scholarly journals High-efficiency ultra-wideband polarization conversion metasurfaces based on split elliptical ring resonators

2015 ◽  
Vol 64 (17) ◽  
pp. 178101
Author(s):  
Yu Ji-Bao ◽  
Ma Hua ◽  
Wang Jia-Fu ◽  
Feng Ming-De ◽  
Li Yong-Feng ◽  
...  
Keyword(s):  
High Efficiency ◽  
Ultra Wideband ◽  
Ring Resonators ◽  
Polarization Conversion ◽  
Elliptical Ring

scholarly journals High-efficiency cross-polarization conversion metamaterial using spiral split-ring resonators

AIP Advances ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 095210 ◽  
Author(s):  
Tian Yang ◽  
Xiaoming Liu ◽  
Chen Wang ◽  
Feilou Wang ◽  
Ji Zhou
Keyword(s):  
High Efficiency ◽  
Ring Resonators ◽  
Polarization Conversion ◽  
Cross Polarization ◽  
Split Ring ◽  
Split Ring Resonators

Reflective and transmissive cross-polarization converter for terahertz wave in a switchable metamaterial

2021 ◽  
Author(s):  
Yuanyuan Jiang ◽  
Man Zhang ◽  
Weihua Wang ◽  
Zhengyong Song
Keyword(s):  
Vanadium Dioxide ◽  
High Efficiency ◽  
Incident Angle ◽  
Terahertz Wave ◽  
Polarization Conversion ◽  
Cross Polarization ◽  
Polarization Converter ◽  
Metallic Grating ◽  
Vanadium Dioxide Film ◽  
Wave Conversion

Abstract Utilizing the phase transition characteristic of vanadium dioxide, we present a metamaterial configuration to achieve both reflective and transmissive cross-polarization converters. When vanadium dioxide is metal, the design behaves as a reflective cross-polarization converter. It consists of metallic grating, topas spacer, and vanadium dioxide film. Polarization conversion ratio is more than 90% in the frequency range from 4.80 THz to 13.13 THz. When vanadium dioxide is insulator, the design behaves as a transmissive cross-polarization converter using cascaded metallic gratings with rotation angle . High-efficiency broadband cross-polarization wave conversion is achieved in the frequency band of 0.50-4.75 THz. The effects of oblique incidence on reflective and transmissive modes are studied on polarization conversion. The results tell that cross-polarization conversion is better when incident angle is in the range of -. The designed metamaterial may have a certain inspiration for the research of terahertz multifunctional polarization converter.

scholarly journals Compact Wearable Meta Materials Antennas for Energy Harvesting Systems, Medical and IOT Systems

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1340 ◽  
Author(s):  
Albert Sabban
Keyword(s):  
Energy Harvesting ◽  
High Efficiency ◽  
Dynamic Range ◽  
Green Energy ◽  
Ring Resonators ◽  
Green Technologies ◽  
Continuous Growth ◽  
Harvesting Systems ◽  
Low Efficiency ◽  
Line Design

Demand for green technologies and green energy is in continuous growth in the last decade. Compact efficient radiators are very important for energy harvesting portable systems. Small antennas have low efficiency. The efficiency of communication and energy harvesting systems may increase by using efficient passive and active antennas. The system dynamic range may be improved by connecting amplifiers to the printed antenna feed line. Design, design considerations, computed and measured results of wearable meta-materials antennas with high efficiency for energy harvesting applications are presented in this paper. The antennas electrical parameters on human body were analyzed by using commercial full-wave software. The wearable antennas are compact and flexible and are 1.6 mm thick. The directivity and gain of the antennas with Split-ring resonators (SRR), is higher by 2 dB to 3 dB than the antennas without SRR. The resonant frequency of the antennas without SRR is higher by 5% to 10% than the antennas with SRR.

High-efficiency antenna-to-antenna polarization converters for customized polarization angle deflection

2020 ◽  
Vol 12 (7) ◽  
pp. 688-694
Author(s):  
Manlan Deng
Keyword(s):  
High Efficiency ◽  
Design Method ◽  
Ring Resonators ◽  
Polarization Angle ◽  
Dipole Antennas ◽  
Transmitted Waves ◽  
Angle Rotation ◽  
Transmitting Antenna ◽  
Antenna Polarization ◽  
Polarization Converters

AbstractIn this paper, an antenna-to-antenna method to design high-efficiency polarization converters was proposed. Two in-linked split ring resonators (SRRs) were used as the fundamental unit cell, which can effectively make the original linear polarization angle deflected into a customized one (include but not limited to 90°). The same as the process of energy reception and transmitting of microstrip symmetric dipole antennas, the top SRR plays the role of a receiving antenna and the bottom one acts as a transmitting antenna. Under normal illumination, the strong coupling between electric resonance and magnetic resonance can result in high transmission and broad bandwidth. Since the two SRRs act as two independently polarization selective components, the polarization angle of transmitted waves can be easily controlled by rotating the transmitting SRRs around the center. The proposed concept and the design method are validated using numerical simulations, as well as experimental results of three examples for 45, 60 and 90° polarization angle rotation, the polarization conversion ratio of which is about 92.2, 88.9 and 91.9% from 7.5 to 10 GHz.

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