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Demonstrates wide beam steering in terahertz GRIN lens, indicating improved scanning capabilities.
A terahertz gradient-index (GRIN) dual-polarized lens with wide-angle beam-steering is designed in this article. A novel GRIN distribution is designed by superimposing the refractive index of the Luneburg lens and the Gutman lens to expand the beam-steering angle. The effects of the superposition ratio of Luneburg lens and Gutman lens <tex-math notation="LaTeX">\</tex-math> on the scanning performance of GRIN lens are studied. The novel GRIN distribution is provided for two different purposes. The lens has good scanning performance with a planar feed, and dual polarization can be achieved. High-precision 3-D printing technology is utilized to fabricate the proposed lens to verify the proposed GRIN distribution. A GRIN lens with an aperture size of 8 mm × 8 mm and a thickness of 6.4 mm was manufactured. The proposed lens is measured to validate the implementation method at 220 GHz. The results show that the proposed GRIN lens has a wide beam scanning angle of ±39° and ±38° in vertical polarization and horizontal polarization, respectively. The lens has a peak gain of 19.2 dBi. The scanning losses of the lens are 0.5 dB for vertical polarization and 0.7 for horizontal polarization, respectively.
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Guo et al. (2025) studied this question.
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