# In chapter 4 of the text we will see that the gross

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z x y θ φ Figure 1.3: Elemental dipole radiation pattern. (left) E-plane. (right) H-plane. The overall pattern is a torus. The dipole is aligned parallel to the z axis. (A dipole does not radiate off its ends, which we shall see later.) ones are called sidelobes. If there are several main lobes, they are referred to as grating lobes. The nomenclature can be ambiguous and subjective. In this example, there is essentially a single lobe at the equator ( θ = π/ 2 ) that wraps around all azimuths φ . Several measures of the width of the lobes in the patterns are in common use. These include the half-power full beamwidth (HPFB or HPBW), which gives the range of angles through which the radiation pattern is at least half its maximum value in some plane. Engineers often refer to the E- and H-planes, which are orthogonal planes tangential to the electric and magnetic lines of force, respectively. In this example, the E- and H-planes are shown at left and right, and the HPFB in the E-plane is 90 . Since the radiation is uniform in the H-plane here, the HPBW is not defined
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• Spring '13
• HYSELL
• The Land, power density, Solid angle

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