Fundamentals of EM Design of Radar Absorbing Structures (RAS)

Abstract

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Design of periodic wideband pixel absorber by genetic algorithm combined with internal multi‐port method

“…After optimization, a wideband pixel absorber is obtained, as shown in Figure 5, where the metal patch is in yellow and the 100‐Ω resistance is in red. Absorptivity ( A ) is the property of a body that determines the fraction of incident radiation absorbed by the body 1‐3 . In this work, due to the metal ground of the structure, the absorptivity is expressed as: where | S 11 | 2 represents the reflected power.…”

“…The structural electromagnetic absorber can be designed by means of its equivalent circuit 1,12,13 . With the equivalent circuit model, the absorber can be analyzed and designed easily and quickly.…”

“…A classic absorber, Salisbury screen, consists of a resistive sheet placed a quarter wavelength apart from the ground plane. 1 It is a good example of the absorber with simple structure and design procedure. However, it has drawbacks of narrow bandwidth and high profile.…”

Novel synthesis formulas to design square patch frequency selective surface absorber based on equivalent circuit model

“…Full wave analysis is time consuming and sometimes is not suitable for optimization procedure when the simulation has to be run many times. An alternative procedure to deal with FSS is the transmission line method along with equivalent circuits . By using transmission line method, only the TEM mode is considered and the coupling between layers in neglected in multilayer structures.…”

Hybrid carbonaceous materials for radar absorbing poly(vinylidene fluoride) composites with multilayered structures

“…Thus, sandwich structures based on Salisbury Screen absorbers are of great interest due to their design flexibility, low reflection, lightweight, and good mechanical properties. [26][27] They consist of a dielectric spacer such as a honeycomb structure sandwiched by two absorbing single-layers: a top layer with suitable impedance matching that allows the incident EM radiation to penetrate into the system and the layer in contact with the metal which act as a reflector. The advantage of this structure is the capability of the honeycomb hexagonal cells to confine the EM wave in its interior promoting the canceling of the EM wave phase and allowing energy absorption.…”