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3D PRINTED ARTIFICIAL MATERIALS FOR MICROWAVE STRUCTURES
Kaděra, Petr ; Soh, Ping Jack (oponent) ; Polívka, Milan (oponent) ; Láčík, Jaroslav (vedoucí práce)
The dissertation thesis deals with the research of 3D printed artificial electromagnetic structures exploitable for antenna and microwave component design. Artificial structures containing dielectric and metallic inclusions of various geometries are investigated, and their precise description, including the anisotropy effect, can improve the actual design speed and accuracy. First, the models based on the analytical parallel plate capacitor method are compared with an effective medium theory, numerical, and experimental results, which are provided for various parameters of materials available in 3D printing technology. The proposed models derived by the parallel plate capacitor method can generally be exploited for faster and highly accurate determination of the effective complex permittivity, which enhances its potential to be used with optimization techniques. Second, the hybrid multimodal transfer matrix method is exploited as a general and effective way for calculations of the effective permittivity and effective permeability of artificial structures containing both dielectric and metallic inclusions through the volumetric space of the structures studied. The artificial structures containing metallic inclusions generally allow to achieve a wide tuning range of the effective constitutive parameters. Finally, suitable structures with spatial permittivity distribution are developed for wide-angle millimeter-wave gradient-index Luneburg lenses employable as antennas or retroreflectors for wide angular coverage and stable radar cross section enhancements of passive, chipless frequency-coded radiofrequency identification tag landmarks which have a large potential for indoor self-localization.
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