Textile structured metacomposites with tailorable negative permittivity under X and Ku band

Abstract

The metacomposites with tailorable negative permittivity including periodic interweaving ferromagnetic mircowires were fabricated by weaving and resin transfer molding methods. By manipulating the alignment direction, periodic curved length, spacing between ferromagnetic microwires for adjusting complex permittivity and permeability, the electromagnetic wave propagation of as-prepared metacomposites under X and Ku bands were evaluated and investigated by experiment and simulation. For metacomposites composed of vertically arranged microwires, for both 1 mm and 0.5 mm spacing, the permittivity turned to negative in certain frequency bands. The simultaneous existence of short periodic curved length and spacing benefits the broadening of frequency band under which metacomposites exhibits single-negative behavior. Significant transmission windows are observed due to negative permittivity occurring at plasma frequency. The simulation results show major loss for the textile structured metacomposites under X and Ku bands derives from electric loss, and small periodic curved length tends to form uniform power loss distribution. Keywords: Fabrics/textiles, Magnetic properties, Computational modelling, Weaving