摘要
An improved compact ultra-wideband(UWB)microstrip antenna with metamaterials is proposed.The total size is slightly reduced and the measured impedance bandwidth operates from 3.84 to 22.77 GHz for a return loss of less than-10 dB.Compared with the original patch antenna,the bandwidth of this antenna is about six times broader.Moreover,the antenna has an average gain of 6.2 dB,which is 1.2 dB larger than the original one.Both strong radiation in the horizontal direction and practical characteristics are observed.Thus,this antenna would have some specific applications for UWB wireless communications in the future.
基金
Supported by the National Natural Science Foundation of China under Grant Nos 61172115,60872029
the High-Tech Research and Development Program of China(No 2008AA01Z206)
the Aeronautics Foundation of China(No 20100180003).
