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本文提出并设计制作了一种新型的全口径高隔离度双极化单脉冲阵列天线。该阵列天线单元采用微带贴片与喇叭复合的形式,将微带贴片作为喇叭的二次激励源,以获得更高的单元增益。其中的微带贴片采用一对相互垂直的带状线通过两个呈“T”型分布的“H”形缝隙耦合馈电,以获得较高的极化隔离度(在工作频带内小于-35dB)。在阵列馈电设计中采用二次错位倒相技术,进一步改善了极化隔离度和交叉极化。仿真和实测结果表明,在f0±200MHz内,驻波比小于2,垂直极化增益大于27dB,水平极化增益大于27.5dB,端口极化隔离度小于-40dB,和差端口隔离度小于-28dB。
This paper presents and designs a new type of full aperture high isolation dual polarization single pulse array antenna. The array antenna unit adopts the combination of the microstrip patch and the horn, and the microstrip patch is used as the secondary excitation source of the loudspeaker to obtain a higher cell gain. The microstrip patch uses a pair of mutually perpendicular striplines to be fed through two “H” -shaped gap-shaped distributions with “T” shape for higher polarization isolation (at work Less than -35dB in the band). In the array feed design quadratic dislocation phase inversion technology to further improve the polarization isolation and cross polarization. Simulation and experimental results show that the VSWR is less than 2, the vertical polarization gain is more than 27dB, the horizontal polarization gain is more than 27.5dB, the port polarization isolation is less than -40dB and the poor port isolation is less than -28dB within f0 ± 200MHz .