Figure 7 - uploaded by Sherif Sedky
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... excitation of this mode is via port 2. In this case, the ring coupler delivers half of the input power to each antenna side with the same phase. A negligible amount of power can couple to port 1. The surface current distribution of the monopole mode on the antenna arms at 77 GHz is plotted in Fig. 7. It can be seen that the horizontal currents are opposite to each other, which results in relatively weak radiation from them. On the other hand, the vertical currents are in the same direction. In this mode of operation, the image method should be applied twice. First, we ...
