一种具有三阻带特性的超宽带天线的设计与研究*

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。

Design and Research of a Compact CPW-fed UWB Antennawith Triple Band-notched Characteristic

A compact CPW-fed planar UWB antenna with triple band-notched property is presented. The proposed antenna is CPW-fed with a diamond patch and a rectangle wide slot. The triple band rejection is achieved by etching a U-shaped slot on the radiation patch and adding two pairs of L-shapes parasitic strips onto the rectangle slot. The fabricated antenna has a tiny size, only 32mm ×32mm ×0.508mm. The experimental and measured results show that the proposed antenna exhibits an impedance bandwidth over an ultra-wideband frequency range from 2.6 to 11.5GHz with VSWR less than2, except three stopbands at 3.15 ~ 3.80 GHz, 5.20 ~ 5.80 GHz and 8.2~ 8.7GHz for filtering the WiMAX, WLAN and ITU 8GHz band signals respectively. It also demonstrates a nearly omnidirectional radiation pattern and a stable gain. The simulated results are compared with the measured performance, and show good agreements.