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    Yagi-Uda Array

    Updated

    After learning how to simulate a Cylindrical Antenna >, we are ready to build a dipole array. A 3-element Yagi-Uda antenna, consisting of a reflector, a driven element, and a director, is shown in Fig. 1, where the coordinates of the wire ends are indicated in meters.

    Fig. 1: Geometry definition for the Yagi-Uda array. The coordinates are in meters.
    Step 1 | Setup

    Go to the Setup tabsheet and set an operating frequency of 300 MHz in the Frequency panel. None must be selected in Environment panel > Ground Plane box and Discrete Sources in the Excitation panel.

    Step 2 | Draw

    Follow the procedure described in Cylindrical Antenna > to draw one wire at a time. Set the coordinates of the ends of the wires indicated in Fig. 1. Set 15 segments for each wire and a radius of 5 mm. Then, right click on the driven element, select the Source/Load command, and connect a voltage source at the middle segment. Refer to Adding Sources >.

    Step 3 | Run

    Click on the Run Currents and Far-Field (F11) button on the toolbar. Fig. 2 shows the table in the Results tabsheet, where a peak gain of 8.9 dBi is obtained. This can also be seen in the gain pattern of the Yagi-Uda array shown in Fig. 3. Click on the Far-Field 3D Plot button on the toolbar to plot the 3D radiation pattern.

    Fig. 2: Results tabsheet, where a peak gain of 8.9 dBi is obtained for the Yagi-Uda array.
    Fig. 3: Gain pattern [dBi] for the Yagi-Uda array of Fig. 1 at 300 MHz.
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