A collimator is an electromagnetic device that focuses or aligns the direction of wave propagation to achieve a narrow, intense beam. In this study, we propose a two-dimensional dielectric collimator for microwave beam focusing. This is something that is difficult to achieve using theoretical- or intuition-based approaches. We therefore used a systematic design process, which is referred to as the phase field design method, to obtain an optimal topological configuration for the collimator. The phase field parameter determines the optimal configuration of the dielectric material and, as a consequence, it determines the relative permittivity of the component. To verify the design results, we fabricated a prototype via three-dimensional printing and performed an experimental verification using an electric field scanner to measure the near field distributions of the designed collimator positioned parallel to an incident wave. We also performed angle dependent experiments for which the collimator position was offset at various angles. We confirmed that the experimental results are consistent with the simulation results.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea Government (NRF-2011-0017512 and NRF-2016R1A2B4008501), and by the Agency for Defense Development of Korea (UD160026GD).
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)