scholarly journals Metalens Antennas in Microwave, Terahertz and Optical Domain Applications

2021 ◽  
Author(s):  
Qi Song ◽  
Yan Gong ◽  
Nianxi Xu ◽  
Ruoqian Gao
Keyword(s):  
Electromagnetic Wave ◽  
Research And Development ◽  
Recent Progress ◽  
High Gain ◽  
Wave Radiation ◽  
Optical Frequency ◽  
Artificial Structure ◽  
Optical Domain ◽  
Innovative Techniques ◽  
Focused Beam

Metamaterial is the artificial structure under sub-wavelength dimension and could be designed to manipulate the electromagnetic wave radiation across the broad frequency range through microwave to much higher frequency, such as terahertz and optical regime. Lens antenna can generate the focused beam with high gain and shrink the bulky refractive body and feeds into a shape of flat form. This chapter will discuss the general concepts of metalens and the technology of metalens-based antenna at microwave, terahertz and optical frequency. The recent progress in the research and development of metalens antennas is reviewed with designs principle and typical applications. At last part, some innovative techniques such as dynamic focus-tuning of metalen are discussed in details.

scholarly journals Preparation and electromagnetic properties characterization of reduced graphene oxide/strontium hexaferrite nanocomposites

2020 ◽  
Vol 9 (1) ◽  
pp. 105-114 ◽  
Author(s):  
Shumin Du ◽  
Huaiyin Chen ◽  
Ruoyu Hong
Keyword(s):  
Electromagnetic Wave ◽  
Environmental Pollution ◽  
Electromagnetic Interference ◽  
Electromagnetic Waves ◽  
Rapid Development ◽  
Living Environment ◽  
World Health ◽  
Electromagnetic Properties ◽  
Strontium Hexaferrite ◽  
Wave Radiation

AbstractWith the rapid development of electronics and information technology, electronics and electrical equipment have been widely used in our daily lives. The living environment is full of electromagnetic waves of various frequencies and energy. Electromagnetic wave radiation has evolved into a new type of environmental pollution that has been listed by the WHO (World Health Organization) as the fourth largest source of environmental pollution after water, atmosphere, and noise. Studies have shown that when electromagnetic wave radiation is too much, it can cause neurological disorders. And electromagnetic interference will cause the abnormal operation of medical equipment, precision instruments and other equipment, and therefore cause incalculable consequences. Therefore, electromagnetic protection has become a hot issue of concern to the social and scientific circles.

A Review on R&D Status and Application of Fly Ash Cenospheres in Microwave Absorption

2013 ◽  
Vol 634-638 ◽  
pp. 1886-1889 ◽  
Author(s):  
Jing Zhang ◽  
Jiang Long Yu ◽  
Ping Yang Wang ◽  
Huan Zhao
Keyword(s):  
Surface Modification ◽  
Electromagnetic Wave ◽  
Fly Ash ◽  
Research And Development ◽  
Microwave Absorption ◽  
State Of The Art ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Art Research ◽  
Fly Ash Cenospheres

The paper provides an overview of surface modification and application of fly ash cenospheres. The state of the art research and development of electromagnetic wave absorption materials based on surface treated fly ash cenospheres are summarized.

Hydrometeorology

1978 ◽  
Vol 59 (5) ◽  
pp. 609-612 ◽  
Author(s):  
Eugene L. Peck
Keyword(s):  
Research And Development ◽  
Recent Progress ◽  
Additional Research

The paper presents a review of the activities of the Hydrology Committee of the AMS. In addition, recent progress and areas needing additional research and development in the field of hydrometeorology are discussed.

Recent Progress in Redox Flow Battery Research and Development

2012 ◽  
Vol 23 (8) ◽  
pp. 970-986 ◽  
Author(s):  
Wei Wang ◽  
Qingtao Luo ◽  
Bin Li ◽  
Xiaoliang Wei ◽  
Liyu Li ◽  
...  
Keyword(s):  
Research And Development ◽  
Recent Progress ◽  
Redox Flow Battery ◽  
Flow Battery
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