name: VSWR
full_form: VoltageÂ Standing Wave Ratio
context: In the following, a practical version of the Free Space VSWR method is presented. In the Free Space VSWR method the quality of quite zone is measured from amplitude ripple caused by reflections inside the anechoic chamber. Phase variation of the direct signal and the reflected signals is obtained by moving a field-probe in the quiet zone. Amplitude ripple in the quiet zone is caused by this phase variation of reflected signals and the direct signal from antenna. The figure 2 below shows seven measuring positions. Figure G.2: Measurement positions with 150mm separation In each of the seven-measurement position amplitude of power received by field-probe [dBm] is measured where is index of measuring position. Variance of measurement distance to the antenna from field-probe in different measurement positions can be compensated by following equation: where, is distance to point from the antenna, is distance to centre of quiet zone from the antenna is uncorrected measurement value from point
description: Voltage Standing Wave Ratio (VSWR) quantifies the amount of signal reflection in a transmission line or waveguide. It's crucial for characterizing quiet zone quality, like those in anechoic chambers.
explanation: The text describes VSWR as a method to measure the quality of a quiet zone by analyzing amplitude ripple caused by reflections within an anechoic chamber. This indicates VSWR is used as a metric for measurement.
section_title: G.2.1Description of a practical method for Quiet Zone characterization
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