scholarly journals Influence of left-handed material on the resonant frequency of resonant cavity

2015 ◽  
Vol 64 (12) ◽  
pp. 124103
Author(s):  
Li Pei ◽  
Wang Fu-Zhong ◽  
Zhang Li-Zhu ◽  
Zhang Guang-Lu
Keyword(s):  
Resonant Frequency ◽  
Resonant Cavity ◽  
Left Handed

Resonant frequency analysis of reentrant resonant cavity applicator by using FEM and FD-TD method

2000 ◽  
Vol 36 (4) ◽  
pp. 1750-1753 ◽  
Author(s):  
T. Kashiwa ◽  
M. Miyakawa ◽  
T. Tsukamoto ◽  
Y. Kanai
Keyword(s):  
Resonant Frequency ◽  
Frequency Analysis ◽  
Resonant Cavity

scholarly journals Study of Antenna Superstrates Using Metamaterials for Directivity Enhancement Based on Fabry-Perot Resonant Cavity

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Haixia Liu ◽  
Shuo Lei ◽  
Xiaowei Shi ◽  
Long Li
Keyword(s):  
Reflection Coefficient ◽  
Resonant Cavity ◽  
Frequency Selective Surface ◽  
Lens Model ◽  
Optimum Location ◽  
Electromagnetic Bandgap ◽  
Left Handed ◽  
Antenna Directivity ◽  
Fabry Perot ◽  
Refractive Lens

Metamaterial superstrate is a significant method to obtain high directivity of one or a few antennas. In this paper, the characteristics of directivity enhancement using different metamaterial structures as antenna superstrates, such as electromagnetic bandgap (EBG) structures, frequency selective surface (FSS), and left-handed material (LHM), are unifiedly studied by applying the theory of Fabry-Perot (F-P) resonant cavity. Focusing on the analysis of reflection phase and magnitude of superstrates in presently proposed designs, the essential reason for high-directivity antenna with different superstrates can be revealed in terms of the F-P resonant theory. Furthermore, a new design of the optimum reflection coefficient of superstrates for the maximum antenna directivity is proposed and validated. The optimum location of the LHM superstrate which is based on a refractive lens model can be determined by the F-P resonant distance.

Influence of Large Water Droplets Passing through Microwave Cavity on Steam Wetness Measurement

2013 ◽  
Vol 339 ◽  
pp. 495-502
Author(s):  
Jiang Bo Qian ◽  
Heng Fan Li ◽  
Zhong He Han
Keyword(s):  
Resonant Frequency ◽  
Quality Factor ◽  
Resonant Cavity ◽  
Great Influence ◽  
Microwave Cavity ◽  
Large Droplet ◽  
Ring Radius ◽  
Secondary Droplets ◽  
Large Water ◽  
Turbine Exhaust

The steam turbine exhaust contains large secondary droplets, and the droplets show an uneven distribution in space and time. It analyzes the change of resonant frequency and quality factor with different sizes and positions of droplets, and analyzes the influence on the steam wetness measurement. The results show that: when the size of resonant cavity is constant, the resonant frequency and quality factor are related to the size and location of water droplet. For the cylindrical cavity whose length is 40mm and radius is 30mm, when large droplet located in the ring (radius is 13.0mm) onxoyplane, it has great influence on wetness measurement, and the influence is greater with larger size of droplet.

scholarly journals The relationship between resonant frequency band and cell size in left-handed materials

2009 ◽  
Vol 58 (6) ◽  
pp. 3844
Author(s):  
Wu Jun-Fang ◽  
Sun Ming-Zhao ◽  
Zhang Chun-Min
Keyword(s):  
Resonant Frequency ◽  
Cell Size ◽  
Frequency Band ◽  
Left Handed ◽  
The Relationship

Shift Resonant Frequency by Changing Space Between Layers in Left-handed Materials*

2010 ◽  
Vol 39 (7) ◽  
pp. 1181-1185
Author(s):  
吴俊芳 WU Jun-fang ◽  
刘汉臣 LIU Han-chen
Keyword(s):  
Resonant Frequency ◽  
Left Handed
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