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Quasi-conformal mapping of the 2D flattened lens and the fabricated lens. (a) The dielectric constant distribution of the transformed lens after the QCM transformation. (b) Discretization of the dielectric constant profile. (c) The photograph of the fabricated framework of the transformed lens, in which h = 100 mm, d = 142 mm, and t = 16 mm. The wall thickness of the framework is 0.4 mm. (d) The internal structure of the framework of the lens.
Simulated near-field distribution of the transformed lens. (a)–(c) The scattering patterns at 15 GHz when the feed is placed at x = 0 cm, −2 cm and −5 cm, respectively. (d)–(f) The scattering patterns of the lens at 12.4 GHz, 15 GHz, and 18 GHz when the feed is placed at x = −2 cm.
Relations between the dielectric constant of the liquid mixture and the composition of the acetonitrile at different frequencies, and the dielectric loss tangent of mixtures between 12 GHz and 18 GHz (inset).
Photograph of the measurement system. The mats are made of absorbent materials to prevent the external EM interference.
Experimental results of the far-field scattering EM field magnitude as a function of azimuth angle and frequency when the feed is located at (a) x = 0 cm, (b) x = −2 cm, (c) x = −3 cm, and (d) x = −5 cm.
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