In this article, the experimental verification of a 3D-printed radial GRIN lens operating in the Ku-band between 12 to 18 GHz is presented. The GRIN lens can be found useful in high directivity and beamforming antenna applications. The design of the radial GRIN lens is based on a new closed form expression for the refractive index which is derived by geometrical optics. The GO-based formula is proved to achieve a minimum phase error that can lead to an increased lens aperture efficiency. The challenges that arise from the practical realization using 3D printing technology are discussed. Measurement results of the 3D printed lens are presented and compared with simulations, showing good agreement. Two antenna types of low-medium gain are used as a lens feeder, an 5 dB open-ended waveguide antenna and a 15 dB horn antenna. A maximum gain of 25 dB is achieved with a GRIN lens aperture size of 7.2λ diameter at the highest frequency.
Paraskevopoulos, A., Gashi, I., Albani, M., Maci, S. (2022). High aperture efficiency 3D-printed radial GRIN lens. In 2022 16th European Conference on Antennas and Propagation (EuCAP) (pp.1-5). New York : IEEE [10.23919/EuCAP53622.2022.9769646].
High aperture efficiency 3D-printed radial GRIN lens
Gashi, Ilir;Albani, Matteo;Maci, Stefano
2022-01-01
Abstract
In this article, the experimental verification of a 3D-printed radial GRIN lens operating in the Ku-band between 12 to 18 GHz is presented. The GRIN lens can be found useful in high directivity and beamforming antenna applications. The design of the radial GRIN lens is based on a new closed form expression for the refractive index which is derived by geometrical optics. The GO-based formula is proved to achieve a minimum phase error that can lead to an increased lens aperture efficiency. The challenges that arise from the practical realization using 3D printing technology are discussed. Measurement results of the 3D printed lens are presented and compared with simulations, showing good agreement. Two antenna types of low-medium gain are used as a lens feeder, an 5 dB open-ended waveguide antenna and a 15 dB horn antenna. A maximum gain of 25 dB is achieved with a GRIN lens aperture size of 7.2λ diameter at the highest frequency.
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https://hdl.handle.net/11365/1321834