Design, Construct and Test of Ultra-Wide Band Triple-layer Meta-material Absorber

Abstract: In this paper, the design, simulation, fabrication and measurement of an ultra-wideband (UWB) meta-material absorber (MMA) is presented. The proposed MMA is planned to place between transmitter antenna and receiver antenna in a radar detection system in order to reduce the crosstalk. Expected absorption of MMA should be over 90% and covers the frequency band from 1GHz to 4GHz, especially in the frequency bandwidth 2 to 3 GHz which contains most valuable information in the applicate radar detection system.   Since referenced MMAs are resonant absorbers which have typically narrow functional ranges and operate only on single frequency, one has to adjust MMA unit cell’s physical parameters to vary its functional frequency bandwidth. But the variation of bandwidth has also its limitation due to the relative frequency theory. Therefore, a triple-layer arrangement design of MMA unit cells is used in this report, in order to generate more variations of physical parameters and gain the flexibility.   Using triple-layer arrangement design on referenced L-shape MMA unit cell, the proposed MMA is simulated using High-Frequency Structural Structure (HFSS), and the fabricated MMA board is measured by vector network analyzer (VNA). In result, simulated absorption bandwidth of the proposed structure is 1.85GHz from 2.25GHz to 4.1GHz, while testing experimental results has 1.5GHz bandwidth from 2.25GHz to 3.75GHz with more than 90% absorptivity.