改进共面波导馈电的双频单极子天线设计

介绍一种具有全向性的印刷单极子天线。该天线由简单的平面单极子和共面波导（CPW）组成。通过改变共面波导的特性阻抗,可以使共面波导成为第二个独立辐射设备从而使得该单频结构天线产生双频性能。仿真及其实验结果表明,该结构可以获得很大自由度的双频性能（包括WLAN等）。还可以将两个频段融合实现宽带性能,并获得大于66%的相对带宽（VSWR〈2）。

Modified CPW-fed Monopole Antenna for Dual-band Application

A simple planar CPW-fed monopole antenna is described. The proposed antenna,though its structure is simple and seemingly the same as most ordinary monopole,is able to realize dual frequency functions by introduction of CPW slot as the another radiator. Simulation and measured results show that,through modifying the parameters of the feed part and stub,each part could produce a relatively isolated frequency. Thus,the whole design is able to produce dual frequencies （including WLAN and ITS operations） or realize wideband（by merging the two frequencies together）,and achieve a relative bandwidth of over 66%.