Design of a freeform refractive surface with reflection loss for illumination

2021 ◽  
Author(s):  
Weitao Song ◽  
Chen Xu ◽  
Yue Liu ◽  
Yongtian Wang
Keyword(s):  
Reflection Loss

scholarly journals Printed dipole antenna and its arrays for wireless applications

2018 ◽  
Vol 7 (2.7) ◽  
pp. 952
Author(s):  
V Teju ◽  
P V. P. S Nikhil ◽  
A Pranusha ◽  
Ch Divya ◽  
G Bhanuprakash
Keyword(s):  
Reflection Loss ◽  
Mutual Coupling ◽  
Dipole Antenna ◽  
Wide Frequency Range ◽  
Single Element ◽  
Frequency Range ◽  
Scanning Angle ◽  
Wireless Applications ◽  
Element Array

This paper proposes single element of micro-stripe antenna having wider bandwidth and also its arrays which are implemented for wire-less applications. In contemplation of wide frequency range of operation, antenna is fed with integrated balun. The single element antenna works under frequency range of 34GHz to 46GHz where reflection loss is less than -10dB and the obtained gain is 2.1 dBi. The linear 8-element array of antenna has been implemented and to obtain low mutual coupling between the elements of antenna a rectangular stub has been implemented. By enforcing the array methodology the not only the overall gain of the antenna has increased but also results in wider scanning angle.  

Magnetization and Microwave Absorption Properties of La0.67 Sr0.33 MnO3 with Different Particle Size

2011 ◽  
Vol 374-377 ◽  
pp. 1541-1544 ◽  
Author(s):  
Yu Lan Cheng ◽  
Ping Xia ◽  
Ke Xiang Wei ◽  
Quan Bai
Keyword(s):  
Particle Size ◽  
Sinter Temperature ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Sol Gel ◽  
Frequency Range ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Measured Frequency Range ◽  
Maximum Reflection Loss

La 0.67 Sr 0.33 MnO 3 particles with different particle size have been prepared by sol-gel method. The structure, magnetization and microwave absorption properties have been investigated. The results show that the particle size can be controlled by sinter temperature. The peaks of the maximum reflection loss (RL) move to higher frequency regions with increasing particle size. The value of the maximum RL is -32 dB at 10.2GHz with a particle size of 58.5nm. The bandwidth with a RL exceeding -8dB reached 1.6GHz in the whole measured frequency range, suggesting that La 0.67 Sr 0.33 MnO 3 particles are promising for application as a wideband and strong absorption building microwave absorber.

MICROWAVE ABSORBING PROPERTIES OF CO/REDUCED GRAPHENE OXIDE IN KU-BAND

2013 ◽  
Vol 06 (04) ◽  
pp. 1350042 ◽  
Author(s):  
SHUAI LIN ◽  
JINGHUA YU ◽  
FANGHUI WANG ◽  
YONGSHENG WEI ◽  
BAOGUO YUAN ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Reflection Loss ◽  
Wide Frequency Range ◽  
Maximum Absorption ◽  
Frequency Range ◽  
Chemical Plating ◽  
Oxidation Reduction ◽  
Reduced Graphene ◽  
Plating Method

Reduced graphene oxide (RGO) was prepared by the oxidation-reduction method. Cobalt nanoparticles were coated on the surfaces of the graphene sheets by using a chemical plating method. The complex relative permittivity and permeability in the frequency range of 2–18 GHz were measured by using a vector network analyzer. The reflection loss curves of the materials were calculated using computer simulation. The simulated results showed that the reflection loss of Co /RGO was stronger than that of RGO. The maximum absorption peaks shifted to lower frequency region as the thickness increased. The reflection loss greater than -10 dB over a wide frequency range 12.5–17.5 GHz and the maximum absorption peak was -12.5 dB at 15.5 GHz at a thickness of 2 mm.

Controllable synthesis of uniform ZnO nanorods and their enhanced dielectric and absorption properties

2014 ◽  
Vol 2 (23) ◽  
pp. 8644-8651 ◽  
Author(s):  
Guang-Sheng Wang ◽  
Ying-Ying Wu ◽  
Xiao-Juan Zhang ◽  
Yong Li ◽  
Lin Guo ◽  
...  
Keyword(s):  
Percolation Threshold ◽  
Reflection Loss ◽  
Filler Content ◽  
Zno Nanorods ◽  
Dielectric Behavior ◽  
Hot Press ◽  
Controllable Synthesis ◽  
Absorption Properties ◽  
Press Method ◽  
Two Peaks

The PVDF/ZnO composites were prepared by a simple hot-press method. The dielectric behavior of the composites was improved at a lower percolation threshold. For the composites with a filler content of 10 wt%, the reflection loss appears as two peaks that can reach −15.90 dB at 6.60 GHz and −25.44 dB at 16.48 GHz.

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