2.5D Inductive Intertwined Frequency Selective Surface For Pass-Band Applications

This paper presents the design of a miniaturized intertwined pass-band inductive frequency selective surface in a 2.5D configuration. In the literature, we have identified that the 2.5D configuration has been described and used only for a capacitive intertwined frequency selective surface; therefore, we describe the design of this structure, taking Brigid's cross as an example that later on can be used as starting point for other types of structures. Moreover, the proposed structure presents high miniaturization capabilities, reaching a period of 0.00967 wavelengths and a fractional bandwidth of 30.856 % without the influence of a substrate. Finally, besides the pass-band capabilities of the structure, it also offers a wide stop-band in upper frequencies with a fractional bandwidth of 73.15 %.