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

我们尝试了对单层开槽波导阵列进行功能增强和分析改进。我们研究了通过改变辐射波导中波的传播方向来实现几束光的方法。确定狭缝间距，使光束以波束宽度的一半的角度倾斜。我们分别从辐射波导的左右两侧馈电，得到了两束倾斜光束。我们通过同时从两个光束中获得多一束光束。我们已经在12GHz频段的测量中证实，与每侧馈电相比，两侧馈电的增益降低了1dB。此外，我们可以通过在适当的振幅权重下从两侧馈电来扫描光束的宽度。为了忽略交变相位馈电天线中槽板和沟槽馈电结构之间的所有接触，我们研究了在波导两侧都施加扼流圈的结构。通过模式匹配的方法，确定了宽扼流圈的深度和位置，使漏损最小。在40GHz频段的分析和测量中，我们都证实了扼流圈负载对降低泄漏损耗的作用。考虑槽激励的周期性，提出了一种新的模型，对分析进行了改进。我们使用该分析模型在22GHz天线中获得了35.5dBi，效率为67%。

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.