In this paper, a frequency selective surface (FSS) cell is proposed. The band stop frequency performance is compared between the two and four layer FSS structure with the proposed cells. The four layers structure has the same low frequency as the two layers structure, but the four layers structure has 3.6 GHz wider stop band in high frequency. Then a reflector with the proposed EBG cells for ultra wideband antenna is developed. Compared the performance for the reference antenna with and without the proposed reflector, the average improvement of the front-to-back ratio of the UWB antenna with designed FSS reflector is 15 dB from 3.1 GHz to 10.6 GHz and the peak even can get to 30 dB at 5 GHz.%本文提出了一种新型的频率选择表面结构。首先研究了其等效电路，并比较了相同结构，两层和四层频率选择表面的带阻性能，可以看出四层结构和两层结构在低频性能相同，但四层结构在高频时带宽增大了3.6 GHz。其次将这种频率选择表面用做超宽带天线的反射板，能够在超宽带频率3.1 GHz 到10.6 GHz 频率范围内平均增大天线的前后比15 dB，在5 GHz 甚至能够提高30 dB。
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