Researches on the Formation and Thermal Treatment of (Zn0.3Co0.7)2-W Type Ferrite

2013 ◽  
Vol 706-708 ◽  
pp. 248-253
Author(s):  
Ling Liu ◽  
Zheng Xiong ◽  
Hui Hu
Keyword(s):  
Crystal Structure ◽  
Thermal Treatment ◽  
Treatment Condition ◽  
Element Composition ◽  
Vector Network Analyzer ◽  
Hexagonal Ferrite ◽  
Thermal Treatments ◽  
Network Analyzer ◽  
Electromagnetic Parameters ◽  
Thermal Treatment Condition

W-type hexagonal ferrite BaZn0.6Co1.4Fe16O27 was prepared by the method of coprecipitation with flux. Various products were prepared by different thermal treatments. The microstructure, element composition, crystal structure, phases and dynamic electromagnetic parameters of the products were analyzed by SEM, EDS, XRD and the microwave vector network analyzer. The formation of the ferrite was studied and the optimal thermal treatment condition was confirmed, under which pure tiny W-type hexagonal ferrite powders were achieved.

Preparation and Electromagnetic Property of Hexagonal W-Type Ferrite Obtained by the Sol-Gel Method

2011 ◽  
Vol 474-476 ◽  
pp. 1044-1048
Author(s):  
Zheng Xiong ◽  
Zhu Xi ◽  
Zhang Li Jun
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
Sol Gel ◽  
Electromagnetic Property ◽  
Element Composition ◽  
Vector Network Analyzer ◽  
Network Analyzer ◽  
Electromagnetic Parameters ◽  
Gel Method ◽  
Sol Gel Method

Hexagonal W-type ferrite BaZn0.6Co1.4Fe16O27 was prepared by the sol-gel method. The formation, microstructure, element composition and phases were analyzed by TG-DTA, SEM, EDS and XRD. The electromagnetic parameters and microwave absorption capability were measured by the microwave vector network analyzer. The results showed that the reflection loss of the ferrite BaZn0.6Co1.4Fe16O27 in the spectrum of 8-18GHz came up to -10dB and came up to -20dB in the spectrum of 9.5-16.4GHz.

Preparation and Electromagnetic Property of Hexagonal W-Type Ferrite Obtained by the Method of Coprecipitation with Flux

2011 ◽  
Vol 228-229 ◽  
pp. 645-650 ◽  
Author(s):  
Zheng Xiong ◽  
Zhu Xi ◽  
Zhang Li Jun
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
Electromagnetic Property ◽  
Element Composition ◽  
Vector Network Analyzer ◽  
Network Analyzer ◽  
Electromagnetic Parameters

Hexagonal W-type ferrite BaZn0.6Co1.4Fe16O27 was prepared by the method of coprecipitation with flux. The formation, microstructure, element composition and phases were analyzed by TG-DTA, SEM, EDS and XRD. The micrograph showed that the ferrite grains appeared to be hexagonal schistose texture obviously and the dimension of the grains was about 10μm. The product powders were composed mainly of BaZn0.6Co1.4Fe16O27 and few other phases such as α-Fe2O3, M-type ferrite (BaFe12O19) and S-type ferrite (MeFe2O4, Me for Zn or Co) were also found in the product. Electromagnetic parameters and microwave absorption capability were measured by the microwave vector network analyzer. The results showed that the reflection loss (RL) of the sample came up to -10dB in the spectrum from 8GHz to 18GHz and -20dB in the spectrum from 9.5GHz to 16GHz.

The Electromagnetic Properties of Different Urchinlike Ni Nanostructures

2012 ◽  
Vol 722 ◽  
pp. 47-51
Author(s):  
Hai Ping Qi ◽  
Jun Xi Wan ◽  
Hai Lin Cao ◽  
Yu Dong Huang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Vector Network Analyzer ◽  
Electromagnetic Properties ◽  
Network Analyzer ◽  
X Ray Diffraction ◽  
Electromagnetic Parameters ◽  
X Ray ◽  
Scanning Electron

Urchinlike Ni particles with different spines were synthesized. The microstructures and morphologies of the resulting materials were investigated by X-ray diffraction and scanning electron microscopy. And the electromagnetic parameters of these urchinlike Ni were measured with vector network analyzer at 2-18 GHz frequency. The results indicate that the electromagnetic parameters are affected by morphologies of materials. The long urchin spines will lead to larger permittivity.

Effect of the microwave thermal treatment condition on Pt–Fe/C alloy catalyst performance

2012 ◽  
Vol 37 (17) ◽  
pp. 12994-13000 ◽  
Author(s):  
Junsheng Zheng ◽  
Rong Fu ◽  
Tian Tian ◽  
Xizhao Wang ◽  
Jianxin Ma
Keyword(s):  
Thermal Treatment ◽  
Treatment Condition ◽  
Alloy Catalyst ◽  
Thermal Treatment Condition

Preparation and Electromagnetic Properties of Urchinlike Ni

2013 ◽  
Vol 803 ◽  
pp. 218-221
Author(s):  
Hai Ping Qi ◽  
Hai Lin Cao ◽  
Yu Dong Huang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Vector Network Analyzer ◽  
Electromagnetic Properties ◽  
Network Analyzer ◽  
X Ray Diffraction ◽  
Electromagnetic Parameters ◽  
X Ray ◽  
Microwave Absorbing Properties ◽  
Scanning Electron

Urchinlike Ni particles with different length and quantity spines were successful synthesized. The microstructures and morphologies of the resulting materials were investigated by X-ray diffraction and scanning electron microscopy. The amount of N2H4H2O plays an important role in the morphology of urchin. The electromagnetic parameters of these urchinlike Ni were measured with vector network analyzer at 2-18 GHz frequency. The results indicate that the microwave absorbing properties are improved by the urchin structure.

Reconfigurable SDM Optical Vector Network Analyzer

2014 ◽  
Author(s):  
Joel Carpenter ◽  
Benjamin J. Eggleton ◽  
Jochen Schröder
Keyword(s):  
Vector Network Analyzer ◽  
Network Analyzer

scholarly journals Wideband Active Load–Pull by Device Output Match Compensation Using a Vector Network Analyzer

2021 ◽  
Vol 69 (1) ◽  
pp. 874-886
Author(s):  
Alberto Maria Angelotti ◽  
Gian Piero Gibiino ◽  
Troels S. Nielsen ◽  
Dominique Schreurs ◽  
Alberto Santarelli
Keyword(s):  
Vector Network Analyzer ◽  
Network Analyzer ◽  
Active Load ◽  
Load Pull

scholarly journals Simulation and Experimental Study of the Near Field Probe in the Form of a Folded Dipole for Measuring Glucose Concentration

2021 ◽  
Vol 11 (12) ◽  
pp. 5415
Author(s):  
Aleksandr Gorst ◽  
Kseniya Zavyalova ◽  
Aleksandr Mironchev ◽  
Andrey Zapasnoy ◽  
Andrey Klokov
Keyword(s):  
Experimental Measurement ◽  
Glucose Concentration ◽  
Field Experiments ◽  
Near Field ◽  
Vector Network Analyzer ◽  
Human Hand ◽  
Physical Parameters ◽  
Network Analyzer ◽  
Frequency Range ◽  
Average Deviation

The article investigates the near-field probe of a special design to account for changes in glucose concentration. The probe is designed in such a way that it emits radiation in both directions from its plane. In this paper, it was proposed to modernize this design and consider the unidirectional emission of the probe in order to maximize the signal and reduce energy loss. We have done extensive research for both bidirectional and unidirectional probe designs. Numerical simulations and field experiments were carried out to determine different concentrations of glucose (0, 4, 5.3, 7.5 mmol/L). Numerical modeling of a unidirectional probe showed that the interaction of radiation generated by such a probe with a multilayer structure simulating a human hand showed a better result and high sensitivity compared to a bidirectional probe. Further, based on the simulation results, a phantom (physical model) of a human hand was recreated from layers with dielectric properties as close as possible to the properties of materials during simulation. The probe was constructed from a copper tube and matched both the geometric and physical parameters of the model. The experimental measurement was carried out using a vector network analyzer in the frequency range 2–10 GHz. The experimental measurement was carried out using a vector network analyzer in the frequency range 2–10 GHz for the unidirectional and bidirectional probes. Further, the results of the experiment were compared with the results of numerical simulation. According to the results of multiple experiments, it was found that the average deviation between the concentrations was 2 dB for a unidirectional probe and 0.4 dB for a bidirectional probe. Thus, the sensitivity of the unidirectional probe was 1.5 dB/(mmol/L) for the bidirectional one 0.3 dB/(mmol/L). Thus, the improved design of the near-field probe can be used to record glucose concentrations.

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