一种C波段基于发卡结构的低耦合贴片天线

Mutual coupling reduction by using a hairpin based structure for a C band patch antenna pair

在收发天线对中,收发天线单元间的距离越近,单元间的耦合越强。为了抑制近距离放置的2个微带贴片天线单元间的互耦,提出一种占用很小平面空间的对称发卡结构,通过引入新的耦合路径进行天线耦合补偿。基于该结构,设计加工了工作频率在5.8 GHz的微带贴片天线对,尺寸为30 mm×50 mm×1 mm。天线单元边缘间距为0.03λ_0。实验测量结果表明,采用该结构能够使天线对在5.8 GHz实现42 dB隔离度,|S_(11)|<-10 dB带宽为1.21%,带宽内隔离度大于40 dB,证明了该设计的有效性。

In T/R antennas,closely placed antennas always lead to high mutual coupling.In order to restrain the mutual coupling between two closely placed microstrip patch antennas,a vertical wall using compact hairpin structure is proposed,which introduces a new coupling path as coupling compensation.The 30mm×50mm×1mm patch antenna pairs are designed,which work at 5.8 GHz,and the edge-to-edge distance is 0.03λ0.λ0 is the wavelength in free space.The experimental results verify that the antenna pair can achieve 42 dB isolation at 5.8 GHz,the bandwidth of|S11|<−10 dB is 1.21%,and the isolation within the bandwidth is more than 40 dB,which proves effectiveness of the design.