加载寄生单元的双频宽带天线设计与研究

Design and Research of Dual-band Broadband Antenna Loaded with Parasitic Elements

为展宽微带天线的带宽,设计一种加载寄生单元的双频微带天线,适用于3.5 GHz和5.8 GHz的WLAN/WIMAX通信和RFID技术的应用。所设计天线通过在主辐射贴片开T形槽、在接地板条带处开矩形槽和加载寄生单元的方式来实现双频段和扩展整体工作带宽,同时也提高了天线设计的灵活性。在馈电上采用偏心嵌套馈电,可以方便调节天线的阻抗匹配特性。该天线工作频段分别为3.40~3.70 GHz和5.49~6.18 GHz,相对带宽分别为8.57%和11.90%,且仿真和实测结果较为吻合,与传统天线相比,具有双频宽带的优势。

In order to broaden the bandwidth of the microstrip antenna,this paper designs a dual-frequency microstrip antenna loaded with parasitic elements,which is suitable for 3.5GHz and 5.8GHz WLAN/WIMAX communication and RFID technology applications.The designed antenna realizes dual frequency bands and expands the overall working bandwidth by opening a T-shaped slot in the main radiating patch,opening a rectangular slot in the grounding strip and loading parasitic elements,and also improves the flexibility of antenna design.The eccentric nested feed is adopted for the feed,which can easily adjust the impedance matching characteristics of the antenna.The antenna working frequency bands are 3.40~3.70GHz and 5.49~6.18GHz,and the relative bandwidths are 8.57%and 11.90%respectively.The simulation and measured results are more consistent.Compared with the traditional antenna,it has the advantage of dual-band broadband.