Design of Three-Dimensional Frequency Selective Structure With Replaceable Unit Structures Using a 3-D Printing Technique

In this study, we designed a three-dimensional (3-D) frequency selective surface (FSS) that can be assembled with replaceable unit cells using a 3-D printing technique. The designed 3-D FSS structure consists of an array of cross-dipole structures with a conductive pattern on a square pyramid, and it exhibits frequency blocking at an operating frequency of 6.45 GHz. To verify the performance of the proposed 3-D FSS, a square pyramid-shaped dielectric substrate is manufactured using a 3-D printing technique, and a conductive pattern is implemented using a 3-D printed dispenser method. From the simulated and measurement results, the proposed structure has stable characteristics up to an incident angle of 45 degrees in the polarized TE and TM modes. Using the proposed 3-D FSS structure, unit structures are manufactured in various patterns; thus, they can be assembled easily. Furthermore, by exploiting these characteristics, the reconfiguration characteristics can be realized through structural modifications.