1420MHz PCB Yagi Antenna-New

S11 parameters of the antenna: Generally required to be less than -10dB in the working frequency band.

The resonance point of the antenna: the minimum value of the S11 curve within the operating frequency.

Target antenna (Figure 1 below): 1420MHz resonance, S11 parameters

Figure 1: The front and back sides of the Yagi antenna

S11 parameters of antenna

The red curve is the simulated S11 parameter, and the yellow and green curves are the two measured S11 parameters. It can be seen that the antenna can work normally around 1420MHz, with a bandwidth of about 50-70MHz.

Figure 2: S11 parameters

Figure 3 shows the scene during the two measurements. The equipment used was NanoVNA. The left picture corresponds to the green curve in Figure 2, and the right picture corresponds to the yellow curve in Figure 3.

Figure 3: The scene of two measurements

radiation pattern

Figure 4 shows the simulated direction diagrams of the E and H surfaces. It can be seen that the gain is 8dBi.

Figure 4: Orientation diagram of E side and H side

SMA interface

You can use the SMA angle connector from Jialichuang Mall, as shown in Figure 5. Of course, you can also buy it on your daily shopping software. Or adjust the soldering pad yourself and use other SMA connectors.

Figure 5: Off-leg SMA connector