Abstract
In this paper, an ultra-wideband flexible absorber is proposed. Based on a summary of the absorption mechanism, using lossless air to replace the heavy lossy dielectric layer will not substantially impact the absorption. The dielectric layer is only a thin layer of polyimide. The proposed absorber is a sandwich structure. The surface is a layer of copper metal ring and wire, and it is loaded with chip resistors to expand the absorber bandwidth. Simulated results show that the bandwidth of the proposed absorber, with an absorptivity of more than 90%, is 2.55–10.07 GHz, with a relative bandwidth over 119.2%. When the electromagnetic wave has a wide incident angle, the absorber still maintains a high absorption. This absorber has been fabricated by FPC (flexible printed circuit) technology. The proposed absorber was attached to the cylinder and measured. The measurement results are roughly the same as the simulation results. The fabricated absorber is easy to carry and flexible, such that it can easily be conformed to irregular objects. The proposed absorber is polarization-insensitive, low profile, thin, and portable, so it is easier to apply in a variety of practical fields.
Highlights
Landy first proposed perfect absorbers in 2008 [1]
This can be achieved because the designed absorber has multiple resonant structures on a single-layer medium loaded with resistance simultaneously
The simulated result shows that the absorber has a relative bandwidth of 119%, and the absorber frequency band includes the S, C, and X bands
Summary
Landy first proposed perfect absorbers in 2008 [1]. They are different from the Salisbury screen [2]and the Jaumann absorber [3], which require a very thick dielectric layer. Landy first proposed perfect absorbers in 2008 [1]. They are different from the Salisbury screen [2]. The Jaumann absorber [3], which require a very thick dielectric layer. Unit cells and dielectric materials can be designed so that incidentally nearly 100% of electromagnetic waves can be absorbed. The metamaterial absorber has a compact structure, a light weight, and an excellent absorption performance, so it has been applied in various fields, such as satellite stealth, RCS (radar cross section) reduction [4,5,6], EMC (electromagnetic compatibility), and EMI (electromagnetic interference) [7]. Broadband capabilities and flexibility make an absorber more practical. How to design an ultra-wideband, flexible, metamaterial absorber has become the focus of further practical applications
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