设计了一种新型的分形微带天线,提出了一种扩展天线带宽的方法,此方法可将天线带宽提高将近6倍,相对阻抗带宽从4.9%提高到30%左右.然后根据天线频率可重构形成的基本原理,在此宽带天线基础上引入了三个MEMS开关,通过改变开关的状态,切换调整分形微带天线组合结构,使天线能工作在三个频段,扩展了天线工作带宽.以此超宽带分形天线为阵元组成新型的分形阵列,并对其阵元之间的耦合做了初步测试分析.%A new fractal microstrip antenna is designed. One method which can widen antenna's bandwidth for 6 times is presented and validated through HFSS emulation. Thereafter,based on the theory of frequency-reconfigurable antenna and broadband antenna structure,three MEMS switches are introduced. By changing the states of the switches, the antenna can work in three frequency bands, extending the bandwidth of the antenna indirectly. A new fractal antenna array is designed based on these units, and also the mutual coupling among units of antenna array is preliminary analyzed.
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