== Using a Directional Yagi-Uda Array ==
A vertical dipole has a fairly omni-directional far-field radiation pattern along the azimuth direction. Next, we will use a directional antenna array as the transmitter. For this purpose, we choose a horizontal end-fire Yagi-Uda dipole array with a reflector, an exciter and 10 director elements. The individual dipole elements are Y-directed and the array's linear axis is oriented along the X-axis. The design of the Yagi-Uda dipole array is discussed in detail in [[EM.Libera Tutorial Lesson 2: Designing A Yagi-Uda Dipole Array]]. The figure below shoes shows the 3D far-field radiation pattern of 12-element Yagi-Uda array at an operating frequency of 2.4GHz.
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The above radiation pattern was computed using [[EM.Libera]], [[EM.Cube]]'s MoM3D computational module. The φ and θ components of the far-zone electric fields in the standard spherical coordinate system are stored in an ASCII data file with a ".RAD" file extension. With an original angular resolution of 1°, the data file contains a total of 361 × 181 = 65,341 rows containing the real and imaginary parts of the complex-valued E<sub>θ</sub> and E<sub>φ</sub> field components.
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