缝隙阵辅助7.2.3 Waveguide slot array design A sketch of a waveguide slot antenna with the pertinent dimensions is shown in Figure 7-5. The first design consideration is that the slots be resonant so that they provide a resistive load to the (waveguide) transmission line. Normally, it is desirable for an omnidirectional antenna to radiate in a horizontal (azimuth) plane. This is achieved by feeding all the slots in phase. The radiation pattern may be tilted upward or downward (visualize a shallow cone) by changing the phasing of the slots, if desired. I’m told that vertical collinear arrays for ground-based aviation antennas are sometimes designed with a pattern tilted upward. The slots are fed in phase by spacing their centers at electrical half-wavelength intervals along the waveguide. The electr……