针对传统的八端口双平面和差网络存在对交叉差端口的问题，文中提出了一种新型的七端口双平面和差网络结构。该网络由三个平面魔T和一个Wilkinson功分器组成，运用微波网络理论，推导了该网络的S参数矩阵，从理论上证明了网络结构设计的正确性。基于该网络结构，采用三枝节分支线耦合器、宽带90°移相器和Wilkinson功分器构建了一种七端口宽带双平面和差网络，测试结果表明：该网络在2.22 GHz~3.90 GHz的频段内，具有良好的传输、隔离以及和差运算特性。该网络结构避免了交叉差端口，具有结构简单、制作成本低等优点，可以在双平面单脉冲天线系统中得到广泛应用。

A novel dual-axis sum-and-difference network structure with seven ports is proposed in this paper in due to the cross-difference port of the traditional eight-port network. The proposed network structure is composed of three planar magic-T and one Wilkinson divider. The S parameter matrix is concluded to verify the validity. Based on the structured consider here, A novel wideband sum-and-difference network using the three-branch coupler, wideband 90° phase shifters and one Wilkinson divider has been constructed. The measured results have demonstrated that the network can exhibit excellent transmission, isolation and sum-difference performances during the band from 2.22 GHz to 3.9 GHz. The network has the advantage of simple structure and low product cost. Therefore, the network structure can be widely applied in the dual-axis mono-pulse antenna systems.

TN959.71

国家自然科学基金资助项目