An improved compact ultra-wideband (UWB) patch antenna with metamaterials is proposed. The total size is reduced and the simulated impedance bandwidth operates from 3.8 to 19.4 GHz for S-parameter of less than -10 dB level. The bandwidth of this antenna is 15.6GHz. 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.
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