Study of Single-Layer Millimeter-Wave Waweguide Planar Antennas using Dominant Mode

对单层波导缝隙阵进行了功能增强和分析改进的尝试。我们已经研究了通过改变辐射波导中波的传播方向来实现少数光束的方法。确定槽间距，使得波束倾斜角度为波束宽度的一半。我们分别从辐射波导的左右两侧馈电，得到了两个倾斜光束。通过同时从两个光束馈电，我们在光束中获得了多一个光束。在12GHz频段的测量中，我们已经证实，与每侧馈电相比，在两侧馈电中观察到1dB的增益降低。此外，我们还可以在适当的振幅权重下，通过从两侧馈送来扫描光束宽度内的光束。我们研究了在波导两侧加载扼流器的结构，以忽略交流相位馈电天线中开槽板和槽馈电结构之间的所有接触。我们已经确定了深度和位置的宽扼流圈，以减少泄漏损耗的模式匹配的方法。在40GHz频段的分析和测量中，我们都证实了扼流圈负载降低泄漏损耗的效果。通过考虑槽激励周期性的新模型改进了分析。在22GHz的天线中，利用该分析模型，我们得到了35.5dBi，效率为67%的结果。

We have tried the function enhancement and the analysis improvement for single-layer slotted waveguide arrays. We have examined the method for realizing a few beams by switching the direction of the wave propagation in the radiating waveguides. The slot spacing is determined so that the beam is tilted by the angle as a half of the beamwidth. We have obtained two tilted beams by feeding from the left and the right sides of the radiating waveguide separately. We have obtained one more beam in the boresight by feeding from the both simultaneously. We have confirmed in the measurements at 12GHz band that 1dB gain reduction is observed in the feed from the both sides in comparison with the feed from each side. In addition, we can have scanned the beam within as the beam width by feeding from the both sides at appropriate amplitude weight. We have investigated the structure which loads both sidewalls of the waveguide with chokes in order to neglect all the contacts between the slotted plate and the groove feed structure in the alternating-phase feed antennas. We have determined the depth and the position for a wide choke to minimize leakage loss by the mode-matching method. We have confirmed the effect of decreasing leakage loss by the choke loading both in the analysis and the measurements at 40GHz band. The analysis has been improved by a new model considering the periodicity of the slot excitation. We have obtained 35.5dBi with 67% efficiency in a 22GHz antenna using this analysis model.