Broadband microwave absorption based on the configuration resonance of wires
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Broadband microwave absorption based on the configuration resonance of wires Henrik Parsamyan1 · Hovhannes Haroyan1 · Khachatur Nerkararyan1 Received: 27 April 2020 / Accepted: 1 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The absorption efficiency of a conductive wire can be essentially increased in the broad microwave spectrum from 4 to 12 GHz by the appropriate choice of the radius and height of a wire. Such functional dependence ensures matching between the configuration and the incident field oriented by the wire axis even for relatively large values of the imaginary part of the dielectric constant of a wire. Theoretical results obtained within the limits of electrostatic approximation and numerical calculations reveal that the absorption cross-section of a wire can exceed the geometrical one by about 22 times, whereas the scattering efficiency is negligibly small. Such properties allow one to achieve relatively high absorption of the incident wave by a system consisting of the wires properly distributed on a flat surface. Keywords Absorber · Broadband · Electromagnetic wave absorption · Numerical simulation
1 Introduction Over the years, electromagnetic absorbers have attracted significant attention for their wide use and potential applications in electromagnetic compatibility, sensors, bolometers, solar energy harvesting, thermal emitters, and emerging passive cooling technologies [1–3]. Furthermore, various defense and aerospace applications, such as constructing “stealth” aircrafts [4, 5], camouflaging ground-based military devices and units against radar surveillance, and designing anechoic chambers necessitate the conception of efficient microwave shielding and absorbing materials, especially in the radar frequency range of 2–18 GHz. In this respect, the design of novel radar absorbing materials has recently become an issue of great importance and demanded extensive research efforts. High-performance electromagnetic wave absorbers are required for electromagnetic wave control to eliminate interference between various devices within a broad bandwidth from radio frequency to a millimeter-wave spectrum, which will play a big role in upcoming 5G wireless networks [6]. * Khachatur Nerkararyan [email protected] 1
Department of Microwave Physics and Telecommunication, Yerevan State University, 1 Alex Manoogian, Yerevan 0025, Republic of Armenia
On the other hand, with the rapid development of wireless communication technology, electronic equipment has been widely applied in various fields. However, electromagnetic pollution has grown to be a severe issue to be solved. Microwave absorbers can effectively absorb the electromagnetic waves and reduce the impact of electromagnetic pollution [7]. For common absorbent materials, the absorption principles are mainly linked to electrical loss or magnetic loss. However, these absorbers hardly achieve ultra-wideband absorption because of the impedance mismatching [8, 9]. Although various nanocomposites with both magnetic
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