一种超宽带异向介质共面波导馈天线

基于裂缝谐振环的降频技术,利用色散性稳定、频带宽、电尺寸小的异向介质结构,设计了一种加载异向介质的新型平面波导馈天线（CPW-fed antenna）,实现了天线的宽带小型化。修正的PIFA传输线模型中,利用异向介质的谐振电路取代了传统辐射贴片不连续性而引起的电容效应。仿真和实测数据表明,该天线-10 dB相对带宽超过了80%,物理尺寸也缩减了近一倍,其谐振频段3.5～8.3 GHz内得到全向的辐射方向图。

Ultra Wideband Metamaterial CPW-fed Antenna

Based on the technique of reducing working frequency of split ring resonators （SRR）, and a left-handed medium structure with smooth dispersion, broadband property and small dimensions, a novel CPW-fed antenna loaded with a metamaterial is designed for the broadband and miniaturization. In the modified CPW-fed antenna transmission line model, the conventional capacitance which causes the capacitance effect by its discontinuity is replaced by the resonance circuit of the metama- terial. Both the simulated and measured results demonstrate that such metamaterial CPW-fed antenna exhibits a -10 dB return loss of more than 80% bandwidth, and also the physical dimensions have been reduced by nearly 50%. Nearly omnidirectional radiation pattern is achieved in the resonance oscillation frequency range of 3.5-8.3 GHz.