CHAPTER 12The Yagi-Uda Beam Antenna
As we have discussed in the past few chapters, antenna arrays deliver an increased signal to or from one or more favored directions at the expense of signal in other directions. We have seen examples of both all-driven (or driven) arrays and parasitic arrays. In the latter, one or more elements of the array are not directly connected to the feedline; instead, they cause RF energy to be redirected through careful choice of certain of their characteristics—in particular, their length relative to a half-wavelength at the operating frequency and the spacing between them and adjacent elements of the array.
Arguably the most popular parasitic array in common use today is the Yagi-Uda beam antenna or, more commonly, ...
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