X-band dielectric and microwave-absorbing properties of the incompletely carbonized polyacrylonitrile cloth

2012 ◽  
Vol 129 (3) ◽  
pp. 1068-1073 ◽  
Author(s):  
Zhibin Huang ◽  
Wenbo Kang ◽  
Xiufeng Tang ◽  
Yuchang Qing ◽  
Fa Luo
Keyword(s):  
Microwave Absorbing Properties ◽  
X Band ◽  
Microwave Absorbing

scholarly journals Structural, Magnetic, and X-Band Microwave Absorbing Properties of Ni-Ferrites Prepared Using Oxidized Mill Scales

2021 ◽  
Vol 21 (1) ◽  
pp. 27
Author(s):  
Ardita Septiani ◽  
Novrita Idayanti ◽  
Tony Kristiantoro ◽  
Dedi Mada ◽  
Nadya Larasati Kartika ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Single Phase ◽  
Raw Materials ◽  
Energy Dispersive Spectrometer ◽  
Milling Process ◽  
Microwave Properties ◽  
Heating Process ◽  
Microwave Absorbing Properties ◽  
X Band ◽  
Microwave Absorbing

This study aims to evaluate the structural, magnetic, and microwave absorbing properties at the X-band region of oxidized mill scales as by-product derived from a steel making process by means of a facile solid-state reaction. The oxidized mill scales were heated at 600 °C for 4 h followed by mixing with NiO. A calcination process took place at 900 °C and sintering process were conducted at 1260 °C with a milling process conducted in between the heating process. X-ray diffraction (XRD) and scanning electron microscope (SEM) equipped with energy dispersive spectrometer (EDS) were employed to evaluate the structural properties of the Ni-ferrites samples. Remacomp measurement were conducted to evaluate the magnetic properties and vector network analyzer (VNA) to measure its microwave properties. A single phase of NiFe2O4 was confirmed by XRD data. The site occupancies derived from the Rietveld refinement shows that the Ni:Fe:O ratio deviates from the 1:2:4 ratio as that suggests vacancies formed in the Ni2+ and Fe3+ that lowers the unit cell density to 5.08 g/cm3 that further confirmed by EDS measurement. The coercivity of 11 kOe is also higher than the bulk NiFe2O4¬ prepared by the chemical grade raw materials. The reflection data of the microwave properties at X-band of 8-12 GHz do not shows significant absorptions. This study suggests that the selected preparation method yields a single phase, however with the significant crystallographic defects and has less ‘soft’ magnetic properties compared to NiFe2O4 prepared using chemical grade by previous study.

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

2020 ◽  
Vol 2 (12) ◽  
Author(s):  
Monika Rani ◽  
Kamaljit Singh Bhatia ◽  
Harjitpal Singh ◽  
Harsimrat Kaur ◽  
Nancy Gupta
Keyword(s):  
Suitable Material ◽  
Microwave Absorbing Properties ◽  
X Band ◽  
Microwave Absorbing

Microwave absorbing properties of iron nanowire at x-band frequencies

2011 ◽  
Vol 109 (7) ◽  
pp. 07B527 ◽  
Author(s):  
Ruey-Bin Yang ◽  
Wen-Fan Liang ◽  
Wei-Syuan Lin ◽  
Hong-Ming Lin ◽  
Chien-Yie Tsay ◽  
...  
Keyword(s):  
Microwave Absorbing Properties ◽  
X Band ◽  
Microwave Absorbing

Sr hexaferrite/Ni ferrite nanocomposites: Magnetic behavior and microwave absorbing properties in the X-band

2015 ◽  
Vol 157 ◽  
pp. 124-129 ◽  
Author(s):  
Silvia E. Jacobo ◽  
Paula G. Bercoff ◽  
Carlos A. Herme ◽  
Leandro A. Vives
Keyword(s):  
Magnetic Behavior ◽  
Microwave Absorbing Properties ◽  
X Band ◽  
Microwave Absorbing

scholarly journals Engineering of dielectric composites on electromagnetic and microwave absorbing properties for operation in the X-band

2020 ◽  
pp. 2150001
Author(s):  
Bhoopendra Singh ◽  
Vivek Pratap ◽  
Mohit Katiyar ◽  
S. M. Abbas ◽  
Y. K. Sharma ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Network Analyzer ◽  
Frequency Range ◽  
Melt Mixing ◽  
Band Frequency ◽  
Microwave Absorbing Properties ◽  
X Band ◽  
Mixing Method ◽  
Microwave Absorbing ◽  
Potential Use

In this study, carbon black (CB) powder-loaded polyurethane (PU) composites (CB–PU composites) were prepared by melt mixing method with different volume percentages (45, 50, 55, 58 and 61 vol.%) of CB in the PU matrix. The prepared CB–PU composites had been further studied for surface morphology using the field-emission scanning electron microscopy (FESEM) technique. Dielectric properties in terms of real permittivity ([Formula: see text] and imaginary permittivity ([Formula: see text] of the fabricated composites were computed using an Agilent E8364B vector network analyzer in the frequency range of 8–12 GHz ([Formula: see text]-band). Dielectric loss factor of the prepared CB–PU composites was computed in terms of the dielectric loss tangent (tan [Formula: see text] = [Formula: see text]/[Formula: see text]. Microwave absorbing properties were appraised in terms of the reflection loss (RL) which in turn was calculated for varying thicknesses of the prepared composites from the measured real and imaginary permittivity data. The minimum RL was observed as −20.10 dB for the absorber with a thickness of 2.2 mm and the bandwidth achieved was 1.92 GHz for RL [Formula: see text]10 dB. Based on the above results these CB–PU composites have potential use as effective microwave absorbers in 8–12-GHz ([Formula: see text]-band) frequency range.

A protective polyester fabric with magnetic properties using mixture of carbonyl iron and nano carbon black along with aluminium sputtering

2016 ◽  
Vol 47 (5) ◽  
pp. 674-685 ◽  
Author(s):  
Maedeh Simayee ◽  
Majid Montazer
Keyword(s):  
Magnetic Properties ◽  
Carbon Black ◽  
Polyethylene Terephthalate ◽  
Carbonyl Iron ◽  
Polyester Fabric ◽  
Microwave Absorbing Properties ◽  
X Band ◽  
Sputter Coating ◽  
Nano Carbon ◽  
Microwave Absorbing

In the present work, polyester fabric with protective and magnetic properties is introduced using mixture of micro magnetic carbonyl iron powder and nano carbon black through pad-dry-cure method and sputter coating with aluminium (Al). This leads to X-band microwave absorbing properties as the great demand for protective garment. The morphology, static magnetic and X-band microwave absorbing properties of the treated fabrics were characterized by field emission scanning electron microscopy, vibrating sample magnetometer and vector network analyzer in the range of 8.2–12.4 GHz. Normal-angle X-ray diffraction was used to study the crystalline structure of treated PET fabric. Compared with the blank polyethylene terephthalate fabric without Al sputter coating, the presence of nano carbon black and carbonyl iron powder on the polyethylene terephthalate fabric sputter coated with aluminum exhibited higher microwave absorbing properties particularly in the primary range of 8.2–12.4 GHz. The results in the whole frequency range investigated were remarkable; however, the reflection loss was found to be lower than −5.9 dB in the entire frequency. The maximum reflection loss value was reached to −7.7 dB at the frequency of 8.2 GHz. Overall, the co-application of nano carbon black and carbonyl iron powders on the polyethylene terephthalate fabric opens up a new coating method for X-band microwave absorbing properties.

Preparation and Microwave Absorbing Properties of Natural Ferrites from Corrosion Product as Radar Absorber Materials in X-Band

2020 ◽  
Vol 855 ◽  
pp. 286-292
Author(s):  
Mashuri ◽  
M.A. Faisal
Keyword(s):  
Corrosion Product ◽  
Reflection Loss ◽  
Ferrous Metal ◽  
Soft Magnetic ◽  
Band Frequency ◽  
Microwave Absorbing Properties ◽  
X Band ◽  
Microwave Absorbing ◽  
Magnetite Phase ◽  
Maximum Reflection Loss

Rust is the by product of oxidation on ferrous metal. Rust is extremely harmful and can’t be avoided. Due to that reason for added values on rust a research titled utilizing corrosion product as absorber for microwave on X-band frequency is done. This research goals are to determine the ability of rust to absorb radar waves by maximum reflection loss values. The study was conducted by taking a powder natural ferrites of rust from corroded ferrous metal in Surabaya, Malang, Bangkalan and then later separated by using a 0.1 T hard magnet. The XRF, XRD and VSM characterization showed that rust powder sample has chemical compound of ferrites (Fe3O4) with magnetite phase and a soft magnetic with Ms = 8 emu/g. Based on the measurement microwave absorbing by VNA showed that maximum reflection loss of natural ferrites Surabaya, Malang, Bangkalan respectively-20.15 dB, -12.64 dB and-6.75 dB, at matching frequency 11 GHz and width frequency 3 GHz.

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