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(a) 3D view of the proposed dual-band beam steering THz antenna. (b) Geometry of the broadband omnidirectional monopole source antenna. The relevant geometrical dimensions are m = 72, n = 144, g1 = 33.6, g2 = 43.2, all in μm. (c) Reflection coefficients of the broadband omnidirectional source antenna and the dual-band beam steering THz antenna under different states. (d) Radiation patterns of the omnidirectional source antenna on the horizontal plane at two frequencies.
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