【摘要】 该文提出了一款通带独立可调的高选择性双频滤波天线。首先设计了一款微带耦合式馈电的双频带通滤波器,通过在微带馈线上引入一个金属通孔,实现源负载耦合,改善裙边选择性。同时,给出了滤波器对应的等效电路模型。在此基础上设计了一款椭圆形单极子天线,利用滤波天线综合设计方法与滤波器集成实现滤波天线。单极子天线带宽覆盖滤波器带宽,仅改变开口环电长度即可实现中心频率可调。为了验证设计加工和测试了相应天线。结果表明,天线工作在2.31 GHz与3.27 GHz时,相对带宽分别为10.3%和7.7%,增益分别为3.2 dBi和4.1 dBi,有4个辐射零点,中心频率可调范围为1.8～4.8 GHz。测量与仿真结果基本吻合。更多还原

【Abstract】 In this paper, a high selectivity, dual-band filtering antenna with independently tunable passband is proposed. Firstly, a dual-band filter with microstrip coupling feed is designed. The source-load coupling is implemented to improve the skirt selectivity by introducing a metallic hole in the microstrip. At the same time, the equivalent circuit model of the filter is given. On this basis, an elliptical monopole antenna is designed, and the filtering antenna is realized by using the comprehensive design method of filter antenna and filter integration. The bandwidth of the monopole antenna covers the filter bandwidth, and the center frequency can be adjusted only by changing the electric length of the open-loop. In order to verify the design, the corresponding antenna was fabricated and tested. The results show that the antenna has fractional bandwidth of 10.3% and 7.7%, gain of 3.2 dBi and 4.1 dBi respectively, four radiation nulls and tunable center frequency range from 1.8 GHz to 4.8 GHz when operating at 2.31 GHz and 3.27 GHz. The measured results agree well with the simulated ones.更多还原