|
|
|
| Study on Characteristics of Converging-Wave Based on Low Effective Permittivity Metamaterials |
| Liu Tao; Cao Xiang-yu; Ma Jia-jun; Wang Wei |
| Institute of Telecommunication Engineering, Engineering University of Air Force, Xi’an 710077, China |
|
|
|
|
Abstract Through establishing structure model, the relation is presented among radiation power density of radiation source and effective permittivity and effective permeability. Simultaneously, the relations are numerically analyzed between radiation power density and permittivity, thickness, location of radiation source and operation frequency. The results show that radiation power density is directly proportional to the ratio of effective permittivity and effective permeability; relative low permittivity may remarkably improve radiation power density of radiation source; the maximum of radiation power density is the periodic function of thickness, and is less relation with the location of radiation source; the operation frequency band is very narrow in which the radiation power density can obtain larger values. The results may explain the reason theoretically that low permittivity metamaterials as a cover can enhance the gain of antenna.
|
|
Received: 28 November 2007
|
|
|
|
|
|
|
|
|
2009, Vol. 31 
