Design of slot antenna with bandwidth and gain improved based on nonuniform metasurface
In order to solve the problem of insufficient bandwidth and gain performance of patch antenna,this paper presents a kind of antenna with bandwidth and gain improved which is realized by a nonuniform meta-sur-face.Firstly,slit patches with cut corners are used as the initial antenna.Then,to further enhance the radiation properties,square corner-cut patches are arranged around the initial antenna to form a nonuniform meta-surface.The simulation results are shown as follows:compared with the initial antenna,two additional resonant frequen-cies are generated,resulting in a reflectance S11 bandwidth range of 4.4-6.6 GHz.Moreover,the axial ratio breaks through the 3 dB line;the 3 dB axial ratio bandwidth ranges from 4.7 GHz to 5.7 GHz;the gain is increased by an average of 3 dB,and the peak gain reaches 11.3 dBic.In addition,the radiation pattern at 5.05 GHz shows a low cross polarization of less than 25 dB.
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