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摘要: 波导间缝隙的互耦会严重降低高功率微波宽边纵缝波导缝隙阵的宽角扫描能力。设计了一L波段高功率宽边纵缝波导缝隙阵，在阵列波导间设计扼流槽结构抑制缝隙互耦。数值模拟结果表明，没有扼流槽结构的阵列波束扫描增益下降3 dB的角度为24.7°，具有扼流结构的阵列扫描增益下降3 dB的角度为33°。同时扼流结构还可以明显改善阵列的有源反射系数，有扼流结构的阵列有源VSWR≤3的带宽为6.6%，而没有扼流结构的阵列有源VSWR≤3的带宽为5.0%。数值模拟结果还表明，波束扫描时(扫描角35°)，阵列功率容量可达到957 MW, 比阵列无波束扫描时(1.008 GW)稍低一点。Abstract: In conventional High Power Microwave(HPM) waveguide arrays of longitudinal shunt slots, the mutual coupling of slots in different waveguide can badly decrease the capability of wide-angle scanning of array. For this reason, an L-band HPM waveguide array of longitudinal shunt slots was designed. The choke groove was adopted to restrain the mutual coupling of slots of the HPM array antenna. The results of simulation are: the scanning angle of array without choke groove structure with the gain of antenna decreased 3 dB is only 24.7°, and it is 33.0° for array with choke groove structure; the wideband of active reflection of array have been improved with choke groove structure, the bandwidth of VSWR ≤3 of array with choke groove is 6.6%, and that is 5.0% without choke groove; the power-handling capacity of array antenna with scanning angle of 35° can reach 957 MW, which is a little less than that of array without scanning(1008 MW).
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Key words:
- high power microwave /
- waveguide slot array /
- wide angle scanning /
- choke groove /
- dielectric window
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Figure 10. Pattern of array with horn cavity structure (without choke groove) at scanning angle of 35°
Figure 14. E-field distribution of window in atmosphere side with scanning angle of 35°
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