How do We Control the Surface Waves

The encouraging conclusion is of course that even if the surface waves might actually be stronger than the Hoquet currents (see, for example. Fig. 1.3c), they apparently radiate less efficiently than the Hoquet currents. These facts will be discussed in detail in Chapter 4. 

32 Variation of the Scan Impedance from Column to Column 

Obviously it would be too much of a challenge to match an impedance with precision to the fluctuating scan impedance of Fig. 1.3c—in particular, when we realize that the maximum and minimum will start moving around with scan angle and frequency. Thus, we must simply look for ways to get rid of the surface waves or at least reduce them. We will discuss these matters next and in more detail in Chapter 4. 

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