A Thin Planar Antenna Based on Gradient Metasurface
Gradient metasurface(GM)can have a pre-defined large wave vector along its surface.It has shining attributes as field enhancement and sub-wavelength transmission.In former works,GMs were excited mostly by plane waves illuminated from high above,and experts concentrated on waveform converting or anomalous reflection.This letter analyses electromagnetic field distribution above GM with some plane waves vertically illuminating.Then it provides a new way to excite GM on one of its edges using parallel plate waveguide,from which we can get an escaping plane wave towards above,and this is the inverse process of plane wave vertical incidence.After a delicate parameter sweep,the simulation shows our design has comparatively high directivity and efficiency within a bandwidth of 0.6 GHz(7.7 GHz to 8.3 GHz).The impact of some important size parameters to the antenna performance is discussed in the letter.On account of the fact that GMs are usually constructed by a mass of unit cells,their shapes are variable and they can cover many facilities,which have great potential in both civil and military use.With the development of metasurfaces,the unit cells will become smaller,and the adjustability of the antennae shapes will rise.To excite GMs with the same unit cells but different shapes,it is possible that we only need to tune their matching structure but not the unit cells.Then a new way to design reconfigurable antennae presents.And with the help of metasurfaces,reconfigurable antennae will be more various and flexible and will have better performance.
Bo Chen Hongyu Shi Anxue Zhang Juan Chen
School of Electronic and Information Engineering,Xian Jiaotong University,China
国际会议
Progress in Electromagnetics Research Symposium 2014(2014年电磁学研究新进展学术研讨会)
广州
英文
1383-1386
2014-08-01（万方平台首次上网日期，不代表论文的发表时间）