一款用于无线通信系统的小型滤波器天线

目的设计一款适用于现代无线通信系统小型的滤波器天线。方法由一微带开口环谐振器、一段耦合线和一个Г型天线组成一款滤波器天线。这个Г型天线由耦合线激励,在设计中起着导纳变换器的作用。Г型天线不仅起着辐射的作用,同时也是滤波器最后一个谐振器,使滤波器和天线之间基本没有损耗,在仿真调试后,加工成实物进行测试。结果该滤波器天线在反射系数S11<-10 dB的阻抗带宽有12.7%(2.36~2.68 GHz),滤波器天线具有平坦的通带,通带内的最大差异为0.84 dB。滤波器天线通带外增益不到-15 dBi,这说明滤波器天线具有很好的带外抑制性。结论设计的滤波器天线通带内天线增益较为平坦,且拥有良好的带外抑制特性、滤波与辐射特性,并且损耗很低,很适合用于现代无线通信系统的射频前端。

A Compact Filter Antenna for Wireless Communication System

The work aims to design a compact filter antenna for modern wireless communication systems.The filter antenna consisted of a microstrip open-loop resonator,a coupling line and aΓ-shaped antenna.TheΓ-shaped antenna was excited by coupling line.Meanwhile,the coupling line was used as an admittance converter in filter design.TheΓ-shaped antenna not only played the role of radiation,but also was the last resonator of the filter.The advantage of this design was that there was basically no loss between the filter and the antenna.After the simulation debugging,the filter antenna was processed into a physical object for testing.The impedance bandwidth of the proposed filter antenna was 12.7%(2.36~2.68 GHz)when the reflection coefficient S11<-10 dB.The filter antenna had flat passband and the maximum difference inside the passband was 0.84 dB.The out-of-band gain of filter antenna was less than-15 dBi,which indicated that the filter antenna had good out-of-band rejection.With flat antenna gain inside the passband,the designed filter antenna featured by good out-of-band rejection characteristics,filtering and radiation characteristics and very low loss is suitable for the RF front end of the modern wireless communication system.