3-D Printed Terahertz Lens with Circularly Polarized Focused Near Field

A novel 3-dimensional (3-D) printed near-field-focused (NFF) lens antenna operating at 300GHz is introduced in this paper. A linearly polarized (LP) feed horn is used to feed the lens. The designed lens can transform the LP incident waves into transmitted circularly polarized (CP) waves and concentrate them into a small spot simultaneously. Moreover, 3-D printing technique is used to simplify the manufacturing process at low cost. Measured results are provided to demonstrate the feasibility of the near-field CP focusing capability of the designed 3-D printed terahertz lens.