Slotted Fibonacci Spiral Metasurfaces for Microwaves Polarization Control

This paper presents a metasurface comprised by slotted Fibonacci spiral-like unit-cells built on a copper laminate over a substrate, capable to control the reflection and transmission of linearly polarized (LP) microwaves. The spiral pattern is generated by seven iterations, where the ratio between external and internal slot boundaries obeys the golden ratio, which creates the slot enlargement. Numerical simulations demonstrate multi-band resonances in different microwave frequencies for LP incident x- and y-polarization wavefronts. Excellent LP waves splitting are evidenced by high cross-talk peaks of 27dB, making this design promising for future polarization division multiplexing applications.