文中研制了一种X 波段改进型分支线式宽带带线和差器,该分支线式的和差器是由多段四分之一波长线组成的多环魔T,且各四分之一波长段的长度、线宽可调节。通过理论分析和三维电磁仿真优化四分之一波长参数及环路级数,得到了X 波段40??频带内幅度一致性优于±0. 15 dB,相位一致性优于±1. 5°,和差隔离度优于33 dB 的和差器。并通过实物验证得到和差器在同频带内幅度一致性优于±0. 2 dB,相位一致性优于±2°,和差隔离度优于27. 5 dB。最后结合工程应用,通过理论分析、三维电磁仿真构建了平面式宽带和差波束形成网络,得到X 波段40??频带内和、方位差、俯仰差波束幅度一致性优于±0. 3 dB,相位一致性优于±2. 5°,和、方位差、俯仰差之间隔离度优于34 dB。

A wideband sum-and-difference network based on improved hybrid-ring stripline is proposed in this paper. This sum-and-difference network is a kind of multi-loop magic T and is composed of several quarter-wavelength striplines which length width can be changed. The proposed sum-and-difference network′s bandwidth and uniformity of amplitude and phase can be optimized by adjusting the quarter-wavelength′s characteristic and number of loops. A prototype of sum-and-difference network with 40?? bandwidth is designed by theoretical analysis and 3D EM simulation. A good result is get that uniformity of amplitude is better than 0. 3 dB and the uniformity of phase is better than 3° and the isolation is better than 33 dB. Meanwhile a test physical is made to get a good result that uniformity of amplitude is better than 0. 4 dB and the uniformity of phase is better than 4° and the isolation is better than 27. 5 dB which verified the proposed sum-and-difference network. At last, theoretical analysis and 3D EM simulation are done to get a wideband sum-and-difference beamforming network with 4 0 ?? bandwidth is designed, and the uniformity of amplitude is better than 0. 6 dB, the uniformity of phase is better than 5°, the isolation is better than 34 dB.

TN958.92