Elucidation of microwave absorption mechanisms in Co–Ga substituted Ba–Sr hexaferrites in X-band

Kaur, Harmeet; Singh, Charanjeet; Marwaha, Anupma; Narang, Sukhleen Bindra; Jotania, Rajshree B.; Mishra, Sanjay R.; Bai, Yang; Raju, K. C. James; Singh, Dharmendra; Ghimire, Madhav; Dhruv, Preksha N.; Sombra, A. S. B.

doi:10.1007/s10854-018-9638-3

Cited by 42 publications

(9 citation statements)

References 40 publications

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“…Thus there exists a relationship between AC (frequency dependent; complex permittivity and permeability) and DC properties (frequency independent, Hysteresis). As shown in table 1, variation in µ″ [21] followed the variation in M s /H a concluding that Z in , and therefore microwave absorption, is dependent on the hysteresis parameters. Therefore mechanisms of M s and H a need to be known and primary depend on preferential site occupancy of dopant ions.…”

Section: Hysteresis Parametersmentioning

confidence: 71%

“…In Fig. 1, plots depict the RL (microwave absorption) versus frequency for simulated thickness in Co-Ga doped M-type Ba-Sr hexagonal ferrite [21]. RL dips in compositions x = 0.2 moves along with the low frequency region with the increment in the thickness and vice-versa.…”

Section: Quarter Wavelength Mechanismmentioning

confidence: 99%

“…In other words, µ″ [21] varies in accordance with M s /H a and input impedance (Z in ), which involves µ″ in equation 8, can be tuned by M s /H a . Thus there exists a relationship between AC (frequency dependent; complex permittivity and permeability) and DC properties (frequency independent, Hysteresis).…”

Section: Hysteresis Parametersmentioning

confidence: 99%

“…Fig.2 Difference of dielectric loss and magnetic loss tangent (Rights and PermissionSpringer-Nature)[21].…”

mentioning

confidence: 99%

See 3 more Smart Citations

Microwave Absorption in Ceramics: Different Mechanisms and its Optimization

Narang

Singh

Jotania

2019

Engineering Magnetic, Dielectric and Microwave Properties of Ceramics and Alloys

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In the current scenario of technological devices, industrial, domestic and military applications involve high speed electronic devices operating in GHz region. The microwave absorbers are the key materials incorporated to mitigate electromagnetic interference emanated from high speed electronic devices. In the present chapter, we have discussed microwave absorption mechanisms which are not much explored analytically as well as comprehensively. The necessary mathematical models responsible for absorption have been elaborated with pertinent mechanisms. Both material science and engineering aspects have been covered to elaborate on the conceptual understanding of optimization of microwave absorptions in any ceramics.

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Section: Hysteresis Parametersmentioning

confidence: 71%

Section: Quarter Wavelength Mechanismmentioning

confidence: 99%

Section: Hysteresis Parametersmentioning

confidence: 99%

“…Fig.2 Difference of dielectric loss and magnetic loss tangent (Rights and PermissionSpringer-Nature)[21].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Microwave Absorption in Ceramics: Different Mechanisms and its Optimization

Narang

Singh

Jotania

2019

Engineering Magnetic, Dielectric and Microwave Properties of Ceramics and Alloys

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“…We have already explored the results of synthesized M-type hexagonal ferrite with composition Ba 0.5 Sr 0.5 Co x Ga x Fe 12-2x O 19 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) by ceramic method at temperature 1150 °C [24]. In this paper we have improved the results by varying the temperature conditions to 1100 °C and microwave absorption property has been evaluated using impedance matching and Quarter wavelength mechanism.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of suitable material for microwave absorbing properties in X-band

et al. 2020

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Synthesization of M-type hexaferrite with composition Ba 0.5 Sr 0.5 Co x Ga x Fe 12-2x O 19 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) has been performed at temperature 1100 °C for 15 h by adopting conventional ceramic method. For analyzing the structure of synthesized material, the X-ray diffraction (XRD) method has been used. Besides that its properties are observed by using different characterization techniques like VSM (vibrating sample magnetometer), Fourier Transform Infrared (FTIR) spectra and VNA (Vector network analyzer), SEM (scanning Electron Microscopy), Energy-dispersive X-ray spectroscopy (EDAX). Microwave absorption property has been investigated using quarter wavelength and impedance matching mechanism in the X-Band range (8.2-12.4 GHz). From the results obtained, it was being observed that microwave absorption was best at doping concentration x = 0.4 i.e. −33.36 dB reflection loss at thickness 2.0 mm and frequency 9.62 GHz. The synthesized samples can be used for different possible applications in X-Band as narrowband & broadband absorbers and EMI shielding devices. The main applications are Electromagnetic Compatibility, microwave filters, network switches, Radar cross-section reduction (RCS) in the military, electronic enclosures and antenna applications.

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Radar Infrared‐Compatible Camouflage Performance of High‐Entropy Alloy Coating Enhanced by Double‐Layer Hexagonal Metasurface

et al. 2023

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Recently, high‐entropy alloy (HEA) microwave‐absorbing materials have attracted extensive attention. Herein, a double‐layer structure consists of a low‐infrared emission metasurface and a FeCoNiMn0.5Si0.5Al0.5 HEA coating with enhanced microwave absorption performance is designed. The upper metasurface consisting of periodic hexagonal aluminum structural unit has excellent low‐infrared emission properties, while enabling selective transmission and absorption enhancement of radar waves. The emissivity of the low‐infrared emitting layer is lower than 0.2, and the metastructure on its surface affects more on the high‐frequency absorption performance. The bottom layer made of HEA coating with 1 mm hexagonal etching structure has an effective absorption bandwidth of 2.8 GHz, and its reflection loss (RL) can reach −42 dB. There is a certain fit relationship between the unit size of the periodic structure and the absorption performance of the underlying coating. For the coatings with high‐frequency RL peaks, a larger unit size of the periodic structure will lead to an obvious improvement on the absorption performance. A broad application prospect for multiband compatibility stealth is provided.

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Elucidation of microwave absorption mechanisms in Co–Ga substituted Ba–Sr hexaferrites in X-band

Cited by 42 publications

References 40 publications

Microwave Absorption in Ceramics: Different Mechanisms and its Optimization

Microwave Absorption in Ceramics: Different Mechanisms and its Optimization

Synthesis of suitable material for microwave absorbing properties in X-band

Radar Infrared‐Compatible Camouflage Performance of High‐Entropy Alloy Coating Enhanced by Double‐Layer Hexagonal Metasurface

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