होम> ब्लॉग> [Photo] Antenna standing wave ratio measurement method

[Photo] Antenna standing wave ratio measurement method

September 09, 2023

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In an antenna system, whether the antenna is well-connected to the device is usually measured by a parameter called standing wave ratio. When the standing wave ratio is 1, it means that the antenna system is well-matched without reflection. This means that the worse the matching condition, the greater the reflected wave in the system. So how do you measure the VSWR of the antenna? Here I will introduce a simpler method to you.
To measure the standing wave ratio, a frequency sweeper is needed. The connection method is shown in Figure 2-1. First, short-circuit the terminal of the feeder (near the antenna system). At this time, the signal output by the frequency sweeper forms a total reflection at the terminal of the feeder. Observe the total reflection waveform as shown in Figure 2-2. The maximum amplitude of the curve is a, and then connect the antenna to the terminal of the feeder. At this time, the maximum amplitude observed on the frequency scanner within the operating frequency range is b. As shown in Figure 2-3, First find the reflection coefficient P = b / a, then use the formula S = 1 + P / 1-P to find the standing wave ratio, where S represents the standing wave ratio.

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