Design of Microwave Collimators for Beam Splitting and Focusing Using Dual Dielectrics

This letter proposes collimator designs composed of dual dielectric materials for microwave beam splitting and focusing using the phase-field design method. Polypropylene (PP) and paraffin were selected as dielectric materials considering the mechanical durability and manufacturing feasibility for an experimental verification. We fabricated designed collimators using a three-dimensional printing device and performed experimental verifications using a two-dimensional electric field scanner. It is confirmed that measurement results fairly agree with simulation results. Improvement of mechanical durability obtained from dual dielectric structures is also verified through numerical analysis.