of the phase gradient metasurface. One element is a metallic square patch (with dimensions of l × l) etched on one side of Rogers 5880 substrate (ε = 2.2) with a thickness of 0.127 mm. On the other side of the substrate is a foam spacer (εr = 1.1 and h = 6.5 mm) backed by a metallic ground plane. The other element is a metallic square ring, as seen in Fig. 2(b). The width of the metallic square ring is assumed to be w. In order to simplify optimization of the structure parameters, both two types of elements have the same period of p. Numerical simulation is carried out to investigate their reflection performance by using commercial software CST Microwave Studio 2014. To obtain the S-parameters of each element, the infinite periodic array model is adopted. Through parameter sweep, reflection phase difference of these two elements is optimized between 143° and 217° in X and Ku bands. Figure 2(c) depicts the reflection phases of these two elements and the phase difference between them. It is seen that reflection phase difference value is close to 180° (± 37°) in a wide frequency band ranging from 9.3 to 18.3 GHz. The reflection magnitudes are plotted in Fig. 2(d), and it shows that these two elements can achieve almost full-reflection and their reflection losses are both less than 0.05 dB. To investigate the frequency response of reflection phase for the designed two elements under the oblique incidence, we analyze the reflection phase difference between them for the different incident angles of the TE and TM incident wave, as shown in Fig. 3. It is seen that the bandwidth in which the reflection phase difference is between 143° and 217° is obviously decreased with the increase of the oblique incident angle. When the incident angle varies from 0° to 45°, the starting frequency for the phase difference of 143° is shifted towards a higher frequency, and between 17 GHz and 19 GHz, the phase difference variation is very strong. As a whole, both two elements can still achieve the required reflection phase difference at a broad band for the ± 45° oblique incidence at two polarization modes.


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)

Reflection phase difference between the square patch and square ring elements for different incident angles.(a) TE polarization. (b) TM polarization.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: Reflection phase difference between the square patch and square ring elements for different incident angles.(a) TE polarization. (b) TM polarization.
Mentions: Figure 2 shows the two different elements of the phase gradient metasurface. One element is a metallic square patch (with dimensions of l × l) etched on one side of Rogers 5880 substrate (ε = 2.2) with a thickness of 0.127 mm. On the other side of the substrate is a foam spacer (εr = 1.1 and h = 6.5 mm) backed by a metallic ground plane. The other element is a metallic square ring, as seen in Fig. 2(b). The width of the metallic square ring is assumed to be w. In order to simplify optimization of the structure parameters, both two types of elements have the same period of p. Numerical simulation is carried out to investigate their reflection performance by using commercial software CST Microwave Studio 2014. To obtain the S-parameters of each element, the infinite periodic array model is adopted. Through parameter sweep, reflection phase difference of these two elements is optimized between 143° and 217° in X and Ku bands. Figure 2(c) depicts the reflection phases of these two elements and the phase difference between them. It is seen that reflection phase difference value is close to 180° (± 37°) in a wide frequency band ranging from 9.3 to 18.3 GHz. The reflection magnitudes are plotted in Fig. 2(d), and it shows that these two elements can achieve almost full-reflection and their reflection losses are both less than 0.05 dB. To investigate the frequency response of reflection phase for the designed two elements under the oblique incidence, we analyze the reflection phase difference between them for the different incident angles of the TE and TM incident wave, as shown in Fig. 3. It is seen that the bandwidth in which the reflection phase difference is between 143° and 217° is obviously decreased with the increase of the oblique incident angle. When the incident angle varies from 0° to 45°, the starting frequency for the phase difference of 143° is shifted towards a higher frequency, and between 17 GHz and 19 GHz, the phase difference variation is very strong. As a whole, both two elements can still achieve the required reflection phase difference at a broad band for the ± 45° oblique incidence at two polarization modes.

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