Investigation on wide-angle scanning technology for high power resonant waveguide slot array antenna
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摘要: 在传统高功率缝隙波导阵列中，缝隙间的相互耦合严重影响了阵列的宽角扫描能力。以实现阵列宽角波束扫描为目标，通过分析阵列扫描特性，从提高缝隙阵元间隔离度的角度出发，提出在阵列中引入隔离栅结构，降低了阵元间耦合对阵列大角度扫描时的影响。在此基础上，设计了基于波导窄边斜缝的谐振式阵列天线，采用电磁仿真软件优化阵列。数值模拟结果表明，未采取措施前阵列的最大扫描范围为±34°，引入隔离栅后扫描范围可扩大至±45°，波导端口S11≤−10 dB，增益仅下降了2.3 dB，单根缝隙波导功率容量达330 MW，有应用于高功率微波领域的潜质。Abstract: In traditional high-power slotted waveguide arrays, the mutual coupling between the adjacent slots seriously affects the wide-angle scanning ability of the array. To improve beam scanning ability, the scanning characteristics of the array has been analyzed. An isolation barrier has been introduced into the traditional slotted waveguide array to suppress the cross polarization caused by the inclined slots and improve the isolation of the elements. In this paper, an antenna array based on the rectangular waveguide with resonant slot in the narrow-wall has been proposed and designed, the simulation results show that the traditional structure can only scan to ±34° when S11≤−10 dB. But after loading the isolation barrier, the scanning range is expanded to ±45° with 2.3 dB gain reduction. Moreover, the power handling capacity of a single slotted waveguide is more than 330 MW, which indicates application potentials of this antenna in high power microwave (HPM) field.
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