基于多路去耦网络的对跖Vivaldi天线阵解耦

Decoupling of Antipodal Vivaldi Antenna Array Based on Multi-route Decoupling Network

该文提出一种基于多路去耦网络解耦宽带天线阵的设计方法。首先,通过节点分析法推导通用多路去耦网络模型的解耦条件和阻抗匹配条件,形成一般设计方法。其次,将多路去耦网络应用至2元对跖Vivaldi天线阵,以低频段为设计基点,依据设计原理得到多路去耦网络的结构参数,增加渐变传输线拓展去耦带宽。实测结果表明,阵列在3.34~13 GHz(3.89:1)的工作频段内隔离度均高于20 dB,与耦合阵相比隔离带宽增加58.8%,且辐射性能得到改善。最后,在1维8元阵列中验证多路去耦网络的有效性,阵列在带内隔离度均高于20 dB,且在±60°的扫描范围内具有良好的辐射性能。所设计的多路去耦网络具有通用性、结构简单和宽带解耦能力,在相控阵天线和大规模通信系统中具有极大的应用前景。

In this paper,one design method of decoupling wideband antenna array based on multi-route decoupling network is proposed.At the beginning,the decoupling and matching conditions of the common multi-route decoupling network model are derived by employing node analysis,and the general design process is obtained.Then,the proposed decoupling network is applied to a two-element antipodal Vivaldi array,and its dimensional parameters are achieved via the designing basis at low band and the design process.Also,gradient transmission lines are added to extend the decoupling bandwidth.The measured results indicate that the isolation is higher than 20 dB in the operation band of 3.34~13 GHz(3.89:1),which is 58.8%wider than that of the coupled array.Finally,the decoupling effectiveness is further verified in one-dimensional eight-element array,and in-band isolation is always higher than 20 dB.Moreover,the array owns good radiation performance in the scanning range of±60°.The presented multi-route decoupling network features generality,simple structure and wideband decoupling performance,and is potential in the application of phased arrays and largescale communication systems.