具有曲折对称臂结构的三频单极子天线设计*

设计了一款可以工作与WLAN/WiMAX领域的、具有对称臂的三频单极子天线。天线由两个对称的折叠臂和不规则的接地板组成;其中,两个对称的折叠臂分别产生了2.4 GHz,3.5 GHz和5.8 GHz频段。使用不规则接地板可改善天线的阻抗匹配,天线通过SMA接头采用50欧的微带线进行馈电。天线在2.4 GHz处的带宽为7.5%(2.3~2.48 GHz),在3.5 GHz处的带宽为5%(3.41~3.58 GHz),在5.5 GHz处的带宽为6.5%(5.54~5.9 GHz),且天线在各个频段处有良好的全向辐射特性。最后,在仿真的基础上加工制作出实物并进行了测试,测试结果和仿真结果大致吻合,可以用到实际的无线通信中。

A Printed Triple-Band Monopole Antenna with Symmetric Meandered Arms

In this paper, a planar triple band symmetric meandered arms monopole antenna for wireless local area network (WLAN) WiMAX applications is presented. The antenna consists of two symmetric Meandered arms radiating strip leading to generate three separate resonant modes where the first mode is for the 2.4 GHz band and the second mode is for the 3.5 GHz band operation and third mode is for the 5.8GHz band. Adopting irregular rectangular with the circular-slot improves the antenna impedance bandwidth simultaneously. This purposed antenna is fed by a coaxial probe through a SMA connector. The triple-band antenna achieves a bandwidth of ~7.5% (2.3-2.48 GHz) for the 2.4GHz frequency band and ~5% (3.41-3.58 GHz) for the 3.5GHz frequency band and ~6.5% (5.54-5.9GHz) for the 5.8GHz frequency band, and owns good radiation characteristics impedance bandwidths. Finally,the proposed antenna is fabricated and measured. The measured results are in good agreement with simulated ones and the antenna can be applied for the actual wireless communication.