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SWR (Standing Wave Ratio) is a parameter used in radio engineering and communications to evaluate the matching of antennas and feeder lines. It characterizes the degree of signal reflection from the load (e.g., antenna) back to the source (transmitter).
The ideal SWR value is 1, indicating perfect matching (no reflection). Higher SWR values indicate the presence of reflections, which can lead to power loss and degraded communication quality.
The maximum SWR value is theoretically infinite. This occurs when the load completely reflects all the transmitted power. In real-world practice, SWR values rarely exceed several tens, as such high values indicate extremely poor matching and significant power loss.
To summarize:
Minimum SWR value: 1 (perfect match).
Maximum SWR value: theoretically infinite (total reflection).