Ultrawideband Lu chaotic surface-based microwave absorber design for stealth applications

Abstract

We present a novel ultrawideband microwave absorber designed using Lu chaotic system parameters and the Julia fractal set scaling function. A code developed based on the Lu chaotic system parameters was utilized to generate 3D visuals through numerical computation software. These visuals were converted to grayscale and processed with a Gaussian filter to obtain the final pattern. The resulting pattern was then transferred to an FIT-based electromagnetic simulation program, where simulation studies were conducted. The chaotic patterned resonator was placed on a Magtrex 555 material substrate, known for its frequency-dependent permittivity and permeability properties. A series of numerical studies on absorption performance such as various substrate materials (FR4 and RO4003), attractor variations, dimension, and substrate thickness are investigated. The dimension of the unit cell is monitored at 35 mm × 35 mm for the best absorption rate. It is observed that the operating frequency of the microwave absorber is between 2.5 and 18 GHz, considering the frequency range where the reflection coefficient is less than − 10 dB (magnitude less than 0.3). It can be expressed that the proposed structure demonstrates ultrawideband performance over this frequency range, covering multiple microwave bands (L-, S-, C-, X-, and Ku-band). We believe this innovative study provides valuable insights into advancing stealth technology by introducing dynamic and unique resonator architectures instead of conventional designs.