name: VSWR
full_form: Voltage Standing Wave Ratio
context: PC3 REFSENS can be met in PC1 operation. As can be seen from Fig 6.3-1 band 20 ranks the most difficult and as mentioned earlier there is REFSENS exception specified due to this. Easiest is the band 5 in this context and given that band 14 does not have specified exception it is clear that band 5 does not need it either. From Fig 6.3-1 ranking and FOM perspective there is a need to study if band n71 needs REFSENS exception due to PC1 operation. Bands 28 and n71 are both based on dual duplexer architecture and band 28 does not have exception but FOM is on the other hand lower 0.6 compared to 0.8 for n71. Then when studying the band 12 it can be seen that the FOM is 0.5 which is same as band 14 which does not have REFSENS exception specified however band 14 has seven MHz wider duplex-gap which helps filters to reach adequate attenuation. Current PC1 band 28 does not have exception and it has higher FOM of 0.6 compared to band 12. One thing that helps band 28 is that specification
description: Voltage Standing Wave Ratio (VSWR) is a measure used in the Free Space VSWR method for characterizing the quality of the quiet zone in an anechoic chamber. It assesses the amplitude ripple caused by reflections inside the chamber, which is influenced by phase variations of direct and reflected signals from the antenna. The measurement involves moving a field-probe within the quiet zone to obtain power received values at different positions, compensating for variance in measurement distances using specific equations.
explanation: VSWR is defined as a metric used to quantify the quality of an anechoic chamber's quiet zone based on signal reflections and phase variations. This aligns with the definition of Measurement as a quantifiable assessment of a characteristic or performance.
section_title: F.2.1	Description of a practical method for Quiet Zone characterization
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