Optimization of Performance Parameters of Doped Ferrite-Based Microwave Absorbers: Their Structural, Tunable Reflection Loss, Bandwidth, and Input Impedance Characteristics
Jasbir Singh, Charanjeet Singh, Dalveer Kaur, Sukhleen Bindra Narang, Rajshree B. Jotania, Amrin R. Kagdi, R. V. Joshi, A. S. B. Sombra, Di Zhou, Sergei Trukhanov, Larrisa Panina, А.В. Труханов
Abstract
In this study, M-type barium strontium hexagonal ferrite was prepared with CoSn doping. The crystallographic structure of ferrite compositions was explored using X-ray diffraction (XRD). The microwave absorption characteristics were investigated on a vector network analyzer as a function of the doping of Co <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> and Sn <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4+</sup> , frequency, and thickness of the samples. Analysis of measured XRD patterns confirmed the M-phase in the prepared samples. The electromagnetic parameters accompanied by permeability/magnetic loss, dielectric constant/loss, were increased with CoSn content. The obtained results revealed that microwave absorption was enhanced by doping with Co <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> and Sn <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4+</sup> ions. The absorption was increased from -15.2 dB in compositions x = 0.0 to -51.09 dB in x = 0.6 composition; -10 dB bandwidth = 2.43 GHz was displayed in x = 1.0 composition at 1.7 mm thickness. Both input impedance and λ/4 criterion based on thickness doping govern the mechanism of microwave absorption. x = 1.0 composition owes a large bandwidth to thickness ratio of 3.52 at the frequency of 10.88 GHz and a percentage bandwidth of 22.33 % at a thickness of 1.7 mm. The observed absorption peaks were tuned to the desired frequency by exploiting the composition thickness and input impedance through doping with Co <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> and Sn <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4+</sup> ions. The wide bandwidth with optimized absorption find applications in the field of wireless communication such as isolators, circulators, and radar application.