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

Abstract

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.

New Approach to Designing Functional Materials for Stealth Technology: Radar Experiment with Bilayer Absorbers and Optimization of the Reflection Loss

“…On the other hand, the HF powder samples were synthesized by own at the laboratory and were selected for this work because they have an extended reputation as microwave absorbers. [ 8–11 ]…”

“…To have practical importance, the absorber must be broadband, see, for example, refs. [8,9]. Our focus is on microwave absorption by magnetic bilayers.…”

Tuned MWCNT/CuO/Fe3O4/Polyaniline nanocomposites with exceptional microwave attenuation and a broad frequency band

“…Hence, exchange resonance and eddy current loss are involved in magnetic dissipation, occurring at high frequencies (> 13 GHz) 33 . Since ferrites have a relatively high electrical resistance 40 , they have a low dielectric loss and low eddy current loss. However, by incorporating CuO, a semiconductor with a narrow bandgap, to form a CuO/Fe 3 O 4 hybrid, conductivity and eddy current loss may be increased.…”

MWCNT/CuO/Fe3O4/Polyaniline Nanocomposites with Remarkable Microwave Attenuation and Broad Frequency Band by Tuned Composition

“…So, exchange resonance and eddy current loss are involved in magnetic dissipation, which occurs at high frequencies (> 13 GHz) [32]. Since ferrites have a relatively high electrical resistance [39], they have a weak dielectric loss and low eddy current loss. However, introducing CuO, a semiconductor with a narrow bandgap, to form CuO/Fe 3 O 4 hybrid, may improve conductivity and therefore, increase eddy current loss.…”