【摘要】 为克服无线通信系统间相互干扰,采用频带抑制技术对共面波导馈电圆形单极子天线进行改进,设计出一副具有双阻带特性的超宽带天线和一副用于无线局域网/全球微波接入(WLAN/WiMAX)系统的三频段天线.通过在圆形贴片底端加载两条多边形槽线,实现了3.29～4.00 GHz和5.29～6.00 GHz抑制频段的超宽带天线,阻带覆盖了WLAN/WiMAX应用频段.在三频段天线的设计中,综合采用五边形槽线、调谐枝节和扇形槽加载技术,对频带进行阻断和控制.实测三频段天线的工作频带为2.25～2.80 GHz、3.3～3.8 GHz和5.1～5.9 GHz,覆盖了WLAN/WiMAX系统的应用频段,并在其余频段具有良好的频带抑制特性.所设计的两幅天线均具有可调的工作频段,适合复杂环境中对无线通信系统相互干扰的抑制.更多还原

【Abstract】 The Coplanar Waveguide(CPW) fed circular monopole antenna is improved to suppress the interference among different wireless systems.An ultra wideband(UWB) antenna with dual band notched characteristics and a tri-band antenna for WLAN/WiMAX applications are,respectively,proposed in this paper.The UWB antenna with the measured band rejection of 3.29～4GHz and 5.29～6GHz is designed by loading two pieces of polygonal slotline at the bottom of the circular patch.Its notched frequency bands cover WLAN and WiMAX systems.In the design of the tri-band antenna,the frequency band of the antenna is controlled and notched by loading the elements of slotline,resonant stub and radial slot on the antenna.This tri-band antenna renders the measured frequency bands of 2.25～2.8GHz,3.3～3.8GHz and 5.1～5.9GHz,which cover the application bands of WLAN/WiMAX,and has good band rejected characteristics in the remaining frequency band.Both the proposed antennas are of adjustable frequency band,and are suitable for suppressing the interference among wireless systems in the complex circumstance.更多还原