Kirigami-Inspired Linearly Polarized Reconfigurable 3-D Frequency-Selective Surface With Controllable Resonant Behavior

A linearly polarized reconfigurable 3-D frequency-selective surface (FSS) with controllable resonant behavior is proposed in this article. The reconfigurable performance relies on a kirigami-inspired deployable structure composed of crisscross substrates with mutually inverted notches. Four identical asymmetric double-split ring resonators are, respectively, positioned on the four faces of the 3-D unit cell with a parallelogram cross section. Under the normal incidence, two resonant frequencies can be seen in the transmission coefficient. At each resonant frequency, there exist two different reconfiguration mechanisms that have inverse impacts on the shift direction of the resonant frequency in the process of deploying. The type and the dominance degree of the reconfiguration mechanism that has the dominant impact can be adjusted by changing the position of the splits, which implies controllability of the shift speed and direction of the resonant frequencies when the deploying angle changes. Finally, a reconfigurable FSS with stable center frequency is proposed through the two resonant frequencies being engineered to shift at a similar speed but in opposite directions with the deploying angle. The simulation results illustrate that the proposed FSS can achieve a continuously reconfigurable bandwidth in the range of 4.8% and 30.3% and a center frequency variation of less than 2.0%, while the same level of center frequency stability is also verified by measurement results.