By Azaroff L. V.

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The antenna gain and |S11| as a function of frequency are given in Figure 2-39. 9919 MHz –2 –3 –4 –5 –6 –7 250 340 350 FIGURE 2-39 ¢ (a) Reflection coefficient of a quasi log-periodic dipole antenna as a function of frequency. (b) Antenna gain as a function of frequency. –3 –18 250 330 Impedance as a function of frequency: (a) Conventional dipole. (b) Quasi log-periodic dipole. 0 Z Y X Y X Z Z (a) X Z (b) Y FIGURE 2-40 ¢ Y X Radiation pattern at 300 MHz: (a) Dipole. (b) Quasi log-periodic dipole.

B) 2D patterns at three frequencies. high frequency (UHF) monopole antenna with a length of l/4. To simulate the ground plane for the monopole, in the solution tab, select ‘‘infinite plane/ground’’ options and ‘‘infinite PEC ground’’ at z ¼ 0. When the infinite ground option is selected, the pattern can be computed only in the top hemisphere. Thus, for the 3D far-field request, set q to be from 0 to 90. The radiation pattern of this quarter-wavelength monopole antenna is given in Figure 2-15.

The current distribution on the sphere is shown in Figure 2-32. Note the difference in computational time for these two cases. The radiation pattern of the dipole antenna will be distorted. The radiation pattern of the antenna is shown in Figure 2-33. It is also interesting to compare the gain values of the dipole antennas when they are placed close to these obstacles. In the configurations studied in these sections, the maximum dipole gain is obtained with the horizontal dipole when it is placed above an infinite PEC ground.