超宽带实用型介质谐振器天线研究与设计

Research and design of practical UWB DRA

现代无线通信技术为了减少系统复杂性,对单一天线带宽的性能要求越来越高,故设计一种具有实用性的超宽带介质谐振器天线(DRA)。该天线采用微带线缝隙耦合馈电方式,通过微带线给接地板上的矩形槽和"U"型槽馈电,然后通过槽将电流输入到介质谐振器中。为了防止电磁波的散射,在介质谐振器背面附上寄生贴片,上部加入反射板,可以将天线的性能大幅度提高。该天线分别谐振在5.25 GHz和6.3 GHz,工作在4.6~6.8 GHz,其中5.1~5.9 GHz是WLAN波段,其阻抗带宽达到了39%,因此具有很好的实用价值。该天线的仿真结果由电磁仿真软件得到,通过Agilent Technology PNA N5245A矢量网络分析仪测量天线的回波损耗及增益,得到的测量结果和仿真结果吻合。

In order to reduce the system complexity,the modern wireless communication technology has high requirement for the performance of the single antenna bandwidth,therefore a practical UWB dielectric resonator antenna（DRA） was researched and designed. The microstrip line slot coupled feeding mode is adopted for the antenna. The feeding was performed for the rectangular slot and U-shaped slot in the earthing plate through the antenna. The current is input into the dielectric resonator through the slots. In order to prevent the scattering of electromagnetic wave,the parasitic patch is attached on the back of the dielectric resonator. The reflection plate is added on the top of the dielectric resonator to improve the performance of the antenna greatly. The antenna is resonated at 5.25 GHz and 6.3 GHz respectively,works at 4.6-6.8 GHz（5.1~5.9 GHz is the WLAN band）,its impedance bandwidth can reach up to 39%,and has perfect practical value. The simulation results of the antenna were obtained by means of the electromagnetic simulation software. The Agilent Technology PNA N5245 A vector network analysis meter is used to measure the return loss and gain of the antenna. The obtained measured results are close to the simulation results.