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提出了一种紧凑型共面波导馈电的具有三阻带特性的超宽带天线。所设计天线的基本几何结构由共面波导(CPW)馈电线、菱形辐射贴片和矩形宽缝隙组成。通过在辐射贴片上刻蚀一个U型槽,以及在共面波导的接地面上增加两对L型的寄生旁枝结构来实现天线的三陷波特性。天线尺寸为32mm×32mm×0.508mm。仿真和实验结果表明,该天线在2.6~11.5GHz的频段内电压驻波比小于2,在3.15~3.80GHz、5.20~5.80GHz和8.2~8.7GHz三个频段内具有陷波特性,分别有效阻隔了Wi MAX系统、WLAN系统和ITU 8GHz频段信号对于超宽带(UWB)系统的干扰。在除三个阻带频段外的其余UWB工作频段范围内,具有良好的辐射方向特性和稳定的增益。仿真结果和实验结果表现出良好的一致性。
A compact broadband coplanar waveguide (UWB) antenna with three stopband characteristics is proposed. The basic geometry of the designed antenna consists of coplanar waveguide (CPW) feed lines, diamond-shaped radiating patches and rectangular wide slits. The three-notched characteristic of the antenna is achieved by etching a U-shaped groove in the radiating patch and adding two pairs of L-shaped parasitic dendrites on the ground plane of the coplanar waveguide. The antenna size is 32mm × 32mm × 0.508mm. Simulation and experimental results show that the VSWR of the antenna in the frequency band of 2.6 ~ 11.5GHz is less than 2, and has notch characteristics in 3.15 ~ 3.80GHz, 5.20 ~ 5.80GHz and 8.2 ~ 8.7GHz bands, respectively, which are effective Blocks the interference of Wi MAX systems, WLAN systems and ITU 8 GHz signals to ultra-wideband (UWB) systems. With the exception of the three stop-band frequencies, the rest of the UWB operating band has good radiation pattern characteristics and stable gain. The simulation results and experimental results show good consistency.