Microwave Absorption Characteristics Research Articles

Unraveling the role of counter anions on optical and microwave absorption characteristics of flexible copolymers

Engineering the structural architecture of materials is critical for the transmittance of visible light and absorb microwave radiation in various stealth and electronic applications. Transparent copolymers comprising of methyl methacrylate (MMA) and 2-(dimethylamino)ethyl methacrylate (DMAEMA) were synthesized at different compositions using reversible addition-fragmentation chain transfer (RAFT) polymerization. The copolymers exhibited a high percentage of light transmittance (>90%) within the visible range owing to the majority fraction of MMA units. The amine functionalities in the synthesized copolymers were ionized at room temperature by treating with dilute acids such as hydrochloric acid (HCl), trifluoroacetic acid (TFA), nitric acid (HNO3), tetrafluoroboric acid (HBF4), and hexafluorophosphoric acid (HPF6). The quaternization of the side-chain amine groups have resulted in a series of copolymer salts with an ion-pair complex. The investigation of the counter anion effect on the conductivity of the materials has been carried out to produce the highly transparent and conductive MMA-based copolymers. The presence of partially mobile Cl⁻ counter anions in the copolymers can result in conductance as high as 0.939 mS cm−1. Moreover, the optically transparent MMA-based copolymer salts have witnessed a high microwave absorption due to multiple reflections from structural and physical anisotropies.

Carbon fibers brominated with bromine cold plasma and liquid bromine for shielding applications: effect of the bromination method on microwave absorption characteristics

Brominated polyacrylonitrile-based carbon fibers (PAN CFs) were obtained by bromination with low-temperature bromine plasma and liquid bromine. The brominated PAN CFs with different bromine concentrations demonstrated different thermal stability and carbon surface oxidation. Besides, the bromination changes the microwave properties of PAN CFs in the X and Ka bands. The magnitude of losses S 21 and the voltage standing wave ratio (VSWR) showed complex dependencies on the bromine concentration and the bromination method used. Typically, adding more bromine degrades the shielding properties but improves the VSWR in the Ka-band.

Synthesis, structural, and microwave absorption properties of hematite (α-Fe2O3) and maghemite (γ-Fe2O3)

This work demonstrated the synthesis, structural, and microwave absorption properties of hematite (α-Fe2O3) and maghemite (γ-Fe2O3) nanopowders. The desired samples are successfully synthesized from the natural ironstone of Indonesia by using the coprecipitation method. The variations of acidic environments during the synthesis process (i.e., pH 6 and 7) were done to obtain the maghemite and hematite phases. The combination of x-ray diffraction (XRD) and scanning electron microscopy (SEM) measurements was used to investigate the crystal and microstructure, respectively. Meanwhile, the vector network analyzer (VNA) was performed to examine the microwave absorption properties at x-band frequency. The structural measurements of the samples confirmed the formation of single-phase maghemite and hematite phases for precipitation pH 6 and 7, respectively, which showed the change in morphology after the precipitation process and sphere-like agglomerated particles of samples. The results Debye–Scherrer equation indicates that the crystal size of precipitated samples is on the order of nanometers. The microwave absorption characteristics through VNA measurements showed enhanced microwave absorption properties after the precipitation process; the RL max of natural ironstone increased from −4.39 dB to −10,99 and −11,72 dB for S6 and S7 samples, respectively. Generally, the hematite and maghemite reveal the same pattern of absorption peaks. The RL max of natural ironstone, S6, and S7 samples were observed at 10.52, 11.04, and 11,06 GHz, respectively. These results revealed that the variation of acidic environments during the synthesis process influenced the structure and microwave absorption.

Electromagnetic wave absorption mechanism for nanocomposites of holmium orthoferrite decorated poly(3,4-ethylenedioxythiophene -5-cyanoindole)

New microwave absorbents with low thickness, minimum reflection loss and effective absorption bandwidth microwave absorption capabilities are urgently needed, but their realization remains still challenging. For this study, we used an innovative nanocomposite architecture comprised of polygonal HoFeO3 powder encapsulated with Poly(EDOT-co-CNIn) to create an electromagnetic wave absorption material optimized for the X-band frequency. Structural, morphological, magnetic, and microwave absorption characteristics of synthesized nanocomposite materials were evaluated utilizing XRD, FTIR, FESEM, VSM, and VNA techniques. With 35 wt.% filler loading, HoFeO3@Poly(EDOT-co-CNIn) composite absorber achieves a minimum reflection loss (RLmini) of -40 dB having 1.6 mm thickness, as measured by the waveguide method. Compared to other absorber samples optimal sample featured improved impedance matching abilities, better attenuation coefficient and a high absorption capacity. The optimal sample is also tested using the free-space measurement technique having dimensions of 200 mm × 200 mm and thus the findings show that they accord well with those of the waveguide approach. This work presents a design strategy for an effective microwave absorbent with practical measuring strategies for both waveguide and free-space setups.

Processing of HoFeO3 /Poly(EDOT-co-CIn) nanocomposite: Comprehensive analysis of the ku band absorption mechanism

By mixing the magnetic nanoparticles with dielectric materials such as polymers, particularly co-polymers, the complex permittivity and permeability of HoFeO3 nanoparticles may be readily controlled. The major goal of this research is to improve HoFeO3 nanoparticles' microwave absorption characteristics in the ku-band frequency by coating them with two different polymers that were created as co-polymers with intriguing dielectric properties. HoFeO3 nanoparticles were made using the co-precipitation technique, and the electromagnetic properties of the particles after coating with Poly(EDOT-co-CIn) were investigated. By using natural ferromagnetic resonance, interfacial polarization that occurs between components as well as filler and matrix, hopping, and multiple reflections and scattering within the matrix, coating by co-polymers can successfully boost the impedance match of HoFeO3 and subsequently raise its microwave absorption efficacy. According to findings, the HoFeO3/Poly(EDOT-co-CIn) nanocomposite has a minimum reflection loss (RLmini) value of −35 dB at 15.7 GHz, a maximum effective absorption bandwidth (EAB) of 5 GHz, and a thin thickness of just 0.8 mm. The feasible development of core-shell-based microwave absorbers is made possible by this method.

Microwave heating of graphene nanoplatelet polymer composites: Experimental and finite element study

AbstractCompared with contemporary electrofusion techniques that use embedded wires for Joule heating, microwave heating may facilitate the joining of thermoplastic polymer components, promising shortened fusion periods, superior heating uniformity, and reduced energy consumption. This study investigates the fabrication of multifunctional polylactide acid (PLA) composites with strong microwave absorption using graphene nanoplatelets (GNP). GNP/PLA nanocomposites were fabricated using a two‐step scalable manufacturing method, that is, solution blending and hot compression molding. The GNP content of the composites ranged from 0% to 8% by weight. The samples were characterized for dielectric permittivity, heat capacity, and electrical and thermal conductivity. Thermal imaging was used to investigate the efficacy of microwave heating in GNP/PLA nanocomposites as a function of microwave power and filler weight fractions. The microwave heating process in GNP composites was studied using multi‐physics finite element software. The experimental results were compared to numerical model predictions for maximum temperature and microwave energy absorbed. The produced nanocomposites were discovered to have strong microwave absorption characteristics and hence rapid heating, making this type of composite a prospective choice for gasket materials that facilitate fusion bonding for thermoplastic‐based components via localized heating.

Development of an efficient bi-layer absorber based on WSe2 and LaCoO3 nanopowders for X-band frequency: Computational and experimental validation

Herein, monolayer and bilayer absorbers were designed to investigate the microwave absorption characteristics of LaCoO3 and WSe2 nanomaterials. WSe2 monolayer sample showed better absorption capabilities as compared to LaCoO3 single-layer sample. The microwave absorption effectiveness of bilayer absorbents was scrutinized using a simulation approach. The simulation results demonstrated that a bilayer absorber composed of LaCoO3 as the bottom layer (0.5 mm thickness) and WSe2 on the top layer (1.5 mm thickness) can obtain a minimum reflection loss (RLmini) of −42.5 dB with an effective absorption bandwidth (EAB) of 2.8 GHz (12.4 GHz–9.6 GHz) at 10.8 GHz. Simulation predictions and experimental findings were juxtaposed; which accord with one another quite well. The findings demonstrate that the exceptional microwave absorption performance of the bilayer absorber may be attributed to its layered architecture. Our study presents a simple synthetic method and new perspectives on engineering a bilayer absorber with simulation and experimental justification.

Bionic octopus structure Inspired Stress-Driven reconfigurable microwave absorption and multifunctional compatibility in infrared stealth and De-icing

Constructing intelligent materials with self-adjustable microwave absorption, infrared stealth and de-icing performances has been of great importance to make the devices and equipment adapt to the variable electromagnetic environment. However, the concurrent achievement of desired microwave absorption, timely switching and multifunctional compatibility is the key issue to be urgently resolved but still remains an enormous challenge. Inspired by the flexible octopus tentacles biomorph, the bionic structure of carbon foam coated by Fe3C particles (CCF) is synthesized via an in-situ carbothermal reduction. Wherein, the carbon foams serve as the basic octopus tentacle skeleton and the magnetic Fe3C particles act as suckers on the surface, providing both sufficient dielectric and magnetic loss by regulating N-defects elaborately. As a result, the CCF hybrids reveal obviously compressive-sensitive microwave absorption characteristics, accompanied by tremendous variations of permittivity and permeability. Moreover, the excellent cyclic mechanical stability, high thermal management and de-icing properties are also explored, which reveals the great potential for multifunctional applications as smart microwave absorbers in multifunctional fields.

PANI-coated YIG/CFO hybrid composites as advanced electromagnetic wave absorber through X-band

Polyaniline (PANI)-coated Y3Fe5O12(YIG)/CoFe2O4(CFO) hybrid composites were synthesized via sol-gel and oxidative polymerization methods to achieve advanced microwave absorption properties. The structural, morphological, magnetic, and microwave absorption characteristics of the resulting samples were analyzed by performing X-ray diffraction (XRD), scanning electron microscopy (SEM), vibration sample magnetometer (VSM), and vector network analyzer (VNA). XRD results revealed that CFO and YIG have cubic crystal structures with Fd3m and Ia3d space symmetry, respectively, with an average crystallite size of 35.3 nm and 42.9 nm. The Ferro/ferrimagnetic signals were detected from the ferrite samples' room temperature magnetic hysteresis loops. The incorporation of PANI and YIG into the composites resulted in a decrease in their magnetic saturation (Ms) and coercive field (Hc) values. VNA measurements demonstrated that nearly all samples achieved 90% absorption (≤−10 dB) of incident electromagnetic waves throughout the X-band frequency range. The minimum reflection loss (RLmin) value reaches − 47.34 dB at 8.14 GHz, with an effective bandwidth of 4.00 GHz, covering the entire X-band and beyond. These impressive absorption characteristics suggest that the manufactured composites possess potential as viable candidates for defense applications conducted at X-band frequency.

Variable-Temperature Regulation of NiCo2S4/Mn3O4 Nanostructured Composites for High-Performance Microwave Absorption

Currently, transition-metal oxides and sulfides remain widely used in the research on electromagnetic-wave-absorbing materials. In the present work, NiCo2S4/Mn3O4 nanostructured composites were prepared by a series of hydrothermal and annealing processes and a strategy for the preparation of morphologically controllable absorbers was developed. The results show that the nanostructure design of Mn3O4 was achieved by the variable-temperature strategy, and the Mn3O4 shell was about 500 nm when the temperature reached 160 °C, and the composite had a uniform shell–core structure. In addition, the effects of microscopic morphology, lattice defects, and heterogeneous interfaces on electromagnetic parameters are investigated. In conclusion, the multiple loss mechanism and excellent impedance matching ability synergistically enable the NiCo2S4/Mn3O4 nanostructured composite to achieve excellent microwave absorption characteristics, with a minimum reflection loss of −54.4 dB and a maximum effective absorption bandwidth of 5.36 GHz. This work provides a new perspective on the design of wave-absorbing materials for shell–core structures.

Fabrication of Zn0.25Co0.75(MnZr)xFe2–2xO4 spinel ferrites as broadband microwave absorbers in 26.5–40 GHz frequency range

With the advent of 5 G technologies, developing microwave-absorbing materials is an urgent need to address the issues caused by harmful electromagnetic pollution. For this purpose, a novel ferrite series with composition Zn0.25Co0.75(MnZr)xFe2–2xO4 (0.05 ≤ x ≤ 0.25, ∆x = 0.05) was successfully synthesized using the sol-gel citrate route. Also, the effects of the co-substitution of Mn and Zr on the structural, morphological, magnetic, electromagnetic, and microwave absorption characteristics of zinc-cobalt spinel ferrites were studied. The X-ray diffraction patterns indicated the formation of nanoparticles having a cubic spinel lattice structure. Coercivity was found to decrease whereas saturation magnetization increased with the increasing level of substitution from MZ 0.05 to MZ 0.25. In Ka-band, the experimental results showed that MZ 0.15 outperformed all the prepared compositions by exhibiting a minimum reflection loss of −27.99 dB and an efficient absorption bandwidth of 6.5 GHz at a narrow sample thickness of 2.2 mm. The simulation performed by varying the sample thickness revealed that the high values of gross loss tangent and excellent impedance matching lead the composition MZ 0.20 to achieve the optimum value of reflection loss of − 42.71 dB at a matching frequency of 29.20 GHz and a matching thickness of 1.1 mm. These findings suggested that the fabricated materials prove to be efficient absorbers in the 26.5–40 GHz frequency range.

Investigations of microwave absorption performance of bi-layer absorber composed of FeWO4 & BiVO4 nanocomposite powder in 2–18 GHz

Optimization necessitates every feature to be scrutinized associated with enhancement for microwave absorption. So, interplay between simulation and experiment is a significant aspect to find optimal findings in this regard. Herein, microwave absorption characteristics of as-prepared FeWO4 and BiVO4 nanomaterials were investigated by preparing mono layer and bilayer samples. For the bilayer samples, simulation technique was used to regulate microwave absorption efficiency. Using simulation technique, bilayer sample has achieved a minimum reflection loss (RLmin) of −42 dB with BiVO4 as a top layer (0.6 mm thickness) and FeWO4 as a bottom layer (0.8 mm thickness) with effective absorption Bandwidth (EAB) of 13 GHz (15–2 GHz) at 8.2 GHz frequency. The results show that the layered architecture of the absorbent is substantially responsible for its remarkable microwave absorption efficiency. Simulated results of the bilayer sample were also verified with experimental findings. This work provides a facile synthesis route, novel insights into the design of bilayer absorbent as well as simulation and experimental support for high-performance microwave bilayer absorber.

Recent advances in microwave-absorbing materials fabricated using organic conductive polymers

Microwave-absorbing materials are widely utilized in military and civilian applications. Moreover, their environmental potential to refine electromagnetic pollution has promoted their importance. An ideal conjugated organic polymer for use as a microwave-absorbing material should possess high porosity, low density, a long conjugated backbone, a narrow energy band gap, proper conductive and relaxation loss, and vast specific surface area. This review describes the conductive polymer types used as microwave-absorbing material and their composites toward improving microwave-absorbing capability. Additionally, recent developments in synthetic strategies and structural properties of pure carbon-based microwave-absorbing materials and other conjugated structures having heteroatoms in their chains are discussed. In the field of microwave absorbers, the predominant microwave-absorbing mechanisms among conductive polymers and their composites as well as the special mechanisms for tuning microwave-absorbing characteristics, including metamaterial and quasi-antenna features, are dissected. This review sheds new light on architecting low-density and high-performance microwave-absorbing structures and offers new prospects in tailoring conjugated polymers based on their dominant mechanisms.

Tunable Electromagnetic and Microwave Absorption Properties of Magnetic FeNi3 Alloys.

Magnetic materials have a very broad application prospect in the field of microwave absorption, among which soft magnetic materials become the focus of magnetic materials research because of their high saturation magnetization and low coercivity. FeNi3 alloy has been widely used in soft magnetic materials because of its excellent ferromagnetism and electrical conductivity. In this work, FeNi3 alloy was prepared by the liquid reduction method. The effect of the filling ratio of FeNi3 alloy on the electromagnetic properties of absorbing materials was studied. It is found that the impedance matching ability of FeNi3 alloy is better when the filling ratio is 70 wt% than that of other samples with different filling ratios (30-60 wt%), showing better microwave absorption characteristics. When the matching thickness is 2.35 mm, the minimum reflection loss (RL) of FeNi3 alloy with a 70 wt% filling ratio reaches -40.33 dB, and the effective absorption bandwidth is 5.5 GHz. When the matching thickness is between 2 and 3 mm, the effective absorption bandwidth ranges from 7.21 GHz to 17.81 GHz, almost covering the whole X and Ku bands (8-18 GHz). The results show that FeNi3 alloy has adjustable electromagnetic properties and microwave absorption properties with different filling ratios, which is conducive to selecting excellent microwave absorption materials.

Dual-pathway optimization on microwave absorption characteristics of core–shell Fe3O4@C microcapsules: Composition regulation on magnetic core and MoS2 nanosheets growth on carbon shell

Core-shell Fe3O4@C composites with unique configuration and complementary loss mechanisms are widely considered as a kind of prospective functional materials in the field of microwave absorption. However, the balance between core–shell configuration and intrinsic loss is always a thorny problem on the way of good microwave absorption characteristics. Herein, we propose a dual-pathway optimization strategy to consolidate the electromagnetic functions of core–shell Fe3O4@C microcapsules for the first time. On one hand, the chemical composition of magnetic core is finely regulated from Fe3O4 to metal Fe, and it is found that both magnetic loss and dielectric loss can be strengthened effectively through the partial reduction of Fe3O4 core. On the other hand, MoS2 nanosheets are closely anchored on the surface of carbon shell, which can bring more powerful interfacial polarization and dipole polarization to compensate the insufficient dielectric loss caused by the limited thickness and graphitization degree of carbon shell. With the multiple benefits from the dual-pathway optimization strategy, the optimal composite will present good microwave absorption performance, whose effective absorption bandwidth (EAB) and minimum RL value are 5.4 GHz (d = 1.8 mm) and −36.1 dB (5.9 GHz, 4.0 mm), respectively. In particular, its specific EABs (EAB per unit thickness) in different bands are superior to those of most microwave absorbing materials with similar chemical composition. These results demonstrate that this dual-pathway optimization will open a new avenue to enhance microwave absorption performance of core–shell composites in the future.

Pseudobrookite Fe2-2xCoxTi1-½xO5: Structural, magnetic phase transformation and reflection loss characteristic

Single-phase pseudobrookite Fe2-2xCoxTi1-½xO5 (x = 0, 0.1, 0.2, and 0.4) with an orthorhombic structure has been successfully synthesized using a solid reaction and sintering at 1000 °C. Pseudobrookite Fe2-2xCoxTi1-½xO5 is an element that is abundant on earth and is attracting rapidly growing interest as a very promising candidate for the application of microwave absorbing materials. This paper studies the performance of exchange coupling in addition to the structural properties and microwave absorption characteristics of pseudobrookite Fe2-2xCoxTi1-½xO5. Qualitative and quantitative analysis of the X-ray diffraction (XRD) pattern show that all samples were single-phase pseudobrookite Fe2TiO5 with a space group of C m c m. The presence of Co causes the expansion of the lattice parameter with an indicator of an increase in the value of the unit cell volume as the composition of Co in the structure increases. Particle morphology and elemental composition were also observed using a scanning electron microscope (SEM), and energy dispersive spectroscopy (EDS). The presence of Co2+ dopant ions does not affect the shape and size of the particles, while the crystallite size increased with the increase in the content of Co2+ dopant ions in the structure and Co elements of 1.82, 2.81, and 5.69 at% have been detected, which are contained in the composition x = 0.1, 0.2, and 0.4, respectively. The presence of the Co2+ dopant ion it stimulates the rearrangement of the cationic distribution in both tetrahedral and octahedral sites which will have an impact on changes in the magnetic properties of this pseudobrookite. Magnetic properties were analyzed by measuring magnetization (M) against a magnetic field (H) at 300 K (RT). The spontaneous magnetization at room temperature in pseudobrookite Fe2-xCoxTi1-½xO5 is ∼2.55, 7.41 and 8.67 emu/g for compositions of x = 0.1, 0.2 and 0.4, respectively. The coercive field is ∼424, 356 and 284 Oe for compositions of x = 0.1, 0.2 and 0.4, respectively. The presence of Co in the structure causes a magnetic phase transformation from paramagnetic to ferromagnetic behavior at room temperature. This ferromagnetic behavior can be explained due to the strengthening of indirect exchange interactions of Ti/Co – O – Fe/Co in addition to the interactions of Fe/Co – O – Fe/Co and Ti/Co – O – Ti/Co, as well as changes in the degree of inversion of this pseudobrookite structure, due to the presence of magnetic ion dopants. Magnetic parameters both Ms, Mr, and Hc show an increase with increasing Co2+ ion content at room temperature. This magnetic parameter is very important at room temperature to determine the absorption characteristics of microwaves through the resonant frequency. Microwave absorption characteristics are measured in the 8–12 GHz frequency range. The best reflection loss (RL) peaks were obtained at composition x = 0.1 of -24 dB at 10.6 GHz frequency. The presence of Co2+ dopant ions can produce a very significant increase in RL almost 3 times at the same absorption frequency. This increase in reflection loss can be attributed to the effect of the magnetic phase transformation of this material which has been described accordance of the magnetic coupling exchange interaction, which in turn changes the magnitude of the relative permeability value of this material complex.

Development of a Graphical User Interface for Reflection Loss Calculation in Perovskite-RGO based Microwave Absorbing Composites

In this paper, a novel method is investigated wherein the theoretical and mathematical analysis of the perovskite-Reduced Graphene Oxide (RGO) based composite microwave absorber is used to form a machine learning model using linear regression to predict the reflection loss and the effective dielectric permittivity of a selected perovskite compound in an RGO-based composite. At first, the theoretical derivation is carried out to find a mathematical relationship between the reflection loss and the dielectric permittivity of the composite and the cationic radii of the perovskite structure, which is then used to form the base for the machine learning model to directly calculate the microwave absorption characteristics from the atomic parameters of the given composite structure. Linear regression is used for the machine learning algorithm which is verified with an R2 of 0.869 with the atomic radii as the input parameters. The model is further used to develop a Graphical User Interface (GUI) to make the prediction more appealing and user-friendly. The current paper provides a new approach to the integration of theoretical knowledge with advanced computing tools to form innovative predictive tools for current microwave-absorbing materials.

Tuning the microwave absorption characteristics of r-GO toughened epoxy composites via SiC-induced phase separation

Tuning the microwave absorption characteristics of r-GO toughened epoxy composites via SiC-induced phase separation

UTILIZATION OF Zn-DISPERSED WASTE MATERIALS FOR REALIZING THIN META-STRUCTURE WITH IMPROVED MICROWAVE ABSORPTION

In the present work, emphasis has been given on the utilization of waste materials to make cost-effective microwave absorbing composites. Rice husk and exhausted activated charcoal (EAC) were used as waste material, where rice husk is a form of agricultural waste and exhausted activated charcoal was extracted from an exhausted water filter cartridge. Thereafter, zinc metal powder was dispersed in different weight ratios in the mixture of rice husk and exhausted activated charcoal using a planetary ball mill. The X-ray fluorescence (XRF), X-ray diffraction (XRD), and the particle size analyses were done to analyze element composition and particle size. For dielectric properties analysis, vector network analyzer (VNA) was used. Results reveal that composites have the potential for microwave absorption in 2-18 GHz frequency range, sample RHZ 3 having 6 wt.% Zn content gives the maximum reflection loss value of -21.27 dB at 9.2 GHz for a material thickness of 13.9 mm. The experimental results were then used to design a metamaterial microwave absorber. The simulated results show the good microwave absorption characteristics. The metamaterial absorber showed an absorption bandwidth of around 4.1 GHz which ranges from frequency of 14.1 GHz to 18.2 GHz at total thickness of 1.7 mm.

Microwave absorption characteristics of cobalt doped zinc spinel ferrites in Ku-band (12.4–18 GHz)

This research study targets to fabricate microwave absorbers with narrow sample thickness, strong absorption power and broad bandwidth simultaneously. The zinc-cobalt spinel ferrites with compositional formula Zn1-xCoxFe2O4 (x = 0.00, 0.25, 0.50, 0.75 and 1.00) are successfully synthesized via sol–gel citrate route by sintering at 1000 °C. Vector network analyzer is employed to determine dielectric permittivity εr=ε′-jε" and magnetic permeability μr=μ′-jμ" in Ku-band. Enhancement in dielectric losses from 0.3051 to 0.4066 and magnetic losses from 0.0087 to 0.5911 with increasing cobalt concentration from x = 0.00 to x = 1.00 at 12.4 GHz frequency helps in achieving good absorption. Normalized wave impedance and quarter wavelength model are used to maximize absorption or minimize reflection. Significant absorption is achieved by tuning thickness of the sample from 1.8 mm to 3 mm. The composition x = 0.75 exhibits superior absorbing properties by showing reflection loss as low as −31.45 dB along with −10 dB bandwidth of 5.6 GHz at a matching thickness of 2.2 mm. The fabricated ferrite samples are proved to be promising applicants for absorption of electromagnetic interference (EMI) in radar and stealth technology.