Abstract
Narrow absorption bandwidth has been a fundamental drawback hindering many metamaterial absorbers for practical applications. In this paper, by loading lumped resistors, we have successfully designed a microwave metamaterial absorber with multioctave wide absorption bandwidth covering the entire X- and Ku-bands, while keeping the thickness of the absorber less than 1/10 of the working wavelength. The polarization-insensitive absorber shows a good angular stability for both transverse electric (TE) and transverse magnetic (TM) incidences. Prototype has been fabricated and measured to validate the design principle and the simulated results, and good agreements are observed between simulated and measured results. The proposed metamaterial absorber offers an efficient way to realize broadband microwave absorption with stable angular performance, which may find potential uses in many applications, for example, electromagnetic compatibility.
Highlights
The electromagnetic (EM) wave absorbers, which are viewed as EM blackbodies that can efficiently inhibit reflection and transmission of EM radiation, have attracted much attention due to their practical uses in many real-world applications such as electromagnetic compatibility (EMC), stealth technique, etc. [1]
Unremitting efforts have been made to enhance the absorption performances with factors such as polarization-insensitive [4], switchable or active control [5,6], ultrathin thickness [7], and wide incident angle [8] across the whole spectrum ranging from microwave to optics
To realize efficient wave absorption, the metamaterial structures are often designed to resonate at certain frequencies, and when these structures are shined by the incidence, field enhancement occurs in structures, which leads to energy dissipations caused by the lossy components, for example, lossy dielectric substrates
Summary
The electromagnetic (EM) wave absorbers, which are viewed as EM blackbodies that can efficiently inhibit reflection and transmission of EM radiation, have attracted much attention due to their practical uses in many real-world applications such as electromagnetic compatibility (EMC), stealth technique, etc. [1]. By loading a set of metallic via holes, the magnetic resonances of the structure have been enhanced throughout the working band, resulting in a good angular stability for incident angle up to about ±60° for. Both transverse electric (TE) and transverse magnetic (TM) waves. Experiments have been carried out to validate the design principle and the simulated results, and good agreements are observed between simulated and measured results
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