Displacement type tunable frequency selective fabric and its electromagnetic response mechanism

The development of tunable frequency selective surfaces that can respond to changing electromagnetic environments is a crucial area for the development of intelligent EM devices. In this research paper, a new displacement-type tunable frequency selective fabric (dTFSF) that can adjust its resonant frequency by external force is presented. The dTFSF is constructed by two identical plane frequency selective fabrics that contain periodic arranged cross-shaped conductive units. The resonance frequency of the dTFSF can be changed by displacing the two fabrics relative to each other, causing a change in the shape and size of the conductive units. The displacement is quantitatively related to the resonance frequency, allowing for precise control of the resonance frequency. Particle swarm optimization (PSO) and equivalent circuit analysis were used to obtain the equivalent EM parameters of the dTFSF. Overall, the dTFSF with lightweight and flexible nature making it an ideal candidate for integration into communication devices.