Taming the Electromagnetic Boundaries via Metasurfaces: From Theory and Fabrication to Functional Devices

Figure 43

(a) Principle of the sidelobe reduction with the metasurface superstrate. (b) The geometry of the amplitude tunable metasurface to reduce the sidelobe of the horn antenna array. (c) Schematic of the unit cell of the metasurface. (d) Comparison of the normalized transmission amplitude distribution of the proposed antenna composite and the ideal Taylor amplitude distribution. (e) Phase distributions at the reference plane. The inset figure shows the electric field distribution at -plane. (f) Radiation pattern in the -plane of the antenna composite at 10.3 GHz with sidelobe level of −25.9 dB.

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