一款小型化具有滤波特性的Г型天线设计

Design of Small Г-type Antenna with Filtering Characteristic

目的设计一款适用于现代无线通信系统的小型化、具有滤波特性的Г型天线。方法采用类似滤波器综合的方法设计这款滤波器天线,由二个发夹型谐振器、一段耦合线和一个Г型天线组成,其中耦合线不仅起着连接天线与发夹性谐振器的作用,还起着导纳变换器的作用。因此Г型天线在起辐射作用的同时也是滤波器的一个谐振器。结果采用这种设计不仅减小了滤波器与天线集成设计的尺寸,也使两者的信号传输损耗更小。结论该滤波器天线在反射系数<-10 d B的阻抗带宽有6.5%(2.38~2.54 GHz),通带外增益快速下降,在2.15 GHz和2.75 GHz处增益分别为-15 d Bi和-25 d Bi。

Objective To design a smallГ-type antenna with filtering and miniaturization characteristics for modern wireless communication system.Methods This antenna with filtering characteristic was designed of two hairpin resonators,a coupling line and aГ-type antenna through a method which is similar to filter synthesis.The coupling line not only played a role of connecting antenna with hairpin resonator,but also a admittance converter.So thisГ-type antenna was a resonator of the filter as well as the radiation.Results This design not only reduced the size of the integrated design of the filter and the antenna,but also made the signal transmission loss smaller.Conclusion The impedance bandwidth of the filter antenna is 6.5%(2.38-2.54 GHz)with the reflection coefficient S11<-10 dB.Outside the pass band,the gain decline rapidly.The gain at 2.15 GHz and 2.75 GHz gain is 15 dBi and-25 dBi respectively.