共面波导差分馈电频率可重构天线

A CPW differentially-fed frequency reconfigurable antenna

提出了一种共面波导(coplanar waveguide,CPW)差分馈电频率可重构天线.通过直流偏置电路来控制天线上四个PIN二极管的导通和断开模式,天线可以工作在两种状态,实现在2.02~2.89GHz和3.27~3.66GHz两个频段的重构,阻抗带宽分别为35.4%和11.3%,且天线辐射方向图受频率可重构的影响较小,天线在两种状态下的平均增益分别可达3.18dBi和3.61dBi.该天线充分利用共面波导天线结构简单和频带宽的优势,实现了差分馈电技术与频率可重构技术的完美结合.天线的实测结果与仿真结果非常接近,可应用于WLAN的2.45GHz和WiMAX的2.45GHz、3.5GHz两个频段.

A coplanar waveguide（CPW） differentially-fed frequency reconfigurable antenna is proposed. By designing a DC bias circuit to change the working states of the four PIN diodes, the differentially-fed frequency reconfigurable antenna can be reconfigured in two frequency bands, 2.02 to 2.89 GHz （35.4%） and 3.27 to 3.66 GHz （11.3%）, and the performance of frequency reconfiguration barely has influence on the radiation patterns of the antenna, the average gain of the two states can achieve 3.18 dBi and 3.61 dBi, respectively. This antenna which combines the differential technology and frequency reconfigurable technology, has a compact CPW structure and uses wide bands, thus can be applied to the 2.45 GHz band of WLAN and two bands of WiMAX, 2.45 GHz and 3.50 GHz.