共用口径双波段双极化微带天线阵的设计

介绍一种新的共用口径双波段双极化（DBDP）微带天线阵的设计.天线工作于S波段和X波段，采用双线性极化，适用于机载或舰载的合成孔径雷达（SAR）.为了满足高低波段的带宽要求，天线采用双层贴片形式，解决以往DBDP天线在低波段难以满足带宽要求的问题.在低波段采用微带振子天线，放置在高波段矩形微带天线的阵列间隙处，使低波段天线对高波段天线的影响降至最小，并由于利用了垂直放置的双极化微带振子作为低波段辐射单元，可以使双波段阵列适用于更广泛的双频比.在馈电方式上，采用外置功分器的形式，低波段采用邻 近耦合馈电，高波段采用同轴探针馈电.对天线进行了仿真、加工和测试，实验结果验证了 本设计的有效性.

Design of a Shared-Aperture Dual-Band Dual-Polarized Microstrip Antenna Array

A new design of the shared-aperture dual-band dual-polarized(DBDP) microstrip antenna array is introduced.The antenna operates in S-band and X-band with dual-linear polarization,suitable for airborne and shipborne synthetic aperture radar(SAR) applications.To meet the bandwidth requirements in both bands,a stacked patch configuration is used.This overcomes the difficulty of the previous DBDP antennas in obtaining large bandwidth in the lower band.Furthermore,to minimize the influence on the higher band,microstrip dipoles are used in the lower band,located in the spaces among X-band patches.By using orthogonal dual-polarized microstrip dipoles as the lower band radiation elements,the dualband array can be applied for a wider range of frequency ratio.The microstrip power combiner is not integrated in the array.The lower and higher bands use proximity coupled feed and probe feed respectively.The array was simulated,fabricated and measured.Experimental results have verified feasibility of the proposed array.