【摘要】 提出了一种采用二维电磁带隙结构地板为反射器的微带八木天线。对所构造电磁带隙结构的电磁传输特性进行了研究,通过HFSS仿真和优化,使所设计天线的谐振频率落在电磁带隙地板阻带范围之内,有效地提高了天线的增益和阻抗带宽。实测结果表明,在2.3～2.75 GHz频率范围,所设计天线的回波损耗S11≤-10 dB,其阻抗相对带宽为18%,最大辐射方向增益达10.1 dBi,而相同结构但采用普通金属地板为反射器的对比天线,其阻抗相对带宽为12%,增益为8 dBi。研究结论对平面、高增益天线的设计具有很好的参考价值。更多还原

【Abstract】 A microstrip Yagi antenna that employs a 2-D EBG(Electromagnetic Band-gap) ground plane as the reflector is presented in this paper.The EBG structure has been designed and studied.With the aid of HFSS software,the antenna is designed and optimized so that its resonance frequency is within the band-gap frequency of the EBG ground plane,therefore the antenna gain is enhanced and the impedance bandwidth is extended effectively.Measurement results show that the S11 of the proposed antenna prototype is less than 10 dB over 2.3～2.75 GHz with a relative bandwidth of 18% and a peak gain of 10.1 dBi at bore-sight,while the contrast antenna using a normal metal ground plane as the reflector achieves a relative bandwidth of 12% and a peak gain of 8 dBi respectively.The research presented in this paper has a good reference value for the design of planar high gain antennas.更多还原