scholarly journals Preparation of MWCNT/Ba0.2Sr0.2La0.6MnO3/PANI nanocomposites and investigation of its electromagnetic properties in KU-band

2020 ◽  
Vol 15 (4) ◽  
pp. 171-181 ◽  
Author(s):  
H. Hosseini S. ◽  
Paymanfar R. ◽  
Afshari T. ◽  
S. Hosseini S.
Keyword(s):  
Electromagnetic Properties ◽  
Ku Band

scholarly journals Electromagnetic properties of polymer composites Co52Cr22Ni10W7,5Fe1,5 i Fe59Cr21,5Ni7Si1Mn10 at Ku band

2017 ◽  
Vol 45 (4) ◽  
pp. 678-683 ◽  
Author(s):  
Chrif Elboubakraoui ◽  
Seddik Bri ◽  
Jaouad Foshi
Keyword(s):  
Polymer Composites ◽  
Electromagnetic Properties ◽  
Ku Band

scholarly journals Symmetric square shaped metamaterial structure with quintuple resonance frequencies for S, C, X and Ku band applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tayaallen Ramachandran ◽  
Mohammad Rashed Iqbal Faruque ◽  
Mohammad Tariqul Islam
Keyword(s):  
Numerical Simulation ◽  
Research Work ◽  
Microwave Frequency ◽  
Substrate Material ◽  
Electromagnetic Properties ◽  
High Frequency Structure Simulator ◽  
Design Structure ◽  
Resonance Frequencies ◽  
Compact Design ◽  
Ku Band

AbstractThis study explores the effect of symmetrical square shaped metamaterial design for microwave frequency applications. The latest technology demands of advanced performance and research studies of metamaterial integration in the related bands are increasing tremendously. Therefore, this motivates us to explore the metamaterial design structure that has a high possibility to be applied in more than two resonance bands using a compact design structure. This study emphasis on a compact 14 × 14 mm2 and 1.524 mm thick substrate material known as Rogers RT6002. Seven distinct square shaped metamaterial (SQM) rings were constructed on the substrate material to achieve the goal of this research study. Besides that, the investigations of the metamaterial electromagnetic properties and effective medium parameters were carried out by utilising the Computer Simulation Technology Microwave Studio (CST) software. According to the numerical simulation results, the proposed SQM unit cell manifested quintuple resonance frequencies precisely at 3.384 (S band), 5.436, 7.002 (C band), 11.664 (X band), and 17.838 GHz (Ku band). Meanwhile, for the validation process, the comparison between the simulation and measurement results was analysed and data showed that the first and third resonance frequencies were increased by 0.336 and 0.139 GHz, respectively while other frequencies were reduced by 0.186, 0.081, and 0.709 GHz in sequential order. The numerical simulation of the metamaterial design was conducted in a High Frequency Structure Simulator (HFSS) to further validate the results. Furthermore, the proposed SQM manifested left handed characteristics at the second to fifth resonance bands. In a nutshell, the SQM successfully achieves the objectives of this research work and can be applied to multi band applications.

Facet Topography and Dislocation Structure as a Possible Source for Electrical Heterogeneity in [001] TILT Bicrystals of YBa2Cu3O7-δ

1996 ◽  
Vol 54 ◽  
pp. 338-339
Author(s):  
I-Fei Tsu ◽  
D.L. Kaiser ◽  
S.E. Babcock
Keyword(s):  
Grain Boundary ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Electromagnetic Properties ◽  
Length Scale ◽  
Density Values ◽  
Current Densities ◽  
Applied Fields ◽  
A Current

A current theme in the study of the critical current density behavior of YBa2Cu3O7-δ (YBCO) grain boundaries is that their electromagnetic properties are heterogeneous on various length scales ranging from 10s of microns to ˜ 1 Å. Recently, combined electromagnetic and TEM studies on four flux-grown bicrystals have demonstrated a direct correlation between the length scale of the boundaries’ saw-tooth facet configurations and the apparent length scale of the electrical heterogeneity. In that work, enhanced critical current densities are observed at applied fields where the facet period is commensurate with the spacing of the Abrikosov flux vortices which must be pinned if higher critical current density values are recorded. To understand the microstructural origin of the flux pinning, the grain boundary topography and grain boundary dislocation (GBD) network structure of [001] tilt YBCO bicrystals were studied by TEM and HRTEM.

A Ku-band multibeam active phased array for satellite communications

1992 ◽  
Author(s):  
R. SORBELLO ◽  
A. ZAGHLOUL ◽  
R. GUPTA ◽  
B. GELLER ◽  
F.T. ASSAL
Keyword(s):  
Phased Array ◽  
Satellite Communications ◽  
Ku Band
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