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By Birkhoff G.D.

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C) 3l/4. (d) l. 4 280 (c) FIGURE 2-12 (d) l. 2 270 330 (d) 280 290 300 310 Frequency [MHz] 320 330 Gain as a function of frequency for finite length dipole antennas: (a) l/4. (b) l/2. (c) 3l/4. The antenna gain as a function of frequency is given in Figure 2-12. The antenna gain increases with frequency, which is due to the larger electrical size of the dipole. In addition, while all designs show an increase in gain as a function of frequency, this variation in gain increases for larger dipoles.

While a null is still seen in the broadside direction, several other nulls seem to appear along other elevation angles. The presence of these nulls is attributed to the existence of the image source here [7]. Note that if the vertical distance of the dipole to the ground plane changes, the position of these nulls will change; however, the broadside null will always be present in this case. Next we study the horizontal dipole case. The elevation plane radiation pattern is given in Figure 2-27 for two plane cuts: the x-z and y-z planes.

1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 41 43 53 60 68 71 INTRODUCTION This chapter introduces another fundamental antenna configuration: the loop antenna. This simple, inexpensive, and very versatile antenna takes many different forms, such as a rectangle, square, triangle, ellipse, and circle.

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A Theory of Matter and Electricity by Birkhoff G.D.


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